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FS8108 Low Power Phase-Locked Loop IC
the wireless IC company
HiMARK Technology, Inc. reserves the right to change the product described in this datasheet. All information contained in this datasheet is subject to change without prior notice. HiMARK Technology, Inc. assumes no responsibility for the use of any circuits shown in this datasheet.
Description
The FS8108 is a serial data input, phase-locked loop IC with programmable input and reference frequency dividers. When combined with a VCO, the FS8108 becomes the core of a very low power frequency synthesizer well-suited for mobile communication applications such as paging systems. The FS8108 includes an 18-bit programmable input frequency divider and also implements a separate pin for stand-by control.
Features
High maximum input operating frequency -- 185 MHz at VDD1 = 1.0 V Up to 22 MHz internal crystal oscillator reference frequency at VDD1 = 1.0 V Extremely low current consumption (IDD,total typically 0.4 mA at fFIN = 90 MHz) 18-bit programmable input frequency divider (including a / 64/65 prescaler) with divide ratio range from 4032 to 262143 13-bit programmable reference frequency divider (including a / 8 prescaler) with divide ratio range from 40 to 65528 Optional lock detector output Charge pump output for passive low-pass filter Quick-lock signal output for faster locking Separate pin for stand-by control TSSOP 16L package (0.65mm pitch)
Applications
Pager Wireless communication system
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FS8108
the wireless IC company
Package and Pin Assignment: 16L, TSSOP
XIN XOUT VDD2 DB DO VSS FIN VDD1
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
TEST NC OPR LE DATA CLK LD NC
HiMARK FS8108
Dimensions in mm Symbols MIN. A A1 A2 b C D E E1 e L y --0.05 0.80 0.19 0.09 4.90 --4.30 --0.45 --0 NOM. ----1.00 ----5.00 6.40 4.40 0.65 0.60 ----MAX. 1.20 0.15 1.05 0.30 0.20 5.10 --4.50 --0.75 0.10 8 MIN. --0.002 0.031 0.007 0.004 0.193 --0.169 --0.018 --0
Dimensions in inch NOM. ----0.039 ----0.197 0.252 0.173 0.026 0.024 ----MAX. 0.048 0.006 0.041 0.012 0.008 0.201 --0.177 --0.030 0.004 8
Note: Tolerance + 0.1mm unless otherwise specified
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FS8108
the wireless IC company
Pin Descriptions
Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Name XIN XOUT VDD2 DB DO VSS FIN VDD1 NC LD CLK DATA LE OPR NC TEST I/O I O POWER O O GND I POWER NC O I I I I NC I Description Reference crystal oscillator or external clock input with internally biased amplifier (any external input to XIN must be ac-coupled) Reference crystal oscillator or external clock output Nominal 3.0 V supply voltage Single-ended quick-lock output for faster locking Single-ended charge pump output for passive low pass filter Ground VCO frequency input with internally biased input amplifier (any external input to FIN must be ac-coupled) Nominal 1.0 V supply voltage No connection Lock detector output (high when PLL is locked) Shift register clock input Serial data input Latch enable input Battery-save control input; normal operation when high, stand-by mode when low No connection Test mode control input with internal pull-down resistor
Block Diagram
FIN DATA CLK LE TEST OPR XIN XOUT
/ 64/65
N-COUNTER N-LATCH
LOCK DETECTOR
LD DO DB
CONTROL LOGIC
SHIFT REGISTER
PFD
CHARGE PUMP QUICKLOCK
R-LATCH /8 R-COUNTER
WINDOW GENERATOR
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FS8108
the wireless IC company
Absolute Maximum Ratings
VSS = 0 V
Parameter Supply voltage VDD2 Input voltage range Operating temperature range Storage temperature range Soldering temperature range Soldering time range VFIN TOPR TSTG TSLD tSLD VSS - 0.3 to VSS + 7.0 VSS - 0.3 to VDD + 0.3 -10 to 60 -40 to 125 255 10 V V
o
Symbol VDD1
Rating VSS - 0.3 to VSS + 2.0
Unit V
C C C
o
o
s
Recommended Operating Conditions
VSS = 0 V
Value Parameter Symbol min. VDD1 Supply voltage range VDD2 Operating temperature TA 2.0 -10 3.0 25 3.3 60 V
o
Unit typ. 1.0 max. 2.0 V 0.95
C
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FS8108
the wireless IC company
Electrical Characteristics
(VDD1 = 0.95 to 2.0 V, VDD2 = 2.7 to 3.3 V, VSS = 0 V, TA = 0 to 60C unless otherwise noted)
Value Parameter Symbol Condition min. VDD1 = 1.0 V, OPR="H", VFIN = 0.3 Vpk-pk sinusoid, fFIN = 100 MHz, VXIN = 0.3 Vpk-pk sinusoid, fXIN = 12.8 MHz VDD1 = 0 V, OPR="L" VFIN = 0.3 Vpk-pk sinusoid VFIN = 0.3 Vpk-pk sinusoid VXIN = 0.3 Vpk-pk sinusoid VXIN = 0.3 Vpk-pk sinusoid 0.3 0.3 0.3 VDD0.3 VIL = 0 V VIH = VDD1 VIL = 0 V VIH = VDD1 VOL = 0.4 V VOH = VDD2 - 0.4 V VOL = 0.4 V VOH = VDD2 - 0.4 V 1.0 1.0 0.1 0.1 2 2 2 10 10 60 60 22 7 100 40 typ. max. Unit
Current consumption
IDD,total
0.40
1.10
mA
Standby current consumption (IDD2) FIN max. operating frequency FIN min. operating frequency XIN max. operating frequency XIN min. operating frequency FIN input voltage swing XIN input voltage swing CLK, DATA, LE logic LOW input voltage CLK, DATA, LE logic HIGH input voltage XIN logic LOW input current XIN logic HIGH input current FIN logic LOW input current FIN logic HIGH input current DO logic LOW output current DO logic HIGH output current LD, FV, FR logic LOW output current LD, FV, FR logic HIGH output current DATA to CLK setup time CLK to LE setup time Hold time
