View MAX4817ETE_4137472.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-3951; Rev 2; 1/07
High-Bandwidth, T1/E1, SPST Analog Switches
General Description
The MAX4815/MAX4816/MAX4817 high-bandwidth, low-on-resistance, quad-SPST analog switches are designed to serve as integrated T1/E1 protection switches for 1+1 and N+1 line-card redundancy applications. Each MAX4815/MAX4816/MAX4817 replaces four electromechanical relays, significantly reducing board space, simplifying PC board routing, and reducing power consumption. These devices operate with 3.3V or 5V dual supplies for applications requiring T1/E1 signal switching in the line side of the interface transformer. Internal voltage multipliers drive the analog switches, yielding excellent linearity and low 3.7 typical on-resistance within the T1/E1 analog signal range. This high-bandwidth (550MHz typical) family of products is optimized for low return loss and matched pulse template performance in T1/E1 long-haul and short-haul applications. The MAX4815/MAX4816/MAX4817 are available in a tiny 16-pin, 5mm x 5mm, thin QFN package and are specified over the extended -40C to +85C temperature range.
Features
Quad-SPST NO, NC, and NC/NO Configurations Dual-Supply Operation from 3.3V to 5V Single-Supply Operation from +6V to +11V Hot Insertion Tolerant with No DC Path to the Supplies Low On-Resistance, RON = 3.7 (typ) and 6 (max) Over 550MHz, -3dB Signal Bandwidth Excellent Crosstalk and Off-Isolation Performance Over the T1/E1 Signal Spectrum: 110dB Crosstalk Attenuation at 1MHz Low Current Consumption of 2mA (max) -40C to +85C Extended Temperature Range Space-Saving, 16-Pin, 5mm x 5mm Thin QFN
MAX4815/MAX4816/MAX4817
Applications
NC2
Pin Configurations
V+ TOP VIEW NC3 9 N.C. 10
T1/E1 Redundancy Switching Base Stations and Base-Station Controllers Add and Drop Multiplexers Multiservice Provisioning Platforms Edge Routers Multiservice Switches (MSSs) Digital Loop Carriers Industrial Applications Data Acquisition Telecom Signal Switching Test Equipment Avionics
12
11
COM2
IN2 IN1 COM1
13 14
8 7
COM3 IN3 IN4 COM4
MAX4815
15 16 6
+
*EP
5
1 NC1
2 V-
3 GND
4 NC4
THIN QFN (5mm x 5mm) *EXPOSED PADDLE CONNECTED TO V-
Pin Configurations continued at end of data sheet.
Ordering Information
PART MAX4815ETE+ MAX4816ETE+ MAX4817ETE+ TEMP RANGE -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 16 TQFN-EP* 16 TQFN-EP* 16 TQFN-EP* CONFIGURATION 4 x SPST NC 4 x SPST NO 4 x SPST NC/NO PKG CODE T1655-3 T1655-3 T1655-3
*EP = Exposed paddle. Devices are available in lead-free packaging.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
High-Bandwidth, T1/E1, SPST Analog Switches MAX4815/MAX4816/MAX4817
