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WAN PLL WITH DUAL REFERENCE INPUTS FEATURES
* Supports AT&T TR62411 and Telcordia GR-1244-CORE Stratum 3, Stratum 4 Enhanced and Stratum 4 timing for DS1 interfaces * Supports ITU-T G.813 Option 1 clocks for 2048 kbit/s interfaces * Supports ITU-T G.812 Type IV clocks for 1544 kbit/s interface and 2048 kbit/s interfaces * Supports ETSI ETS 300 011, TBR 4, TBR 12 and TBR 13 timing for E1 interface * Selectable input reference signal: 8 kHz, 1.544 MHz or 2.048 MHz * Accepts reference inputs from two independent sources * Provides eight types of clock signals: C1.5o, C3o, C2o, C4o, C6o, C8o, C16o and C32o * Provides six types of 8 kHz framing pulses: F0o, F8o, F16o, F32o, RSP and TSP * * * * * * * * * * * * * *
IDT82V3002A
Holdover frequency accuracy of 0.025 ppm Phase slope of 5 ns/125 s Attenuates wander from 2.1 Hz Fast Lock mode Provides Time Interval Error (TIE) correction MTIE of 600 ns JTAG boundary scan Holdover status indication Freerun status indication Normal status indication Lock status indication Input primary reference quality indication 3.3 V operation with 5 V tolerant I/O Package available: 56-pin SSOP
DESCRIPTION
The IDT82V3002A is a WAN PLL with dual reference inputs. It contains a Digital Phase-Locked Loop (DPLL), which generates ST-BUS clocks and framing signals that are phase locked to a 2.048 MHz, 1.544 MHz or 8 kHz input reference. The IDT82V3002A provides eight types of clock signals (C1.5o, C3o, C6o, C2o, C4o, C8o, C16o, C32o) and six types of framing signals (F0o, F8o, F16o, F32o, RSP, TSP) for the multitrunk T1 and E1 primary rate transmission links. The IDT82V3002A is compliant with AT&T TR62411, Telcordia GR1244-CORE Stratum 3, Stratum 4 Enhanced and Stratum 4, ETSI ETS 300 011, ITU-T G.813 Option 1 for 2048 kbit/s interface, and ITU-T G.812 Type IV clocks for 1544 kbit/s interface and 2048 kbit/s interface. It meets the jitter/wander tolerance, jitter/wander transfer, intrinsic jitter/wander, frequency accuracy, capture range, phase change slope, holdover frequency accuracy and MTIE (Maximum Time Interval Error) requirements for these specifications. The IDT82V3002A can be used in synchronization and timing control for T1 and E1 systems, or used as ST-BUS clock and frame pulse sources. It can also be used in access switch, access routers, ATM edge switches, wireless base station controllers, or IADs (Integrated Access Devices), PBXs and line cards.
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
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2003 Integrated Device Technology, Inc.
OCTOBER 22, 2003
DSC-6243/2
IDT82V3002A WAN PLL WITH DUAL REFERENCE INPUTS
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FUNCTIONAL BLOCK DIAGRAM
OSCi OSCo TCLR VDD VSS VDD VSS VDD VSS VDD VSS
OSC Fref0 Fref1 IN_sel FLOCK MON_out Reference Input Monitor Reference Input Switch
C32o
TIE Control Block
Virtual Reference
DPLL
C16o C8o C4o C2o C3o C1.5o C6o F0o F8o F16o F32o RSP TSP LOCK
RST
Invalid Input Signal Detection
Feedback Signal
TDI TMS TRST JTAG
State Control Circuit
Frequency Select Circuit
TCK TDO TIE_en MODE_sel1 MODE_sel0 NORMAL HOLDOVER FREERUN
F_sel1
F_sel0
Figure - 1 Block Diagram
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TABLE OF CONTENTS
1 2 3 IDT82V3002A PIN CONFIGURATION........................................................................................................................... 6 PIN DESCRIPTION ........................................................................................................................................................ 7 FUNCTIONAL DESCRIPTION..................................................................................................................................... 10 3.1 State Control Circuit............................................................................................................................................. 10 3.1.1 Normal Mode ............................................................................................................................................11 3.1.2 Fast Lock Mode ........................................................................................................................................ 11 3.1.3 Holdover Mode ......................................................................................................................................... 11 3.1.4 Freerun Mode ........................................................................................................................................... 12 3.2 Frequency Select Circuit...................................................................................................................................... 12 3.3 Reference Input Switch........................................................................................................................................ 12 3.4 Reference Input Monitor ...................................................................................................................................... 12 3.5 Invalid Input Signal Detection .............................................................................................................................. 12 3.6 TIE Control Block................................................................................................................................................. 12 3.7 DPLL Block .......................................................................................................................................................... 14 3.7.1 Phase Detector (PHD) .............................................................................................................................. 15 3.7.2 Limiter ....................................................................................................................................................... 15 3.7.3 Loop Filter................................................................................................................................................. 15 3.7.4 Fraction Block ........................................................................................................................................... 15 3.7.5 Digital Control Oscillator (DCO)................................................................................................................ 15 3.7.6 Lock Indicator ........................................................................................................................................... 16 3.7.7 Output Interface ........................................................................................................................................ 16 3.8 OSC ..................................................................................................................................................................... 16 3.8.1 Clock Oscillator......................................................................................................................................... 16 3.9 JTAG.................................................................................................................................................................... 16 3.10 Reset Circuit ........................................................................................................................................................ 16 MEASURES OF PERFORMANCE .............................................................................................................................. 17 4.1 Intrinsic Jitter........................................................................................................................................................ 17 4.2 Jitter Tolerance .................................................................................................................................................... 17 4.3 Jitter Transfer....................................................................................................................................................... 17 4.4 Frequency Accuracy ............................................................................................................................................17 4.5 Holdover Accuracy............................................................................................................................................... 17 4.6 Capture Range .................................................................................................................................................... 17 4.7 Lock Range.......................................................................................................................................................... 17 4.8 Phase Slope ........................................................................................................................................................ 17 4.9 Time Interval Error (TIE) ...................................................................................................................................... 17 4.10 Maximum Time Interval Error (MTIE) .................................................................................................................. 17 4.11 Phase Continuity.................................................................................................................................................. 18 4.12 Phase Lock Time ................................................................................................................................................. 18 TEST SPECIFICATIONS ............................................................................................................................................. 19 5.1 AC Electrical Characteristics ............................................................................................................................... 20 TIMING CHARACTERISTICS...................................................................................................................................... 24 ORDERING INFORMATION ........................................................................................................................................ 28
4
5 6 7
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IDT82V3002A WAN PLL WITH DUAL REFERENCE INPUTS
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LIST OF FIGURES