IDD,standby fFIN,max fFIN,min fXIN,max fXIN,min VFIN VXIN VIL VIH IIL,XIN IIH,XIN IIL,FIN IIH,FIN IOL,DOP IOH,DOP IOL IOH tSU1 tSU2 tHOLD
10
A MHz MHz MHz MHz Vpk-pk Vpk-pk V V A A A A mA mA mA mA s s s
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Functional Description
Programmable Input Frequency Divider The VCO input to the FIN pin is divided by the programmable divider and then internally output to the phase/frequency detector (PFD) as fV. The programmable input frequency divider consists of a / 64/65 (P/P+1) dual-modulus prescaler and a 18-bit (N) counter, which is further comprised of a 6-bit swallow (A) counter, and a 12-bit main (B) counter. The total divide ratio, M, is related to values for P, A, and B through the relation
M = ( P + 1 ) x A + P x ( B - A ) = P x B + A,
with B A. The minimum programmable divisor for continuous counting is given by P x ( P - 1 ) = 64 x 63 = 4032, and the valid total divide ratio range for the input divider isM = 4032 to 262143. Programmable Reference Frequency Divider The crystal oscillator output is divided by the programmable divider and then internally output to the PFD as fR. The programmable reference frequency divider consists of a fixed / 8 (S) prescaler and a 13-bit reference (R) counter. The total divide ratio, T, is related to values for S and R through the relation
T = S x R = 8 x R.
The usable divisior range of the reference counter isR = 5 to 8191,and therefore, the valid total divide ratio range for the reference divider isT = 40 to 65528 (in steps of 8.) Serial Input Data Format The divide ratios for the input and reference dividers are input using a 19-bit serial interface consisting of separate clock (CLK), data (DATA), and latch enable (LE) lines. The format of the serial data is shown in Fig. 1. The data on the DATA line is written to the shift register on the rising edge of the CLK signal and is input with MSB first, and the last bit is used as the latch select control bit. The data on the DATA line should be changed on the falling edge of CLK, and LE should be held low while data is being written to the shift register. Data is transferred from the shift register to one of the frequency divider latches when LE is set high. When the latch select control bit is set low, data is loaded to the 18bit N-counter latch, and when the latch select control bit is set high, the 2 MSBs are
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ignored, the next 13 data bits are loaded to the 13-bit R-counter latch and the remaining 3 LSBs are used to control testing modes and should be set as follows for normal operation: R14 = high, R15 = low, R16 = low. To disable LD output (i.e. set LD low), R14 should be set low. Serial input data timing waveforms are shown in Fig. 2. Fig. 1 - Serial input data format
18-bit data for N-counter CONTROL BIT LSB
R16
R15
R14
13-bit data for R-counter
ignored
Fig. 2 - Serial input data timing waveforms
DATA
tSU1 tSU2
tHOLD
CLK
LE
CONTROL BIT
MSB
DATA
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19
CLK
LE
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LSB
MSB
June 2001
FS8108
the wireless IC company
Phase/Frequency Detector (PFD) The PFD compares an internal input frequency divider output signal, fV, with an internal reference frequency divider output signal, fR, and generates an error signal, DO, which is proportional to the phase error between fV and fR. The DO output is intended for use with a passive filter as shown in Fig. 3. The input/output waveforms for the PFD are shown in Fig. 4. Fig. 3 - Passive low-pass filter circuit
R1 DO R2 to VCO
C
Fig. 4 - PFD input/output waveforms
fR
fV high-Z DO high-Z high-Z
LD
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FS8108
the wireless IC company
Quick-lock Signal (DB) The quick-lock output signal, DB, is provided so that the PLL may achieve higher speed locking. When connected, the DB output effectively doubles the charge pump current output to the loop filter during the initial start-up of the PLL (when OPR first goes high). Once the PLL phase error is within a specific tolerance, the quick-lock circuitry sets the DB output to a high impedance state and the PLL continues toward lock with its normal charge pump current. Stand-by Mode The stand-by mode for the PLL is entered by setting the OPR pin low and VDD1 to 0 V while the circuit is in operation. In the stand-by mode, the XIN and FIN amplifiers, Ncounter, and R-counter are stopped, the N- and R-counters are also reset, and the DO and DB outputs are set to the high impedance state. As long as voltage is supplied to VDD2, data loaded to the latches is kept. To exit from stand-by mode to normal operation, the OPR pin must be set high and voltage must again be supplied to VDD1.
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FS8108
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Application Circuit
LNA
1st mixer
1st IF amplifier
2nd mixer
2nd IF amplifier Discriminator
Wave shaper
LPF
Frequency multiplier (x4,5) 2nd LO
1st LO XIN XOUT TEST NC RAM ROM
HiMARK
VDD2 DB DO VSS FIN VDD1
OPR LE DATA CLK LD NC
LCD driver
FS8108
CPU
Decoder
Driver LCD DC/DC converter
Page 10
June 2001

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