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND unless otherwise noted.) V+ ............................................................................-0.3V to +6V V- .............................................................................-6V to +0.3V V+ to V-...................................................................-0.3V to +12V IN_ ................................................................-0.3V to (V+ + 0.3V) NO_, NC_, COM_ ....................................................-12V to +12V NO_ to COM_, NC_ to COM_ ..................................-18V to +18V Continuous Current (NO_, NC_, COM_) ....................... 100mA Continuous Current (any other terminal) ..........................30mA Peak Current (NO_, NC_, COM_) (pulsed at 1ms, 10% duty cycle).................................300mA Continuous Power Dissipation (TA = +70C) 16-Pin Thin QFN 5mm x 5mm (derate 33.3mW/C above +70C) .............................................................2667mW Operating Temperature Range ......................... -40C to +85C Storage Temperature Range ........................... -65C to +150C Junction Temperature .....................................................+150C Lead Temperature (soldering, 10s) ............................... +300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS--Dual 3.3V Supplies
(V+ = +3.3V 10%, V- = -3.3V 10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER ANALOG SWITCH Fault-Free Analog Signal Range VCOM_ VNO_ VNC_ V+ = +3V, V- = -3V, ICOM_ = 30mA, VNO_ or VNC_ = +3V V+ = +3V, V- = -3V, ICOM_ = 30mA, VNO_ or VNC_ = +3V V+ = +3V, V- = -3V, ICOM_ = 30mA; VNO_ or VNC_ = -3V, 0V, +3V V+ = +3.6V, V- = -3.6V; VCOM_ = -3V, +3V; VNO_ or VNC_ = +3V, -3V TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 0.4 0.1 VV+ V SYMBOL CONDITIONS MIN TYP MAX UNITS
3.7
5 6 0.6 0.8 1.2 1.5
On-Resistance (Note 2)
RON
On-Resistance Match Between Channels (Notes 2, 3)
RON
On-Resistance Flatness (Notes 2, 4)
RFLAT(ON)
NO or NC Off-Leakage Current
INO_(OFF) INC_(OFF)
-10
+10
nA
COM Off-Leakage Current
V+ = +3.6V, V- = -3.6V; ICOM_(OFF) VCOM_ = -3V, +3V; VNO_ or VNC_ = +3V, -3V V+ = +3.6V, V- = -3.6V; VCOM_ = -3V, +3V; NO_ or NC_ unconnected
-10
+10
nA
COM On-Leakage Current FAULT Fault Analog Signal Range
ICOM_(ON)
-15
+15
nA
VCOM_
V+ = +3.3V, V- = -3.3V
-11
+11
V
2
_______________________________________________________________________________________
High-Bandwidth, T1/E1, SPST Analog Switches
ELECTRICAL CHARACTERISTICS--Dual 3.3V Supplies (continued)
(V+ = +3.3V 10%, V- = -3.3V 10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER NO or NC Off-Leakage Current COM Off-Leakage Current SYMBOL INO_ INC_ ICOM_ CONDITIONS V+ = +3.3V, V- = -3.3V; VNO_ or VNC_ = +11V, -11V; VCOM_ = -5.5V, +5.5V V+ = +3.3V, V- = -3.3V; VCOM_ = +11V, -11V; VNO_ or VNC_ = -5.5V, +5.5V RL = 50, f = 1.024MHz, Figure 4 RL = 50, f = 30MHz, Figure 4 VCOM_ to VNO_ or VNC_, RL = 50, f = 1.024MHz, Figure 4 VCOM_ to VNO_ or VNC_, RL = 50, f = 30MHz, Figure 4 RS = RL = 50, Figure 4 MIN -1 -1 TYP MAX +1 +1 UNITS A A
MAX4815/MAX4816/MAX4817
SWITCH DYNAMIC CHARACTERISTICS Crosstalk (Note 5) VCT1 VCT2 VISO1 Off-Isolation (Note 6) VISO2 On-Channel -3dB Bandwidth COM On-Capacitance COM Off-Capacitance NC/NO Off-Capacitance Charge Injection Fault Recovery Time Turn-On Time BW 110 77 60 dB 30 550 10 7 7 55 128 20 40 s TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 128 0.8 2.4 VIN = 0 or V+ -1 +1 0.5 40 1 s 1 s V V A MHz pF pF pF pC s dB