Figure - 1 Figure - 2 Figure - 3 Figure - 4 Figure - 5 Figure - 6 Figure - 7 Figure - 8 Figure - 9 Figure - 10 Figure - 11 Figure - 12 Figure - 13 Figure - 14 Block Diagram .................................................................................................................................................. 2 IDT82V3002A SSOP56 Package Pin Assignment........................................................................................... 6 State Control Block......................................................................................................................................... 10 State Control Diagram.................................................................................................................................... 11 TIE Control Circuit Diagram ........................................................................................................................... 13 Reference Switch with TIE Control Block Enabled......................................................................................... 13 Reference Switch with TIE Control Block Disabled........................................................................................ 14 DPLL Block Diagram ...................................................................................................................................... 15 Clock Oscillator Circuit ................................................................................................................................... 16 Power-Up Reset Circuit.................................................................................................................................. 16 Input to Output Timing (Normal Mode)........................................................................................................... 25 Output Timing 1.............................................................................................................................................. 26 Output Timing 2.............................................................................................................................................. 27 Input Control Setup and Hold Timing ............................................................................................................. 27
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LIST OF TABLES
Table - 1 Table - 2 Table - 3 Table - 4 Table - 5 Table - 6 Table - 7 Table - 8 Table - 9 Table - 10 Table - 11 Table - 12 Table - 13 Table - 14 Table - 15 Table - 16 Table - 17 Table - 18 Table - 19 Pin Description .................................................................................................................................................. 7 Operating Modes and Status...........................................................................................................................10 Input Reference Frequency Selection ............................................................................................................. 12 Reference Input Switch Control....................................................................................................................... 12 Absolute Maximum Ratings**.......................................................................................................................... 19 Recommended DC Operating Conditions** .................................................................................................... 19 DC Electrical Characteristics** ........................................................................................................................ 19 Performance** ................................................................................................................................................. 20 Intrinsic Jitter Unfiltered................................................................................................................................... 20 C1.5o (1.544 MHz) Intrinsic Jitter Filtered....................................................................................................... 21 C2o (2.048 MHz) Intrinsic Jitter Filtered.......................................................................................................... 21 8 kHz Input to 8 kHz Output Jitter Transfer ..................................................................................................... 21 1.544 MHz Input to 1.544 MHz Output Jitter Transfer..................................................................................... 21 2.048 MHz Input to 2.048 MHz Output Jitter Transfer..................................................................................... 22 8 kHz Input Jitter Tolerance ............................................................................................................................ 22 1.544 MHz Input Jitter Tolerance .................................................................................................................... 22 2.048 MHz Input Jitter Tolerance .................................................................................................................... 23 Timing Parameter Measurement Voltage Levels ............................................................................................ 24 Input / Output Timing....................................................................................................................................... 24
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IDT82V3002A PIN CONFIGURATION
MODE_sel0 MODE_sel1 TCLR RST Fref0 Fref1 MON_out IC F_sel0 F_sel1 IN_sel VSS VDD C6o C1.5o C3o C2o VSS VDD C4o IC IC C8o C16o C32o VDD VSS TCK
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29
TIE_en IC2 IC1 IC0 HOLDOVER FREERUN OSCi OSCo VDD VSS NORMAL FLOCK LOCK IC TSP RSP F32o F16o VSS VDD F8o IC IC F0o TDI TMS TRST TDO
Figure - 2 IDT82V3002A SSOP56 Package Pin Assignment
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PIN DESCRIPTION
Table - 1 Pin Description
Name Type Pin Number Description
VSS VDD OSCo OSCi
Power Power (CMOS) O (CMOS) I
12, 18, 27, Ground. 38, 47 0 V. All VSS pins should be connected to the ground. 13, 19, 26, Positive Supply Voltage. 37, 48 All VDD pins should be connected to +3.3 V nominal. 49 50 Oscillator Master Clock.
This pin is left unconnected.
Oscillator Master Clock.
This pin is connected to a clock source.
Reference Input 0. Fref0 I 5
This is one of the input reference sources (falling edge) used for synchronization. One of three possible frequencies (8 kHz, 1.544 MHz, or 2.048 MHz) may be used. The selection of the input reference is determined by IN_sel control input. See Table - 4. This pin is internally pulled up to VDD.
Fref1 IN_sel
I I
6 11
Reference Input 1.
See above. This pin is internally pulled up to VDD.
Reference Switch Input Control.
A logic low selects Reference Input 0 (Fref0) and a logic high selects Reference Input 1 (Fref1). The logic level at this input is gated in by the rising edge of F8o. This pin is internally pulled down to VSS.
F_sel1 F_sel0
I I
10 9
Input Frequency Select 1.
This input, in conjunction with F_sel0, determines which of three possible frequencies (8 kHz, 1.544 MHz, or 2.048 MHz ) may be input to the Reference Input 0 and Reference Input 1. See Table - 3.
Input Frequency Select 0.
See above.
Mode/Control Select 1. MODE_sel1 I 2
This input, in conjunction with MODE_sel0, determines the operation mode of the IDT82V3002A (Normal, Holdover or Freerun). The logic level at this input is gated in by the rising edge of F8o. This pin is internally pulled down to VSS. See Table - 2.
MODE_sel0
I
1
Mode/Control Select 0.
See above. The logic level at this input is gated in by the rising edge of F8o. This pin is internally pulled down to VSS.
Reset Input. RST I 4
A logic low at this pin resets the IDT82V3002A. To ensure proper operation, the device must be reset after the frequency of the input reference is changed and power-up. The RST pin should be held low for a minimum of 300 ns. While the RST pin is low, all framing and clock outputs are at logic high.
TIE Circuit Reset. TCLR I 3
Logic low at this input resets the TIE (Time Interval Error) control block, resulting in a realignment of output phase with input phase. The TCLR pin should be held low for a minimum of 300 ns. This pin is internally pulled up to VDD.
TIE Enable. TIE_en FLOCK LOCK I I (CMOS) O 56 45 44 52
A logic high at this pin enables the TIE control block while a logic low at this pin disables the TIE control block. The logic level at this input is gated in by the rising edge of F8o. This pin is internally pulled down to Vss.
Fast Lock Mode.
Set high to allow the DPLL to quickly lock to the input reference (less than 500 ms locking time).
Lock Indicator.
This output goes high when the DPLL is frequency locked to the input reference.
HOLDOVER (CMOS) O
Holdover Indicator.
This output goes to a logic high whenever the DPLL goes into Holdover Mode.
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Table - 1 Pin Description (Continued)
Name Type Pin Number Description
NORMAL FREERUN MON_out C32o C16o C8o C4o C2o C3o C1.5o C6o F32o
(CMOS) O (CMOS) O O (CMOS) O (CMOS) O (CMOS) O (CMOS) O (CMOS) O (CMOS) O (CMOS) O (CMOS) O (CMOS) O
46 51 7 25 24 23 20 17 16 15 14 40
Normal Indicator.
This output goes to a logic high whenever the DPLL goes into Normal Mode.
Freerun Indicator.
This output goes to a logic high whenever the DPLL goes into Freerun Mode.
Monitor Reference Out Of Capture Range.
A logic high at this pin indicates that the reference is off the nominal frequency by more than 12 ppm.
Clock 32.768 MHz.
This output is a 32.768 MHz clock used for ST-BUS operation.
Clock 16.384 MHz.
This output is a 16.384 MHz clock used for ST-BUS operation.
Clock 8.192 MHz.
This output is an 8.192 MHz clock used for ST-BUS operation.
Clock 4.096 MHz.
This output is a 4.096 MHz clock used for ST-BUS operation.
Clock 2.048 MHz.
This output is a 2.048 MHz clock used for ST-BUS operation.
Clock 3.088 MHz.
This output is a 3.088 MHz clock used for T1 applications.
Clock 1.544 MHz.
This output is a 1.544 MHz clock used for T1 applications.
Clock 6.312 MHz.
This output is a 6.312 MHz clock used for DS2 applications.
Frame Pulse ST-BUS 8.192 Mb/s.
This is an 8 kHz 31 ns active low framing pulse, which marks the beginning of an ST-BUS frame. This is typically used for ST-BUS operation at 8.192 Mb/s.
F16o F8o F0o
(CMOS) O (CMOS) O (CMOS) O
39 36 33
Frame Pulse ST-BUS 8.192 Mb/s.
This is an 8 kHz 61 ns active low framing pulse, which marks the beginning of an ST-BUS frame. This is typically used for ST-BUS operation at 8.192 Mb/s.
Frame Pulse.
This is an 8 kHz 122 ns active high framing pulse, which marks the beginning of a frame.
Frame Pulse ST-BUS 2.048 Mb/s.
This is an 8 kHz 244 ns active low framing pulse, which marks the beginning of an ST-BUS frame. This is typically used for ST-BUS operation at 2.048 Mb/s and 4.096 Mb/s.
RSP
(CMOS) O
41
Receive Sync Pulse.
This is an 8 kHz 488 ns active high framing pulse, which marks the beginning of an ST-BUS frame. This is typically used to connect to Siemens MUNICH-32 device.
TSP
(CMOS) O
42
Transmit Sync Pulse.