CON(COM_) f = 1MHz, Figure 5 COFF(COM_) f = 1MHz, Figure 5 COFF Q tREC tON f = 1MHz, Figure 5 CL = 1.0nF, VGEN = 0, RGEN = 0, Figure 3 VNO_, VNC_, VCOM_ = -11V VNO_ or VNC_ = +3V, RL = 300, CL = 35pF, Figure 2 VNO_ or VNC_ = +3V, RL = 300, CL = 35pF, Figure 2 TA = +25C
Turn-Off Time Power-Up Delay LOGIC INPUT (IN_) Input-Voltage Low Input-Voltage High Input Leakage Current POWER SUPPLY Quiescent Positive Supply Current Quiescent Negative Supply Current Negative Supply Voltage Positive Supply Voltage
tOFF tDEL VIL VIH IIN
I+ IVV+
V+ = +3.6V, V- = -3.6V, VIN_ = 0 or V+ V+ = +3.6V, V- = -3.6V, VIN_ = 0 or V+ -3.6 3.0
0.8 0.8
2 2 -3.0 3.6
mA mA V V
_______________________________________________________________________________________
3
High-Bandwidth, T1/E1, SPST Analog Switches MAX4815/MAX4816/MAX4817
ELECTRICAL CHARACTERISTICS--Dual 5V Supplies
(V+ = +5V 10%, V- = -5V 10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER ANALOG SWITCH Fault-Free Analog Signal Range VCOM_ VNO_ VNC_ RON V+ = +4.5V, V- = -4.5V, ICOM_ = 30mA, VNO_ or VNC_ = +3V V+ = +4.5V, V- = -4.5V, ICOM_ = 30mA, VNO_ or VNC_ = +3V V+ = +4.5V, V- = -4.5V, ICOM_ = 30mA; VNO_ or VNC_ = -3V, 0V, +3V V+ = +5.5V, V- = -5.5V; VCOM_ = -5V, +5V; VNO_ or VNC_ = +5V, -5V TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX -10 0.4 0.1 V3.7 V+ 5 6 0.6 0.8 1.2 1.5 V SYMBOL CONDITIONS MIN TYP MAX UNITS
On-Resistance (Note 2)
On-Resistance Match Between Channels (Notes 2, 3)
RON
On-Resistance Flatness (Notes 2, 4)
RFLAT(ON)
NO or NC Off-Leakage Current
INO_(OFF) INC_(OFF)
+10
nA
COM Off-Leakage Current
V+ = +5.5V, V- = -5.5V; ICOM_(OFF) VCOM_ = -5V, +5V; VNO_ or VNC_ = +5V, -5V V+ = +5.5V, V- = -5.5V; VCOM_ = -5V, +5V; NO_ or NO_ unconnected
-10
+10
nA
COM On-Leakage Current FAULT Fault Analog Signal Range
ICOM_(ON)
-15
+15
nA
VCOM_ VNO_ VNC_ INO_ INC_
V+ = +5V, V- = -5V
-11
+11
V
NO or NC Off-Leakage Current
V+ = +5V, V- = -5V; VNO_ or VNC_ = +11V, -11V; VCOM_ = -5.5V, +5.5V V+ = +5V, V- = -5V; VCOM_ = +11V, -11V; VNO_ or VNC_ = -5.5V, +5.5V RL = 50, f = 1.024MHz, Figure 4 RL = 50, f = 30MHz, Figure 4
-1
+1
A
COM Off-Leakage Current
ICOM_
-1
+1
A
SWITCH DYNAMIC CHARACTERISTICS Crosstalk (Note 5) VCT1 VCT2 110 77 dB
4
_______________________________________________________________________________________
High-Bandwidth, T1/E1, SPST Analog Switches
ELECTRICAL CHARACTERISTICS--Dual 5V Supplies (continued)
(V+ = +5V 10%, V- = -5V 10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER SYMBOL VISO1 Off-Isolation (Note 6) VISO2 On-Channel -3dB Bandwidth COM On-Capacitance COM Off-Capacitance NC/NO Off-Capacitance Charge Injection Fault Recovery Time Turn-On Time CONDITIONS VCOM_ to VNO_ or VNC_, RL = 50, f = 1.024MHz, Figure 4 VCOM_ to VNO_ or VNC_, RL = 50, f = 30MHz, Figure 4 MIN TYP 60 dB 30 550 10 7 7 55 128 20 40 40 0.5 1 1 128 0.8 2.4 VIN = 0 or V+ -1 +1 s s V V A s MHz pF pF pF pC s MAX UNITS
MAX4815/MAX4816/MAX4817
BW RS = RL = 50, Figure 4 CON(COM_) f = 1MHz, Figure 5 COFF(COM_) f = 1MHz, Figure 5 COFF Q tREC tON f = 1MHz, Figure 5 CL = 1.0nF, VGEN = 0, RGEN = 0, Figure 3 VNO_, VNC_, VCOM_ = -11V VNO_ or VNC_ = +3V, RL = 300, CL = 35pF, Figure 2 VNO_ or VNC_ = +3V, RL = 300, CL = 35pF, Figure 2 TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX
Turn-Off Time Power-Up Delay LOGIC INPUT (IN_) Input-Voltage Low Input-Voltage High Input Leakage Current POWER SUPPLY Quiescent Positive Supply Current Quiescent Negative Supply Current Negative Supply Voltage Positive Supply Voltage
tOFF tDEL VIL VIH IIN
I+ IVV+
V+ = +5.5V, V- = -5.5V, VIN_ = 0 or V+ V+ = +5.5V, V- = -5.5V, VIN_ = 0 or V+ -5.5 4.5
0.9 0.9
2 2 -4.5 5.5
mA mA V V
Note 1: Note 2: Note 3: Note 4:
All parameters are production tested at TA = +85C and guaranteed by design over specified temperature range. Guaranteed by design, not production tested. RON = RON(MAX) - RON(MIN). Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal range. Note 5: Between any two switches. Note 6: Off-isolation = 20 x log10 [VCOM_/(VNC_ or VNO_)], VCOM_ = output, VNC_ or VNO_ = input to OFF switch.
_______________________________________________________________________________________
5
High-Bandwidth, T1/E1, SPST Analog Switches MAX4815/MAX4816/MAX4817
Typical Operating Characteristics
(V+ = +3.3V, V- = -3.3V, TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. COM_ VOLTAGE
MAX4815 toc01
ON-RESISTANCE vs. COM_ VOLTAGE
MAX4815 toc02
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4815 toc03
6 DUAL 3.3V SUPPLIES 5 ON-RESISTANCE () 4 3 2 1 0 -3.3 -2.2 -1.1 0 1.1 2.2 TA = +85C TA = +25C TA = -40C
6 5
DUAL 5V SUPPLIES TA = +85C
1000
4 TA = +25C 3 2 1 0 TA = -40C
SUPPLY CURRENT (A) 3 5
ON-RESISTANCE ()
900
800
700
600 -5 -3 -1 1 3.0 3.5 4.0 4.5 5.0 5.5 COM_ VOLTAGE (V) DUAL-SUPPLY VOLTAGE (V)
3.3
COM_ VOLTAGE (V)
SUPPLY CURRENT vs. TEMPERATURE
MAX4815 toc04
NC/NO(OFF) LEAKAGE CURRENT vs. TEMPERATURE
520 480 440 400 360 320 280 240 200 160 120 80 40 0 -40 -40 DUAL 3.6V SUPPLIES 520 480 440 400 360 320 280 240 200 160 120 80 40 0 -40
MAX4815 toc05
NC/NO(OFF) LEAKAGE CURRENT vs. TEMPERATURE
DUAL 5.5V SUPPLIES
MAX4815 toc06
1000 950 SUPPLY CURRENT (A) 900 850 800 750 700 -40 -15 10 35 60 DUAL 5V SUPPLIES
LEAKAGE CURRENT (pA)
DUAL 3.3V SUPPLIES
NC_/NO_ = +3V, COM_ = -3V
LEAKAGE CURRENT (pA)
NC_/NO_ = +5V, COM_ = -5V
NC_/NO_ = -3V, COM_ = +3V
NC_/NO_ = -5V, COM_ = +5V
85
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
COM(OFF) LEAKAGE CURRENT vs. TEMPERATURE
MAX4815 toc07
COM(OFF) LEAKAGE CURRENT vs. TEMPERATURE
MAX4815 toc08
COM(ON) LEAKAGE CURRENT vs. TEMPERATURE
480 420 LEAKAGE CURRENT (pA) 360 300 240 180 120 60 0 -60 COM_ = -3V COM_ = +3V DUAL 3.6V SUPPLIES
MAX4815 toc09
360 320 280 LEAKAGE CURRENT (pA) 240 200 160 120 80 40 0 -40 -40 -15 10 35 60 NC_/NO_ = -3V, COM_ = +3V NC_/NO_ = +3V, COM_ = -3V DUAL 3.6V SUPPLIES
360 320 280 LEAKAGE CURRENT (pA) 240 200 160 120 80 40 0 -40 NC_/NO_ = -5V, COM_ = +5V NC_/NO_ = +5V, COM_ = -5V DUAL 5.5V SUPPLIES
540
85
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
6
_______________________________________________________________________________________
High-Bandwidth, T1/E1, SPST Analog Switches
Typical Operating Characteristics (continued)
(V+ = +3.3V, V- = -3.3V, TA = +25C, unless otherwise noted.)
COM(ON) LEAKAGE CURRENT vs. TEMPERATURE
480 420 LEAKAGE CURRENT (pA) 360 300 240 180 120 60 0 -60 -40 -15 10 35 60 85 TEMPERATURE (C) 0 -5 -3 -1 1 3 5 VCOM_ (V) -120 0.1 1 10 100 FREQUENCY (MHz) COM_ = -5V COM_ = +5V DUAL 5.5V SUPPLIES
MAX4815 toc10
MAX4815/MAX4816/MAX4817
CHARGE INJECTION vs. COMMON VOLTAGE
MAX4815 toc11
CROSSTALK vs. FREQUENCY
MAX4815 toc12
540
140 120 CHARGE-INJECTION (pC) 100 80 60 40 20
-40
-60 LOSS (dB)
-80
-100
FREQUENCY RESPONSE
MAX4815 toc13
OFF-ISOLATION vs. FREQUENCY
MAX4815 toc14
T1 (100) PULSE TEMPLATE TEST
MAX4815 toc15
0 -1 -2 LOSS (dB) -3 -4 -5 -6 -7 0.1 1 10 FREQUENCY (MHz) 100
20 0 -20 LOSS (dB) -40 -60 -80 -100
1.2 0.9 NORMALIZED AMPLITUDE 0.6 0.3 0 -0.3 -0.6
1000
0.1
1
10
100
-500
-300
-100
100 TIME (ns)
300
500
700
FREQUENCY (MHz)
T1 (100) SCOPE SHOT OF THE INPUT AND OUTPUT OF DEVICE
MAX4815 toc16
E1 (120) PULSE TEMPLATE TEST
1.1 NORMALIZED AMPLITUDE 0.9 0.7 0.5 0.3 0.1 -0.1 -0.3
MAX4815 toc17
E1 (120) SCOPE SHOT OF THE INPUT AND OUTPUT OF DEVICE
MAX4815 toc18
1.3
INPUT 1V/div
INPUT 1V/div
OUTPUT 1V/div
OUTPUT 1V/div -250 -200 -150 -100 -50 0 50 100 150 200 250 100ns/div
200ns/div
TIME (ns)
_______________________________________________________________________________________
7
High-Bandwidth, T1/E1, SPST Analog Switches MAX4815/MAX4816/MAX4817
Typical Operating Characteristics (continued)
(V+ = +3.3V, V- = -3.3V, TA = +25C, unless otherwise noted.)