This is an 8 kHz 488 ns active high framing pulse, which marks the beginning of an ST-BUS frame. This is typically used to connect to Siemens MUNICH-32 device.
TDO TDI TRST
(CMOS) O I I
29 32 30
Test Serial Data Out.
JTAG serial data is output on this pin on the falling edge of TCK. This pin is held in high impedance state if JTAG scan is not enabled.
Test Serial Data In.
JTAG serial test instructions and data are shifted in on this pin. This pin is internally pulled up to VDD.
Test Reset.
Asynchronously initializes the JTAG TAP controller by putting it in Test-Logic-Reset state. This pin is internally pulled up to VDD. It is connected to the ground for normal applications. 8
IDT82V3002A WAN PLL WITH DUAL REFERENCE INPUTS
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Table - 1 Pin Description (Continued)
Name Type Pin Number Description
TCK TMS IC0, IC1, IC2 IC
I I -
28 31 53, 54, 55
Test Clock.
Provides a clock to JTAG test logic.
Test Mode Select.
JTAG signal that controls the state transitions of the TAP controller. This pin is internally pulled up to VDD.
Internal Connection.
Internal Use. These pins should be connected to VSS when in normal operation.
8, 21, 22, Internal Connection. 34, 35, 43 Internal Use. These pins should be left open when in normal operation.
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IDT82V3002A WAN PLL WITH DUAL REFERENCE INPUTS
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FUNCTIONAL DESCRIPTION
The IDT82V3002A is a WAN PLL with dual reference inputs, providing timing (clock) and synchronization (framing) signals to interface circuits for T1 and E1 Primary Rate Digital Transmission links. See Figure - 1. The detail is described in the following sections.
(S1) to Short Time Holdover (S4) automatically. See "Reference Input Switch" for details. When the operating mode is changed from one to another, the TIE control block will be disabled automatically as shown in Figure - 4, except the changes from Holdover (S3), Auto-Holdover (S2), or Short Time Holdover (S4) to Normal (S1).
3.1
STATE CONTROL CIRCUIT
The State Control Circuit is an important part of the IDT82V3002A. As shown in Figure - 3, the State Control Circuit outputs signals to enable/disable the TIE Control Block and control the operation mode of the DPLL Block based on MODE_sel0 and MODE_sel1, IN_sel, TIE_en pins and the result of the Invalid Input Signal Detection.
TIE Block Enable/Disable Output of the Invalid Input Signal Detection IN_sel DPLL Block Mode Control
State Control Circuit
TIE_en MODE_sel1 MODE_sel0
F8o
Figure - 3 State Control Block The IDT82V3002A has three possible modes of operation: Normal, Holdover and Freerun. The mode selection pins, MODE_sel1 and MODE_sel0, select the operation mode. See Table - 2. Table - 2 Operating Modes and Status
MODE_sel1 MODE_sel0 Mode
0 0 1 1
0 1 0 1
Normal Holdover Freerun Reserved
Figure - 4 shows the state control diagram. All state changes occur synchronously on the rising edge of F8o. Three operating modes, Normal (S1), Holdover (S3) and Freerun (S0), can be switched from one to another by changing the MODE_sel0 and MODE_sel1 logic levels. The mode changes between Normal (S1) and Auto-Holdover (S2) are triggered by the Invalid Input Reference Detection Circuit and irrelative to the logic levels on MODE_sel0 and MODE_sel1 pins. That is, at the stage of S1, the operating mode will be changed automatically from Normal (S1) to Auto-Holdover (S2) if an invalid input reference is detected (input reference is out of the capture range). At the stage of S2, if a transient on the IN_sel pin is detected, the device will change to the Short Time Holdover Mode (S4) with the TIE Control Block disabled; otherwise, the device will be changed back to Normal (S1) automatically if the input reference becomes valid. Refer to "Invalid Input Signal Detection" for more information. The mode changes between Normal (S1) and Short Time Holdover (S4) is determined by whether there is a transient on the IN_sel pin. If the input reference is switched from one to the other, a transient voltage will occur at the In_sel pin, which makes the device change from Normal
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Reset *
IE to T Au
e abl Dis ble isa IE D
S0 Freerun Mode_sel1 = 1 Mode_sel0 = 0
Auto
Aut oTI ED isa ble
TIE Disa ble
A
T uto
(Valid Input Reference Signal) TIE Enable (TIE_en = H)
S1 Normal Mode_sel1 = 0 Mode_sel0 = 0
(Valid Input Reference Signal) TIE Disable (TIE_en = L) (Invalid Input Reference Signal) Auto TIE Disable
Aut En ab oTI ED isa ble H)
S2 Auto - Holdover Mode_sel1 = 0 Mode_sel0 = 0
TIE
TIE Dis ab le
(TI E_ en =
le ( TIE _en =
to Au
ab Dis TIE
le
L)
S3 Holdover Mode_sel1 = 0 Mode_sel0 = 1
t ien ns Tra le el ab _s IN Dis TIE to Au
D TIE isab
* Note: After reset, Mode_sel1 and Mode_sel0 should be initially set to '10' or '00'.
No IN
t sien Tran _sel ) n=L IE_e le (T
TIE E
No IN
_se l Tr ans nab ien le ( t TIE _en =H )
S4 Short Time Holdover Mode_sel1 = 0 Mode_sel0 = X
el IN_s
t sien Tran D TIE le isab
Auto
Figure - 4 State Control Diagram 3.1.1 NORMAL MODE do. Typically, the DPLL will lock to the input reference within 500 ms if the FLOCK pin is high. 3.1.3 HOLDOVER MODE
Normal Mode is typically used when a slave clock source synchronized to the network is required. In this mode, the IDT82V3002A provides timing (C1.5o, C3o, C2o, C4o, C6o, C8o, C16o and C32o) and synchronization (F0o, F8o, F16o, F32o, TSP, RSP) signals, which are synchronous to the input reference. The input reference signals have a nominal frequency of 8 kHz, 2.048 MHz or 1.544 MHz. From a reset condition, the IDT82V3002A will take 30 seconds at most to make the output signals synchronous (phase locked) to the input reference. Whenever the IDT82V3002A enters Normal Mode, it will give an indication by setting the NORMAL pin to high. 3.1.2 FAST LOCK MODE
Fast Lock Mode is a submode of Normal Mode. It is used to allow the IDT82V3002A to lock to a reference more quickly than Normal Mode will
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Holdover Mode is typically used for short duration (e.g., 2 seconds) while network synchronization is temporarily disrupted. In Holdover Mode, the IDT82V3002A provides timing and synchronization signals, which are not locked to the external reference signal but based on storage techniques. The storage value is determined while the device is in Normal Mode and locked to the external reference signal. In Normal Mode, when the output signal is locked to the input reference signal, a numerical value corresponding to the output frequency is stored alternately in two memory locations every 30 ms. When the device is switched into Holdover Mode, the stored value in memory from between 30 ms and 60 ms is used to set the output frequency of the device. The frequency accuracy in Holdover Mode is 0.025 ppm, which
IDT82V3002A WAN PLL WITH DUAL REFERENCE INPUTS
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corresponds to the worst case of 18 frame (125 s per frame) slips in 24 hours. This meets AT&T TR62411 and Telcordia GR-1244-CORE Stratum 3 requirement of 0.37 ppm (255 frame slips per 24 hours). The HOLDOVER pin will be set to logic high whenever the IDT82V3002A goes into Holdover Mode. 3.1.4 FREERUN MODE
During the change from S4 to S1, the TIE Control Block can be manually enabled or disabled. See Figure - 4 for details.
3.4
REFERENCE INPUT MONITOR
Freerun Mode is typically used when a master clock source is required, or a system is just powered up and the network synchronization has not been achieved. In Freerun Mode, the IDT82V3002A provides timing and synchronization signals which are based on the master clock frequency (OSCi) only and not synchronized to the input reference signal. The accuracy of the output clock is equal to the accuracy of the master clock (OSCi). So if a 32 ppm output clock is required, the master clock must also be 32 ppm. Refer to "OSC" for more information. The FREERUN pin will go high whenever the IDT82V3002A works in Freerun Mode.