E1 (75) PULSE TEMPLATE TEST
1.1 NORMALIZED AMPLITUDE 0.9 0.7 0.5 0.3 0.1 -0.1 -0.3 -250 -200 -150 -100 -50 0 50 100 150 200 250 100ns/div TIME (ns) OUTPUT 1V/div INPUT 1V/div
MAX4815 toc19
E1 (75) SCOPE SHOT OF THE INPUT AND OUTPUT OF DEVICE
MAX4815 toc20
1.3
Pin Description
PIN MAX4815 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 -- -- -- -- EP MAX4816 -- 2 3 -- 5 6 7 8 -- 10 11 -- 13 14 15 16 1 4 9 12 EP MAX4817 -- 2 3 -- 5 6 7 8 9 10 11 12 13 14 15 16 1 4 -- -- EP NAME NC1 VGND NC4 COM4 IN4 IN3 COM3 NC3 N.C. V+ NC2 COM2 IN2 IN1 COM1 NO1 NO4 NO3 NO2 EP FUNCTION Analog Switch Normally Closed Terminal 1 Negative Supply Voltage. Bypass V- to ground with a 0.1F ceramic capacitor. Ground Analog Switch Normally Closed Terminal 4 Analog Switch Common Terminal 4 Switch 4 Logic-Control Input Switch 3 Logic-Control Input Analog Switch Common Terminal 3 Analog Switch Normally Closed Terminal 3 No Connection. Not internally connected. Positive Supply Voltage. Bypass V+ to ground with a 0.1F ceramic capacitor. Analog Switch Normally Closed Terminal 2 Analog Switch Common Terminal 2 Switch 2 Logic-Control Input Switch 1 Logic-Control Input Analog Switch Common Terminal 1 Analog Switch Normally Open Terminal 1 Analog Switch Normally Open Terminal 4 Analog Switch Normally Open Terminal 3 Analog Switch Normally Open Terminal 2 Exposed Paddle. Connect exposed paddle to V- or leave unconnected.
8
_______________________________________________________________________________________
High-Bandwidth, T1/E1, SPST Analog Switches
Detailed Description
The MAX4815/MAX4816/MAX4817 are high-bandwidth, low-on-resistance, quad-SPST analog switches targeted to serve as integrated T1/E1 analog protection switches for 1+1 and N+1 line-card redundancy applications. These devices are designed to replace electromechanical relays to save board space, reduce power consumption, and simplify PC board routing. The devices allow the user to live insert the boards with no adverse effects. The MAX4815/MAX4816/MAX4817 support 3.3V or 5V dual-supply operation, which is required for E1/T1 signal switching in the line-side of the interface transformer. Internal voltage multipliers supply the switches yielding excellent linearity and low on-resistance, typically 3.7, within the E1/T1 analog signal range. This high-bandwidth, typically 550MHz, family of devices is optimized for low return loss and matched pulse template performance in E1/T1 short-haul and long-haul applications.
5V 10% 1:2
MAX4815/MAX4816/MAX4817
TTIP LIU Tx TRING
MAX4815 MAX4816 MAX4817 COM_ NC_
RL
10V 10% + Vo -
Figure 1. Fault Protection
unconnected or connected to GND. Therefore, the devices are not destroyed by a hot insertion. In order to guarantee data integrity, the V+ and V- supplies must be properly biased.
Applications Information
T1/E1 N+1 Redundancy
The MAX4815/MAX4816/MAX4817 are designed for adjacent line-card protection applications. Figures 6 and 7 show a basic architecture for twisted-pair interface (120 E1, or 100 T1). Coaxial cable interface (75 E1) can be illustrated with the same figures but without the single-ended-to-differential conversion stage. A single protection card can replace up to N line cards in a N+1 redundancy scheme. Figure 6 shows the MAX4815/ MAX4816/MAX4817 sitting in the line cards where they can reroute any of the input/output signals to a protection line card. Figure 7 shows the MAX4815/MAX4816/ MAX4817 sitting in a protection-switching card where the switches are always powered. These figures do not show the surge protection elements and resistors for line termination/impedance matching. The low on-resistance and high bandwidth of the MAX4815/MAX4816/MAX4817 yield good pulse template and return-loss performance (see the Typical Operating Characteristics). The pulse template tests for E1 (twisted pair interface 120 and coaxial interface 75) and T1 (twisted pair interface 100) were tested using the Dallas DS2155 single-chip transceiver evaluation board, and twelve switches in parallel with one switch closed and the other eleven open. The internal transmit termination feature must be disabled when using this circuit. To use the same transmit resistors for E1 twisted pair and coaxial cables, the transmit line build out control register (TLBC) is set to the value 6Ah. This sets the driver voltage so the output pulse has the right amplitude for both 120 (twisted pair) and 75 (coaxial) loads. The analog switches were powered with dual power supplies at 5V.
9
Analog Signal Levels
The on-resistance of the MAX4815/MAX4816/MAX4817 is very low and stable as the analog signals are swept from V- to V+ (see the Typical Operating Characteristics).
Fault Protection
The fault protection of the MAX4815/MAX4816/ MAX4817 allows the devices to handle input signals of more than twice the supply voltage without clamping the signal, latching up, or disturbing other cards in the system. The device detects when the input voltage drops below the negative supply. As soon as a fault condition is detected, the switch is immediately turned off for 128 clock cycles (typically 128s). At the end of the 128s timeout, the switch is turned back on for one clock cycle. At the end of the one clock cycle, if the signal is within the operating range, the switch will remain on. Otherwise, the device will turn the switch off again for 128 clock cycles. This will repeat until the signal is within the operating range. In T1/E1 redundancy applications, this can happen when the load resistor (RL) is removed or disconnected for any reason, as shown in Figure 1. Without a load resistor, the output voltage when using a 1:2 transformer can be as high as 11V.
Hot Insertion
The MAX4815/MAX4816/MAX4817 tolerate hot insertions, thus are not damaged when inserted into a live backplane. Competing devices can exhibit low impedance when plugged into a live backplane that can cause high power dissipation leading to damage of the device itself. The MAX4815/MAX4816/MAX4817 have relatively high input impedance when V+ and V- are
_______________________________________________________________________________________
High-Bandwidth, T1/E1, SPST Analog Switches MAX4815/MAX4816/MAX4817
Test Circuits/Timing Diagrams
V+ V+ 3V NO_ OR NC_ 3V VIN_ 0V VIN_ MAX4815 MAX4816 IN_ MAX4817 COM_ GND VVRL CL 3V VOUT VOUT 0V tOFF tON 50%
90%
90%
Figure 2. Switch Turn-On/Turn-Off Times
V+ VIN_ IN_ V+ RGEN NO_ OR NC_ VGEN VOUT CL VVOUT IS THE MEASURED VOLTAGE DUE TO CHARGETRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. Q = VOUT x CL VIN_ 0V COM_ VVOUT VOUT 3V
MAX4815 MAX4816 MAX4817 GND
Figure 3. Charge Injection
V+ 0.1F
50 RESISTOR ONLY NEEDED FOR CROSSTALK AND ISOLATION VIN 50 COM_
NETWORK ANALYZER 50
V+ V+ MAX4815 MAX4816 MAX4817
50 VOUT MEAS REF
IN_
NO_, NC_ GND V-
50 0.1F VMEASUREMENTS ARE STANDARDIZED AGAINST SHORT AND OPEN AT SOCKET TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND OFF NO_ OR NC_ TERMINALS. ON-RESPONSE IS MEASURED BETWEEN COM_ AND ON NO_ OR NC_ TERMINALS. CROSSTALK IS MEASURED FROM ONE CHANNEL TO ALL OTHER CHANNELS.
50
Figure 4. On-Loss, Off-Isolation, and Crosstalk
10
______________________________________________________________________________________
High-Bandwidth, T1/E1, SPST Analog Switches
Test Circuits/Timing Diagrams (continued)
V+ 0.1F
MAX4815/MAX4816/MAX4817
V+ NC_ (OR NO_) V+ MAX4815 MAX4816 MAX4817 COM_ V-
1MHz CAPACITANCE ANALYZER
IN_
GND
0.1F
V-
Figure 5. Channel Off-/On-Capacitance
______________________________________________________________________________________
11
High-Bandwidth, T1/E1, SPST Analog Switches MAX4815/MAX4816/MAX4817
LINE CARD 1
MAX4815 MAX4816 MAX4817
T1/E1 LIU Tx/Rx
I/O 1
LINE CARD 2
MAX4815 MAX4816 MAX4817
T1/E1 LIU Tx/Rx
I/O 2
LINE CARD N
MAX4815 MAX4816 MAX4817
T1/E1 LIU Tx/Rx
I/O N
PROTECTION LINE CARD
MAX4815 MAX4816 MAX4817
T1/E1 LIU Tx/Rx SINGLE-ENDED-TODIFFERENTIAL CONVERSION
BACKPLANE
Figure 6. Adjacent Line-Card Protection Architecture with Switches in the Line Cards for Twisted Pair Cable (120 E1, or 100 T1). Figure for coaxial cable (75 E1) is the same without the single-ended-to-differential conversion.