Telcordia GR-1244-CORE standard recommends that a DPLL should be able to reject the references that are off the nominal frequency by more than 12 ppm. The IDT82V3002A monitors the TIE Control Block input frequency and outputs a signal on the MON_out pin to indicate the result. Whenever the reference is off the nominal frequency by more than 12 ppm, the MON_out pin will go high. The MON_out signal is updated every 2 seconds.
3.5
INVALID INPUT SIGNAL DETECTION
3.2
FREQUENCY SELECT CIRCUIT
The input reference can be 8 kHz, 1.544 MHz or 2.048 MHz. As shown in Table - 3, the F_sel1 and F_sel0 pins determine which of the three frequencies is selected. Note that both the reference inputs Fref0 and Fref1 must have the same frequency applied to them. Every time the frequency is changed, the device must be reset to make the change effective. Table - 3 Input Reference Frequency Selection
F_sel1 F_sel0 Input Frequency
This circuit monitors the input reference signal into the IDT82V3002A. The IDT82V3002A will automatically enter Holdover Mode (Auto-Holdover) if the incoming reference signal is out of the capture range (See Table - 8), including a complete loss of input reference, or a large frequency shift in the input reference. When the input reference returns to normal, the DPLL will return to Normal Mode. In Holdover Mode, the output signal of the IDT82V3002A is based on the output signal 30 ms to 60 ms prior to entering Holdover Mode. The amount of phase drift in Holdover Mode is negligible because Holdover Mode is very accurate (e.g., 0.025 ppm). Consequently, the phase delay between the input and output after switching back to Normal Mode is preserved.
3.6
TIE CONTROL BLOCK
0 0 1 1
0 1 0 1
Reserved 8 kHz 1.544 MHz 2.048 MHz
3.3
REFERENCE INPUT SWITCH
If the current reference is badly damaged or lost, it is necessary to use the other reference or the one generated by the storage techniques instead. But when switching the reference, a step change in phase on the input reference will occur. And a step change in phase at the input of the DPLL would lead to unacceptable phase changes in the output signals. The TIE control block, when enabled, prevents a step change in phase on the input reference signals from causing a step change in phase at the output of the DPLL block. Figure - 5 shows the TIE Control Block diagram.
The IDT82V3002A accepts two simultaneous reference input signals, Fref0 and Fref1, and operates on their falling edges. The reference is selected by the IN_sel pin, as shown in Table - 4. The selected reference signal is sent to the TIE control block, Reference Input Monitor and Invalid Input Signal Detection block to be further processed. Table - 4 Reference Input Switch Control
IN_sel Input Reference
0 1
Fref0 Fref1
When a transient voltage occurs at the IN_sel pin, the IDT82V3002A will automatically switch to the Short Time Holdover Mode (S4) with the TIE Control Block disabled. At the S4 stage, if no transient occurs on the IN_sel pin, the reference signal will be changed from one to the other and the device will switch back to Normal Mode (S1) automatically.
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TIE_en
Step Generation
IN_sel Fref0 Fref1 Feedback signal Select Circuit Fref Measure Circuit Storage Circuit Trigger Circuit Virtual Reference Signal
TCLR
Figure - 5 TIE Control Circuit Diagram
The TIE Control Block will work under the control of the Step Generation circuit when it is enabled manually or automatically (by the TIE_en pin or TIE auto-enable logic generated by the State Control Circuit). The selected reference signal is compared with the feedback signal (current output feedback from the Frequency Select Circuit) by the Measure Circuit. The phase difference between the input reference and
the feedback signal is sent to the Storage Circuit for TIE correction. The Trigger Circuit generates a virtual reference with the phase corrected to the same position as the previous reference according to the value stored in the Storage Circuit. With this TIE correction mechanism, the reference is switched without generating a step change in phase. Figure - 6 shows the phase transient that would result if a reference switch is performed with the TIE Control Block enabled.
Fref0 Fref1 Time = 0.00 s Time = 0.25 s Time = 0.50 s Time = 0.75 s Time = 1.0 s Time = 1.25 s Time = 1.50 s Time = 1.75 s
Input Clock
Output Clock
Figure - 6 Reference Switch with TIE Control Block Enabled The phase difference in the Storage Circuit can be cleared by applying a logic low pulse to the TCLR pin. The reset pulse should be at least 300 ns. When the IDT82V3002A primarily enters Holdover Mode for short time periods and then turns back to Normal Mode, the TIE Control Circuit should not be enabled. This will prevent undesired accumulated phase change between the input and output. If the TIE Control Block is disabled manually or automatically during
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the reference switching, the phase of the output signal will align with that of the new reference. The phase slope is limited to 5 ns per 125 s. Figure - 7 shows the phase transient resulting from a reference switch with the TIE Control Block disabled.
IDT82V3002A WAN PLL WITH DUAL REFERENCE INPUTS
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Fref0 Fref1 Time = 0.00 s Time = 0.25 s Time = 0.50 s Time = 0.75 s Time = 1.0 s Time = 1.25 s Time = 1.50 s Time = 1.75 s
Input Clock
Output Clock
Figure - 7 Reference Switch with TIE Control Block Disabled
3.7
DPLL BLOCK
As shown in Figure - 8, the DPLL Block consists of a Phase Detector, a Limiter, a Loop Filter, a Digital Control Oscillator and Dividers.
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Output Interface
24.704 MHz Fraction_T1 Digital Control Oscillator T1_Divider C1.5o C3o C2o C4o C8o C16o C32o F0o F8o F16o F32o RSP TSP C6o
32.768 MHz
E1_Divider
Fraction_C6 25.248 MHz
C6_Divider
Loop Filter
Limiter
Phase Detector
Feedback Signal
Frequency Selection Circuit
FLOCK
Virtual Reference F_sel1 F_sel0
Figure - 8 DPLL Block Diagram 3.7.1 PHASE DETECTOR (PHD) FLOCK pin to high, the device will enter fast lock mode. In this mode, the Limiter is disabled and the DPLL will lock to the incoming reference within 500 ms. 3.7.3 LOOP FILTER
In Normal Mode, the Phase Detector compares the virtual reference signal from the TIE Control Circuit with the feedback signal from the Frequency Select Circuit, and outputs an error signal corresponding to the phase difference between the two. This error signal is then sent to the Limiter circuit for phase slope control. The feedback signal can be 8 kHz, 2.048 MHz or 1.544 MHz, as selected by F_sel1 and F_sel0 pins. Refer to Table - 3 for details. In Freerun or Holdover Mode, the Frequency Select Circuit, the Phase Detector and the Limiter are not active and the input reference signals are not used. 3.7.2 LIMITER
The Loop Filter ensures that the jitter transfer meets ETS 300 011 and AT&T TR62411 requirements. This Loop Filter works similarly to a first order low pass filter with 2.1 Hz cutoff frequency for the three valid input reference signals (8 kHz, 2.048 MHz or 1.544 MHz). The output of the Loop Filter goes to the Digital Control Oscillator directly or via the Fraction blocks, in which E1, T1 and C6 signals are generated. 3.7.4 FRACTION BLOCK
The Limiter is used to ensure that the DPLL responds to all input transient conditions with a maximum output phase slope of 5 ns per 125 s. This well meets AT&T TR62411 and Telcordia GR-1244-CORE specifications, which specify the maximum phase slope of 7.6 ns per 125 s and 81 ns per 1.326 ms respectively. In Normal Mode, the Limiter receives the error signal from the Phase Detector, limits the phase slope within 5 ns per 125 s and sends the limited signal to the Loop Filter. The fast lock mode is a submode of Normal Mode. By setting the
15
By applying some algorithms to the incoming E1 signal, the Fraction_C6 and Fraction_T1 blocks generate C6 and T1 signals respectively. 3.7.5 DIGITAL CONTROL OSCILLATOR (DCO)
In Normal Mode, the DCO receives three limited and filtered signals from Loop Filter or Fraction blocks. Based on the received signals, the DCO generates three digital outputs, 25.248 MHz, 32.768 MHz and
IDT82V3002A WAN PLL WITH DUAL REFERENCE INPUTS
INDUSTRIAL TEMPERATURE RANGE
24.704 MHz for C6, E1 and T1 divider respectively. In Holdover mode, the DCO is running at the same frequency which is generated by using the storage techniques. In Freerun mode, the DCO is running at the same frequency as that of the master clock. 3.7.6 LOCK INDICATOR
the OSCi input of the IDT82V3002A, and the OSCo output should be left open as shown in Figure - 9.
IDT82V3002A
OSCi +3.3 V
In Normal Mode, the LOCK pin will be set to high only when the following equation is satisfied: |fout - fin| 0.4 ppm fout = the average frequency of the output clock signal from the DPLL (within 2 seconds) fin = the average frequency of the input reference (within 2 seconds) In other operation modes, the LOCK pin remains low. 3.7.7 OUTPUT INTERFACE
OSCo No Connection
+3.3 V 20 MHz OUT GND
0.1 F
The Output Interface uses three output signals of the DCO to generate eight types of clock signals and six types of framing signals totally. The 32.768 MHz signal is used by the E1_divider to generate five types of clock signals (C2o, C4o, C8o, C16o and C32o) with nominal 50% duty cycle and six types of framing signals (F0o, F8o, F16o, F32o, RSP and TSP). The 24.704 MHz signal is used by the T1_divider to generate two types of T1 signals (C1.5o and C3o) with nominal 50% duty cycle. The 25.248 MHz signal is used by the C6_divider to generate a C6o signal with nominal 50% duty cycle. All these output signals are synchronous to F8o.
Figure - 9 Clock Oscillator Circuit
3.9
JTAG
The IDT82V3002A supports IEEE 1149.1 JTAG Scan.
3.10
RESET CIRCUIT
A simple power up reset circuit is shown in Figure - 10. Resistor Rp is used for protection only and limits current into the RST pin during power down conditions. The reset low time is not critical but should be greater than 300 ns. In Figure - 10, the reset low time is about 50 s.
3.8
OSC
IDT82V3002A
3.3 V
The IDT82V3002A can use a clock as the master timing source. In Freerun Mode, the frequency tolerance at the clock outputs is identical to that of the source at the OSCi pin. For applications not requiring an accurate Freerun Mode, the tolerance of the master timing source may be 100 ppm. For applications requiring an accurate Freerun Mode, such as AT&T TR62411, the tolerance of the master timing source must be no greater than 32 ppm. The desired capture range should be taken into consideration when determining the accuracy of the master timing source. The sum of the accuracy of the master timing source and the capture range of the IDT82V3002A will always equal 230 ppm. For example, if the master timing source is 100 ppm, the capture range will be 130 ppm. 3.8.1 CLOCK OSCILLATOR
R 10 k RST Rp 1 k C 1 F
Figure - 10 Power-Up Reset Circuit
When selecting a clock oscillator, numerous parameters must be considered, including absolute frequency, frequency change over temperature, output rise and fall times, output levels and duty cycle. For applications requiring 32 ppm clock accuracy, the following clock oscillator module may be used. FOX F7C-2E3-20.0 MHz Frequency: 20 MHz Tolerance: 25 ppm 0C to 70C Rise & Fall Time:10 ns (0.33 V 2.97 V 15 pF) Duty Cycle: 40% to 60% The output clock should be connected directly (not AC coupled) to
16
IDT82V3002A WAN PLL WITH DUAL REFERENCE INPUTS
INDUSTRIAL TEMPERATURE RANGE
4 MEASURES MANCE
OF
PERFOR-
large input jitter signals (e.g., 75% of the specified maximum jitter tolerance).
The following are some synchronizer performance indicators and their corresponding definitions.
4.4
FREQUENCY ACCURACY
4.1
INTRINSIC JITTER
Intrinsic jitter is the jitter produced by the synchronizing circuit and is measured at its output. It is measured by applying a reference signal with no jitter to the input of the device, and measuring its output jitter. Intrinsic jitter may also be measured when the device is in a nonsynchronizing mode, such as free running or holdover, by measuring the output jitter of the device. Intrinsic jitter is usually measured with various band limiting filters depending on the applicable standards. In the IDT82V3002A, the intrinsic Jitter is limited to less than 0.02 UI on the 2.048 MHz and 1.544 MHz clocks.
Frequency accuracy is defined as the absolute tolerance of an output clock signal when it is not locked to an external reference, but is operating in a free running mode. For the IDT82V3002A, the Freerun accuracy is equal to the Master Clock (OSCi) accuracy.
4.5
HOLDOVER ACCURACY
4.2
JITTER TOLERANCE
Holdover accuracy is defined as the absolute tolerance of an output clock signal, when it is not locked to an external reference signal, but is operating using storage techniques. For the IDT82V3002A, the storage value is determined while the device is in Normal Mode and locked to an external reference signal. The absolute Master Clock (OSCi) accuracy of the IDT82V3002A does not affect Holdover accuracy, but the change in OSCi accuracy while in Holdover Mode does.
Jitter tolerance is a measure of the ability of a DPLL to operate properly (i.e., remain in lock and or regain lock in the presence of large jitter magnitudes at various jitter frequencies) when jitter is applied to its reference. The applied jitter magnitude and jitter frequency depends on the applicable standards.
4.6
CAPTURE RANGE
4.3
JITTER TRANSFER
Jitter transfer or jitter attenuation refers to the magnitude of jitter at the output of a device for a given amount of jitter at the input of the device. Input jitter is applied at various amplitudes and frequencies, and output jitter is measured with various filters depending on the applicable standards. For the IDT82V3002A, two internal elements determine the jitter attenuation. This includes the internal 2.1 Hz low pass loop filter and the phase slope limiter. The phase slope limiter limits the output phase slope to 5 ns/125 s. Therefore, if the input signal exceeds this rate, such as for very large amplitude low frequency input jitter, the maximum output phase slope will be limited (i.e., attenuated) to 5 ns/125 s. The IDT82V3002A has fourteen outputs with three possible input frequencies for a total of 42 possible jitter transfer functions. Since all outputs are derived from the same signal, the jitter transfer values for three cases, 8 kHz to 8 kHz, 1.544 MHz to 1.544 MHz and 2.048 MHz to 2.048 MHz can be applied to all outputs. It should be noted that 1 UI at 1.544 MHz is 644 ns, which is not equal to 1 UI at 2.048 MHz, which is 488 ns. Consequently, a transfer value using different input and output frequencies must be calculated in common units (e.g., seconds). Using the above method, the jitter attenuation can be calculated for all combinations of inputs and outputs based on the three jitter transfer functions provided. Note that the resulting jitter transfer functions for all combinations of inputs (8 kHz, 1.544 MHz, 2.048 MHz) and outputs (8 kHz, 1.544 MHz, 3.088 MHz, 6.312 MHz, 2.048 MHz, 4.096 MHz, 8.192 MHz, 16.384 MHz, 32.768 MHz) for a given input signal (jitter frequency and jitter amplitude) are the same. Since intrinsic jitter is always present, jitter attenuation will appear to be lower for small input jitter signals than for large ones. Consequently, accurate jitter transfer function measurements are usually made with
17
Also referred to as pull-in range. This is the input frequency range over which the synchronizer must be able to pull into synchronization. The IDT82V3002A capture range is equal to 230 ppm minus the accuracy of the master clock (OSCi). For example, a 32 ppm master clock results in a capture range of 198 ppm. The Telcordia GR-1244-CORE standard, recommends that the DPLL should be able to reject references that are off the nominal frequency by more than 12 ppm. The IDT82V3002A provides one pin, MON_out, to indicate whether the primary reference are within 12 ppm of the nominal frequency.
4.7
LOCK RANGE
This is the input frequency range over which the synchronizer must be able to maintain synchronization. The lock range is equal to the capture range for the IDT82V3002A.
4.8
PHASE SLOPE
Phase slope is measured in seconds per second and is the rate at which a given signal changes phase with respect to an ideal signal. The given signal is typically the output signal. The ideal signal is of constant frequency and is nominally equal to the value of the final output signal or final input signal.
4.9
TIME INTERVAL ERROR (TIE)
TIE is the time delay between a given timing signal and an ideal timing signal.
4.10
MAXIMUM TIME INTERVAL ERROR (MTIE)
MTIE is the maximum peak to peak delay between a given timing signal and an ideal timing signal within a particular observation period.
IDT82V3002A WAN PLL WITH DUAL REFERENCE INPUTS
INDUSTRIAL TEMPERATURE RANGE
4.11
PHASE CONTINUITY
Phase continuity is the phase difference between a given timing signal and an ideal timing signal at the end of a particular observation period. Usually, the given timing signal and the ideal timing signal are of the same frequency. Phase continuity applies to the output of the synchronizer after a signal disturbance due to a mode change. The observation period is usually the time from the disturbance, to just after the synchronizer has settled to a steady state. In the case of the IDT82V3002A, the output signal phase continuity is maintained to within 5 ns at the instance (over one frame) of all mode changes. The total phase shift, depending on the type of mode change, may accumulate up to 200 ns over many frames. The rate of change of the 200 ns phase shift is limited to a maximum phase slope of approximately 5 ns/125 s. This meets AT&T TR62411 maximum phase slope requirement of 7.6 ns/125 s and Telcordia GR-1244CORE (81 ns/1.326 ms).
4.12
PHASE LOCK TIME
This is the time it takes the synchronizer to phase lock to the input signal. Phase lock occurs when the input signal and output signal are not changing in phase with respect to each other (not including jitter). Lock time is very difficult to determine because it is affected by many factors, which include: i) Initial input to output phase difference ii) Initial input to output frequency difference iii) Synchronizer loop filter iv) Synchronizer limiter Although a short lock time is desirable, it is not always possible to achieve due to other synchronizer requirements. For instance, better jitter transfer performance is achieved with a lower frequency loop filter which increases lock time. And better (smaller) phase slope performance (limiter) results in longer lock times. The IDT82V3002A loop filter and limiter were optimized to meet the AT&T TR62411 jitter transfer and phase slope requirements. Consequently, phase lock time, which is not a standards requirement, may be longer than in other applications. See Table - 8 for Maximum Phase Lock Time. The IDT82V3002A provides a fast lock pin (FLOCK), which enables the DPLL to lock to an incoming reference within approximately 500 ms when set high.
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5
TEST SPECIFICATIONS
Table - 5 Absolute Maximum Ratings**
Rating Power Supply Voltage Voltage on Any Pin with Respect to Ground Package Power Dissipation Storage Temperature -55 Min. -0.5 -0.5 Max. 5.0 VDD + 0.5 200 125 Unit V V mW C
Note: Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
Table - 6 Recommended DC Operating Conditions**
Parameter Operating Temperature Power Supply Voltage Min. -40 3.0 Typ. Max. +85 3.6 Unit C V
Table - 7 DC Electrical Characteristics**
Parameter IDDS IDD VCIH VCIL VTIH VTIL Description Supply current with OSCi = 0 V Supply current with OSCi = Clock CMOS high-level input voltage CMOS low-level input voltage TTL high-level input voltage TTL low-level input voltage Input leakage current: Normal (low level) Normal (high level) Pull up (low level) Pull up (high level) Pull down (low level) Pull down (high level) High-level output voltage Low-level output voltage -15 -15 -100 -15 -15 0 2.4 0.4 2.0 0.8 15 15 0 15 15 100 0.7VDD 0.3VDD Min Typ. Max 10 60 Units mA mA V V V V Outputs unloaded Outputs unloaded OSCi, Fref0 and Fref1 OSCi, Fref0 and Fref1 All input pins except for OSCi, Fref0 and Fref1 All input pins except for OSCi, Fref0 and Fref1 Test Conditions
IIL
A
VI = VDD or 0 V
VOH VOL
V V
IOH = 8 mA IOL = 8 mA
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5.1
AC ELECTRICAL CHARACTERISTICS
Table - 8 Performance**
Description Freerun Mode accuracy with OSCi at : 0 ppm Freerun Mode accuracy with OSCi at : 32 ppm Freerun Mode accuracy with OSCi at : 100 ppm Holdover Mode accuracy with OSCi at : 0 ppm Holdover Mode accuracy with OSCi at : 32 ppm Holdover Mode accuracy with OSCi at : 100 ppm Capture range with OSCi at : 0 ppm Capture range with OSCi at : 32 ppm Capture range with OSCi at : 100 ppm Phase lock time Output phase continuity with reference switch Output phase continuity with mode switch to Normal Output phase continuity with mode switch to Freerun Output phase continuity with mode switch to Holdover MON_out is low level - Reference frequency accuracy must be: MTIE (maximum time interval error) Output phase slope Reference input for Auto-Holdover with 8 kHz Reference input for Auto-Holdover with 1.544 MHz Reference input for Auto-Holdover with 2.048 MHz
**Note: Voltages are with respect to ground (Vss) unless otherwise stated.
Min -0 -32 -100 -0.025 -0.025 -0.025 -230 -198 -130
Typ.
Max +0 +32 +100 +0.025 +0.025 +0.025 +230 +198 +130
Units ppm ppm ppm ppm ppm ppm ppm ppm ppm s
Test Conditions / Notes* 5-8 5-8 5-8 1, 2, 4, 6-8, 40, 41 1, 2, 4, 6-8, 40, 41 1, 2, 4, 6-8, 40, 41 1-3, 6-8 1-3, 6-8 1-3, 6-8 1-3, 6-14, 42 1-3, 6-14 1-2, 4-14 1-2, 5-14 1-3, 6-14
50 200 200 200 50 -12 +12 600 40 -18 k -36 k -36 k +18 k +36 k +36 k
ns ns ns ns ppm ns s/s ppm ppm ppm
1-14, 27 1-14, 27 1-3, 6, 9-11 1-3, 7, 9-11 1-3, 8, 9-11
Table - 9 Intrinsic Jitter Unfiltered
Description Intrinsic jitter at F8o ( 8 kHz ) Intrinsic jitter at F0o ( 8 kHz ) Intrinsic jitter at F16o ( 8 kHz ) Intrinsic jitter at C1.5o ( 1.544 MHz ) Intrinsic jitter at C3o ( 3.088 MHz ) Intrinsic jitter at C2o ( 2.048 MHz ) Intrinsic jitter at C6o ( 6.312 MHz ) Intrinsic jitter at C4o ( 4.096 MHz ) Intrinsic jitter at C8o ( 8.192 MHz ) Intrinsic jitter at C16o ( 16.834 MHz ) Intrinsic jitter at TSP ( 8 kHz ) Intrinsic jitter at RSP ( 8 kHz ) Intrinsic jitter at C32o ( 32.768 MHz ) 20 Min Typ Max 0.0001 0.0001 0.0001 0.015 0.03 0.01 0.06 0.02 0.04 0.04 0.0001 0.0001 0.08 Units UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp Test Conditions / Notes* 1-14, 21-24, 28 1-14, 21-24, 28 1-14, 21-24, 28 1-14, 21-24, 29 1-14, 21-24, 31 1-14, 21-24, 30 1-14, 21-24 1-14, 21-24, 32 1-14, 21-24, 33 1-14, 21-24, 34 1-14, 21-24, 34 1-14, 21-24, 34 1-14, 21-24, 35
IDT82V3002A WAN PLL WITH DUAL REFERENCE INPUTS
INDUSTRIAL TEMPERATURE RANGE
Table - 10 C1.5o (1.544 MHz) Intrinsic Jitter Filtered
Description Intrinsic jitter (4 Hz to 100 kHz filter) Intrinsic jitter (10 Hz to 40 kHz filter) Intrinsic jitter (8 kHz to 40 kHz filter) Intrinsic jitter (10 Hz to 8 kHz filter) Min Typ Max 0.008 0.006 0.006 0.003 Units UIpp UIpp UIpp UIpp Test Conditions / Notes* 1-14, 21-24, 29 1-14, 21-24, 29 1-14, 21-24, 29 1-14, 21-24, 29
Table - 11 C2o (2.048 MHz) Intrinsic Jitter Filtered
Description Intrinsic jitter (4 Hz to 100 kHz filter) Intrinsic jitter (10 Hz to 40 kHz filter) Intrinsic jitter (8 kHz to 40 kHz filter) Intrinsic jitter (10 Hz to 8 kHz filter) Min Typ Max 0.005 0.004 0.003 0.002 Units UIpp UIpp UIpp UIpp Test Conditions / Notes* 1-14, 21-24, 30 1-14, 21-24, 30 1-14, 21-24, 30 1-14, 21-24, 30
Table - 12 8 kHz Input to 8 kHz Output Jitter Transfer
Description Jitter attenuation for 1 Hz@0.01 UIpp input Jitter attenuation for 1 Hz@0.54 UIpp input Jitter attenuation for 10 Hz@0.10 UIpp input Jitter attenuation for 60 Hz@0.10 UIpp input Jitter attenuation for 300 Hz@0.10 UIpp input Jitter attenuation for 3600 Hz@0.005 UIpp input Min 0 6 15 32 42 50 Typ Max 6 16 22 38 Units dB dB dB dB dB dB Test Conditions / Notes* 1-3, 6, 9-14, 21-22, 24, 28, 35 1-3, 6, 9-14, 21-22, 24, 28, 35 1-3, 6, 9-14, 21-22, 24, 28, 35 1-3, 6, 9-14, 21-22, 24, 28, 35 1-3, 6, 9-14, 21-22, 24, 28, 35 1-3, 6, 9-14, 21-22, 24, 28, 35
Table - 13 1.544 MHz Input to 1.544 MHz Output Jitter Transfer
Description Jitter attenuation for 1 Hz@20 UIpp input Jitter attenuation for 1 Hz@104 UIpp input Jitter attenuation for 10 Hz@20 UIpp input Jitter attenuation for 60 Hz@20 UIpp input Jitter attenuation for 300 Hz@20 UIpp input Jitter attenuation for 10 kHz@0.3 UIpp input Jitter attenuation for 40 kHz@0.3 UIpp input Min 0 6 17 33 45 48 50 Typ Max 6 16 22 38 Units dB dB dB dB dB dB dB Test Conditions / Notes* 1-3, 7, 9-14, 21-22, 24, 29, 35 1-3, 7, 9-14, 21-22, 24, 29, 35 1-3, 7, 9-14, 21-22, 24, 29, 35 1-3, 7, 9-14, 21-22, 24, 29, 35 1-3, 7, 9-14, 21-22, 24, 29, 35 1-3, 7, 9-14, 21-22, 24, 29, 35 1-3, 7, 9-14, 21-22, 24, 29, 35
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IDT82V3002A WAN PLL WITH DUAL REFERENCE INPUTS
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Table - 14 2.048 MHz Input to 2.048 MHz Output Jitter Transfer
Description Jitter at output for 1 Hz@3.00 UIpp input Jitter at output for 1 Hz@3.00 UIpp input with 40 Hz to 100 Hz filter Jitter at output for 3 Hz@2.33 UIpp input Jitter at output for 3 Hz@2.33 UIpp input with 40 Hz to 100 Hz filter Jitter at output for 5 Hz@2.07 UIpp input Jitter at output for 5 Hz@2.07 UIpp input with 40 Hz to 100 Hz filter Jitter at output for 10 Hz@1.76 UIpp input Jitter at output for 10 Hz@1.76 UIpp input with 40 Hz to 100 Hz filter Jitter at output for 100 Hz@1.50 UIpp input Jitter at output for 100 Hz@1.50 UIpp input with 40 Hz to 100 Hz filter Jitter at output for 2400 Hz@1.50 UIpp input Jitter at output for 2400 Hz@1.50 UIpp input with 40 Hz to 100 Hz filter Jitter at output for 100 kHz@0.20 UIpp input Jitter at output for 100 kHz@0.20 UIpp input with 40 Hz to 100 Hz filter Min Typ Max 2.5 0.07 1.4 0.10 0.90 0.10 0.40 0.10 0.06 0.05 0.04 0.03 0.04 0.02 Units UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp Test Conditions / Notes* 1-3, 8, 9-14, 21-22, 24, 30, 35 1-3, 8, 9-14, 21-22, 24, 30, 36 1-3, 8, 9-14, 21-22, 24, 30, 35 1-3, 8, 9-14, 21-22, 24, 30, 36 1-3, 8, 9-14, 21-22, 24, 30, 35 1-3, 8, 9-14, 21-22, 24, 30, 36 1-3, 8, 9-14, 21-22, 24, 30, 35 1-3, 8, 9-14, 21-22, 24, 30, 36 1-3, 8, 9-14, 21-22, 24, 30, 35 1-3, 8, 9-14, 21-22, 24, 30, 36 1-3, 8, 9-14, 21-22, 24, 30, 35 1-3, 8, 9-14, 21-22, 24, 30, 36 1-3, 8, 9-14, 21-22, 24, 30, 35 1-3, 8, 9-14, 21-22, 24, 30
Table - 15 8 kHz Input Jitter Tolerance
Description Jitter tolerance for 1 Hz input Jitter tolerance for 5 Hz input Jitter tolerance for 20 Hz input Jitter tolerance for 300 Hz input Jitter tolerance for 400 Hz input Jitter tolerance for 700 Hz input Jitter tolerance for 2400 Hz input Jitter tolerance for 3600 Hz input Min 0.80 0.70 0.60 0.16 0.14 0.07 0.02 0.01 Typ Max Units UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp Test Conditions / Notes* 1-3, 6, 9-14, 21-22, 24-26, 28 1-3, 6, 9-14, 21-22, 24-26, 28 1-3, 6, 9-14, 21-22, 24-26, 28 1-3, 6, 9-14, 21-22, 24-26, 28 1-3, 6, 9-14, 21-22, 24-26, 28 1-3, 6, 9-14, 21-22, 24-26, 28 1-3, 6, 9-14, 21-22, 24-26, 28 1-3, 6, 9-14, 21-22, 24-26, 28
Table - 16 1.544 MHz Input Jitter Tolerance
Description Jitter tolerance for 1 Hz input Jitter tolerance for 5 Hz input Jitter tolerance for 20 Hz input Jitter tolerance for 300 Hz input Jitter tolerance for 400 Hz input Jitter tolerance for 700 Hz input Jitter tolerance for 2400 Hz input Jitter tolerance for 10 kHz input Jitter tolerance for 40 kHz input Min 150 140 130 38 25 15 5 1.2 0.5 Typ Max Units UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp Test Conditions / Notes* 1-3, 7, 9-14, 21-22, 24-26, 29 1-3, 7, 9-14, 21-22, 24-26, 29 1-3, 7, 9-14, 21-22, 24-26, 29 1-3, 7, 9-14, 21-22, 24-26, 29 1-3, 7, 9-14, 21-22, 24-26, 29 1-3, 7, 9-14, 21-22, 24-26, 29 1-3, 7, 9-14, 21-22, 24-26, 29 1-3, 7, 9-14, 21-22, 24-26, 29 1-3, 7, 9-14, 21-22, 24-26, 29
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Table - 17 2.048 MHz Input Jitter Tolerance
Description Jitter tolerance for 1 Hz input Jitter tolerance for 5 Hz input Jitter tolerance for 20 Hz input Jitter tolerance for 300 Hz input Jitter tolerance for 400 Hz input Jitter tolerance for 700 Hz input Jitter tolerance for 2400 Hz input Jitter tolerance for 10 kHz input Jitter tolerance for 100 kHz input Min 150 140 130 40 33 18 5.5 1.3 0.4 Typ Max Units UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp UIpp Test Conditions / Notes* 1-3, 8, 9-14, 21-22, 24-26, 30 1-3, 8, 9-14, 21-22, 24-26, 30 1-3, 8, 9-14, 21-22, 24-26, 30 1-3, 8, 9-14, 21-22, 24-26, 30 1-3, 8, 9-14, 21-22, 24-26, 30 1-3, 8, 9-14, 21-22, 24-26, 30 1-3, 8, 9-14, 21-22, 24-26, 30 1-3, 8, 9-14, 21-22, 24-26, 30 1-3, 8, 9-14, 21-22, 24-26, 30
*Notes:
Voltages are with respect to ground (VSS) unless otherwise stated. Supply voltage and operating temperature are as per Recommended Operating Conditions. Timing parameters are as per AC Electrical Characteristics - Timing Parameter Measurement Voltage Levels 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. Fref0 reference input selected. Fref1 reference input selected. Normal Mode selected. Holdover Mode selected. Freerun Mode selected. 8 kHz Frequency Mode selected. 1.544 MHz Frequency Mode selected. 2.048 MHz Frequency Mode selected. Master clock input OSCi at 20 MHz 0 ppm. Master clock input OSCi at 20 MHz 32 ppm. Master clock input OSCi at 20 MHz 100 ppm. Selected reference input at 0 ppm. Selected reference input at 32 ppm. Selected reference input at 100 ppm. For Freerun Mode of 0 ppm. For Freerun Mode of 32 ppm. For Freerun Mode of 100 ppm. For capture range of 230 ppm. For capture range of 198 ppm. For capture range of 130 ppm. 25 pF capacitive load. OSCi Master Clock jitter is less than 2 nspp, or 0.04 UIpp where 1 UIpp = 1/20 MHz. Jitter on reference input is obtained at slightly higher input jitter amplitudes. Applied jitter is sinusoidal. Minimum applied input jitter magnitude to regain synchronization. Loss of synchronization is obtained at slightly higher input jitter amplitudes. Within 10 ms of the state, reference or input change. 1 UIpp = 125 s for 8 kHz signals. 1 UIpp = 648 ns for 1.544 MHz signals. 1 UIpp = 488 ns for 2.048 MHz signals. 1 UIpp = 323 ns for 3.088 MHz signals. 1 UIpp = 244 ns for 4.096 MHz signals. 1 UIpp = 122 ns for 8.192 MHz signals. 1 UIpp = 61 ns for 16.484 MHz signals. 1 UIpp = 30 ns for 32.968 MHz signals. No filter. 40 Hz to 100 kHz bandpass filter. With respect to reference input signal frequency. After chip reset or TIE reset. Master clock duty 40% to 60%. Prior to Holdover Mode, device as in Normal Mode and phase locked. With input frequency offset of 100 ppm.
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6
TIMING CHARACTERISTICS
Table - 18 Timing Parameter Measurement Voltage Levels
Parameter VT VHM VLM Description Threshold Voltage Rise and Fall Threshold Voltage High Rise and Fall Threshold Voltage Low CMOS 0.5VDD 0.7VDD 0.3VDD Units V V V
Notes: 1. Voltages are with respect to ground (VSS) unless otherwise stated. 2. Supply voltage and operating temperature are as per Recommended Operating Conditions. 3. Timing for input and output signals is based on the worst case result of the CMOS thresholds
Timing Reference Points ALL SIGNALS tIRF,tORF
Table - 19 Input / Output Timing
Parameter tRW tIRF tR8D tR15D tR2D tF0D tF16S tF16H tC15D tC3D tC6D tC2D tC4D tC8D tC16D tC32D tTSPD tRSPD tC15W tC3W tC6W Description Reference input pulse width high or low Reference input rise or fall time 8 kHz reference input to F8o delay 1.544 MHz reference input to F8o delay 2.048 MHz reference input to F8o delay F8o to F0o delay F16o setup to C16o falling F16o hold to C16o falling F8o to C1.5o delay F8o to C3o delay F8o to C6o delay F8o to C2o F8o to C4o F8o to C8o delay F8o to C16o delay F8o to C32o delay F8o to TSP delay F8o to RSP delay C1.5o pulse width high or low C3o pulse width high or low C6o pulse width high or low 24 118 25 25 -3 -3 -3 -2 -2 -2 -2 -2 -3 -3 0 1.6 1.6 0 0 0 0 2 0 0 323 161 82 8 332 253 121 124 40 40 +3 +3 +3 +2 +2 +2 +2 +2 +3 +3 Min 51 10 Typ Max Units ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns Test Conditions
VHM VT VLM tIRF,tORF
IDT82V3002A WAN PLL WITH DUAL REFERENCE INPUTS
INDUSTRIAL TEMPERATURE RANGE
Table - 19 Input / Output Timing (Continued)
Parameter tC2W tC4W tC8W tC16WL tC32WH tTSPW tRSPW tF0WL tF8WH tF16WL t0RF tS tH tF16D tF32D tF32S tF32H tF32WL Description C2o pulse width high or low C4o pulse width high or low C8o pulse width high or low C16o pulse width high or low C32o pulse width high TSP pulse width high RSP pulse width high F0o pulse width low F8o pulse width high F16o pulse width low Output clock and frame pulse rise or fall time Input Controls Setup Time Input Controls Hold Time F8o to F16o delay F8o to F32o delay F32o setup to C32o falling F32o hold to C32o falling F32o pulse width low 100 100 27.1 12 11 11 30.6 30.1 15.8 33.1 19 Min Typ 244 122 61 30.5 14.4 486 490 243 123.6 60.9 3 Max Units ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns Test Conditions
tR8D
Fref0/Fref1 8 kHz Fref0/Fref1 1.544 MHz
tRW tR15D tRW tR2D tRW
VT VT
Fref0/Fref1 2.048 MHz
VT
F8o
VT
Figure - 11 Input to Output Timing (Normal Mode)
25
IDT82V3002A WAN PLL WITH DUAL REFERENCE INPUTS
INDUSTRIAL TEMPERATURE RANGE
tF8WH F8o tF0WL F0o tF16D VT tF0D VT VT
tF16WL F16o tF16S tF32WL F32o tC32WH C32o tC16WL C16o tC8W C8o tC4W C4o tC2W C2o tC6W C6o C3o tC3W tC15W
Figure - 12 Output Timing 1
26
tF16H tF32D tF32H tC32D
VT
tF32S
VT tC16D VT tC8W tC8D VT tC4W tC4D
VT
tC2D VT
tC6W
tC6D VT tC3D tC15D VT VT
C1.5o
IDT82V3002A WAN PLL WITH DUAL REFERENCE INPUTS
INDUSTRIAL TEMPERATURE RANGE
F8o
VT VT
C2o tRSPD RSP tTSPW TSP VT tRSPW VT
tTSPD
Figure - 13 Output Timing 2
F8o
VT tS tH VT
MODE_sel0 MODE_sel1 TIE_en IN_sel
Figure - 14 Input Control Setup and Hold Timing
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IDT82V3002A WAN PLL WITH DUAL REFERENCE INPUTS
INDUSTRIAL TEMPERATURE RANGE
7
IDT
ORDERING INFORMATION
XXXXXXXX Device Type XX Package X Process/ Temperature Range
Blank
Industrial (-40 C to +85 C)
PV
Shrink Small Outline Package (SSOP, PV56)
82V3002A WAN PLL with Dual Reference Inputs
DATASHEET DOCUMENT HISTORY
10/22/2003 pgs. 7, 24, 25. CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054 for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com
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for Tech Support: email: telecomhelp@idt.com phone: 408-330-1552

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