12
______________________________________________________________________________________
High-Bandwidth, T1/E1, SPST Analog Switches MAX4815/MAX4816/MAX4817
LINE CARD 1
MAX4815 MAX4816 MAX4817
T1/E1 LIU Tx/Rx
I/O 1
LINE CARD 2
MAX4815 MAX4816 MAX4817
T1/E1 LIU Tx/Rx
I/O 2
LINE CARD N
MAX4815 MAX4816 MAX4817
T1/E1 LIU Tx/Rx
I/O N
PROTECTION LINE CARD
MAX4815 MAX4816 MAX4817
T1/E1 LIU Tx/Rx SINGLE-ENDED-TODIFFERENTIAL CONVERSION
PROTECTION SWITCHING CARD
Figure 7. Adjacent Line-Card Protection Architecture with Switches out of the Line Cards for Twisted Pair Cable (120 E1, or 100 T1). Figure for coaxial cable (75 E1) is the same without the single-ended-to-differential conversion.
______________________________________________________________________________________
13
High-Bandwidth, T1/E1, SPST Analog Switches MAX4815/MAX4816/MAX4817
Pin Configurations (continued)
N.C. 10 NC2 N.C. NO2 NO3 TOP VIEW TOP VIEW NC3 9
V+
12
11
10
9
12
11
COM2
IN2 IN1 COM1
13 14
8 7
COM3 IN3 IN4 COM4
COM2
IN2 IN1 COM1
13 14
V+
8 7
COM3 IN3 IN4 COM4
MAX4816
15 16 6 15 16
MAX4817
6
+
*EP
5
+
*EP
5
1 NO1
2 V-
3 GND
4 NO4
1 NO1
2 V-
3 GND
4 NO4
THIN QFN (5mm x 5mm) *EXPOSED PADDLE CONNECTED TO V-
THIN QFN (5mm x 5mm) *EXPOSED PADDLE CONNECTED TO V-
Chip Information
PROCESS: BiCMOS CONNECT EXPOSED PADDLE TO V-.
14
______________________________________________________________________________________
High-Bandwidth, T1/E1, SPST Analog Switches
Typical Operating Circuit
. .. .. .
MAX4815/MAX4816/MAX4817
..
.
LINE CARD N
..
. ...
..
.
LINE CARD 2 LINE CARD 1 IN1 NO1 T1/E1 LIU Tx COM1 IN2 ZL NO2 COM2 IN3 NO3 NO4 T1/E1 LIU Rx ZL COM3 IN4 COM4 ZL TRANSMIT
MAX4816
ZL
RECEIVE
PROTECTION LINE CARD NO1 T1/E1 LIU Rx ZL
IN1 COM1
IN4 NO4 T1/E1 LIU Rx ZL COM4
MAX4816
ZL = 75, 100, OR 120
______________________________________________________________________________________
15
High-Bandwidth, T1/E1, SPST Analog Switches MAX4815/MAX4816/MAX4817
Functional Diagram
V+ IN1 NO1 COM1 IN2 NC2 COM2 IN3 NC3 COM3 IN4 NO4 COM4 V-
V+ IN1 NC1 COM1 IN2 NC2 COM2 IN3 NC3 COM3 IN4 NC4 COM4 VNO4 NO3 NO2 NO1
V+ IN1 COM1 IN2 COM2 IN3 COM3 IN4 COM4 V-
MAX4815
GND IN_ NC_ 0 ON 1 OFF
MAX4816
GND IN_ NO_ 0 OFF 1 ON
MAX4817
GND IN_ NC_ NO_ 0 ON OFF 1 OFF ON
16
______________________________________________________________________________________
High-Bandwidth, T1/E1, SPST Analog Switches
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
MAX4815/MAX4816/MAX4817
Revision History
Pages changed at Rev 2: 1, 9, 17
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 (c) 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
Boblet
QFN THIN.EPS

▲Up To Search▲

Price & Availability of MAX4817ETE

	To Download MAX4817ETE Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .