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19-2302; Rev 0; 1/02
MAX9124 Evaluation Kit
General Description
The MAX9124 evaluation kit (EV kit) contains a low-voltage differential signaling (LVDS) quad differential line driver (MAX9124) and receiver (MAX9125). The differential line driver accepts LVTTL or LVCMOS inputs and translates them to LVDS output signals. The receiver accepts LVDS inputs and translates them to singleended LVCMOS outputs. Both circuits operate with high data rates and low power dissipation. The MAX9124 EV kit is designed with 50 controlledimpedance traces in a four-layer PC board. It is specially designed for direct differential probing of the LVDS I/O. Connection points are provided for the attachment of a cable to carry the LVDS signals. The EV kit operates from a single 3.3V supply. In addition, a 1.2V power-supply input is provided for testing the driver's high-impedance propagation delays. A separate supply option for the driver and receiver allows testing of the common-mode performance of the receiver. The MAX9124 EV kit can also be used to evaluate the MAX9126, which is the same as the MAX9125 but with integrated 115 (nominal) termination resistors. Additional pads on the board are provided for dynamically driving the enable and disable control signals with a pulse generator.
Features
o Independent Quad Driver (MAX9124) and Quad Receiver (MAX9125/MAX9126) Circuits o >500Mbps (250MHz) Switching Rate (MAX9125/MAX9126) >800Mbps (400MHz) Switching Rate (MAX9124) o Supports Testing of Twisted-Pair Cables o 50 Controlled-Impedance Signal Traces o 16-Pin TSSOP Package o Fully Assembled and Tested
Evaluates: MAX9124/MAX9125/MAX9126
Ordering Information
PART MAX9124EVKIT TEMP RANGE 0C to +70C IC PACKAGE 16 TSSOP
Note: To evaluate the MAX9126, request a MAX9126EUE free sample with the MAX9124EVKIT.
Component List
DESIGNATION QTY DESCRIPTION 10F 10%, 10V tantalum capacitors (case B) AVX TAJB106K010R or Kemet T494B106K010AS 1000pF 10%, 50V X7R ceramic chip capacitors (0402) Murata GRM36X7R102K050A 0.1F 10%, 16V X7R ceramic chip capacitors (0603) Murata GRM39X7R104K016A 5.1pF 0.1pF, 50V ceramic chip capacitors (0402) Murata GRM36COG5R1B050A 49.9 1% resistors (0402) Not installed, open resistor pads (0402) 100 1% resistors (0402) 2.0k 1% resistors (0603) 0 resistors (0603) DESIGNATION R41-R48 R49, R50 JU1-JU6, JU15-JU20 JU7-JU14 JU21-JU28 DEN, DEN, REN, REN DIN1-DIN4, RIN1- to RIN4-, RIN1+ to RIN4+ U1 U2 0 4 4 8 None None None None QTY 0 0 12 8 8 0 DESCRIPTION Not installed, open resistor pads (0603) Not installed, shorted resistor pads (0603) 3-pin headers 4-pin headers 2-pin headers Not installed, SMA edge-mount connectors SMA edge-mount connectors MAX9124EUE (16-pin TSSOP) MAX9125EUE (16-pin TSSOP) Shunts MAX9124 PC board MAX9124 EV kit data sheet MAX9124/MAX9125 data sheet
C1, C4, C9
3
C2, C11
2
C3, C5-C8, C10
6
C12-C23 R1, R2, R3, R5-R10, R12-R16, R18-R21, R23, R24 R4, R11, R17, R22 R25-R28 R29-R32 R33-R40
12
12 1 1 8 1 1 1
20
________________________________________________________________ Maxim Integrated Products
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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.
MAX9124 Evaluation Kit Evaluates: MAX9124/MAX9125/MAX9126
Component Suppliers
SUPPLIER AVX Kemet Murata PHONE 803-943-0690 408-986-0424 814-237-1431 FAX 803-626-3123 408-986-1442 814-238-0490
Follow the steps below to verify receiver circuit operation. Do not turn on the power supply until all connections are completed: 1) Verify that a shunt is across jumper JU16 (EN) pins 1 and 2. 2) Connect a scope probe across JU25 (OUT1) to observe the output signal. 3) Connect a function generator that provides square waves to the input of the receiver circuit (connect the noninverting signal to SMA connector RIN1+ and the inverting signal to SMA connector RIN1-) with the following settings: a) Frequency = 10MHz b) VIL = 1.10V, VIH = 1.30V c) Duty cycle = 50% 4) Connect a 3.3V, 400mA power supply to the VCC2 pad. Connect the supply ground to the GND pad closest to VCC2. 5) Turn on the power supply and enable the function generator, then verify the output signal (OUT1) on the scope. Note: For connections to verify every channel, see Table 3.
Note: Please indicate that you are using the MAX9124/MAX9125/ MAX9126 when contacting these component suppliers.
Quick Start
The MAX9124 EV kit is a fully assembled and tested surface-mount board. The EV kit contains an LVDS differential line driver located on the upper-half circuit, and receiver located on the lower-half circuit. Recommended equipment includes: * DC power supplies: one 3.3V 0.3V, 400mA (or two 3.3V 0.3V, 200mA supplies for powering the driver and receiver independently with R49 and R50 shorts cut open) Signal generator for LVDS signal input (e.g., HP 8131A) Differential probe (e.g., Tektronix P6248) Digital sampling oscilloscope or logic analyzer (e.g., Tektronix 11801C)
* * *
Detailed Description
The MAX9124 EV kit is a fully assembled and tested circuit board that includes a quad LVDS differential line driver and receiver. The EV kit has two independent circuits. The upper-half circuit is a driver circuit and the lower-half circuit is a receiver circuit. The two circuits can be operated together or separately. Both circuits' I/Os are specially designed for direct probing. The EV kit is a four-layer PC board with 50 controlledimpedance traces for all input signal traces with 49.9 termination resistors. The two circuits can be linked by connecting an output signal from the driver circuit to the input of the receiver circuit. Each differential input pair traces are laid out with less than 100mil length difference.
Evaluating the Driver (MAX9124) Circuit
Follow the steps below to verify driver circuit operation. Do not turn on the power supply until all connections are completed: 1) Verify that a shunt is across pins 1 and 2 of JU2 (EN). 2) Connect a differential probe across pins 2 and 3 of JU7. 3) Connect a function generator that provides a square wave to the input of the driver circuit SMA connector DIN1 with the following settings: a) Frequency = 10MHz b) VIL = 0.00V, VIH = 3.00V c) Duty cycle = 50% 4) Connect a 3.3V, 400mA power supply to the VCC1 pad. Connect the supply ground to the GND pad closest to VCC1. 5) Turn on the power supply, enable the function generator, and verify the differential output signal VOD = (OUT1+ - OUT1-). Note: For connections to verify every channel, see Table 2.
Using Separate Power Supplies
The MAX9124 EV kit contains two separate circuits that can be operated with independent supplies after cutting open the shorts at R49 and R50. Independent power and ground planes allow measurements of the receivers' response to ground shift or other commonmode effects. Each circuit requires a 3.3V, 200mA power supply. In addition, if high-impedance delay testing is to be performed, a 1.2V voltage supply is required.
Evaluating the Receiver (MAX9125) Circuit
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MAX9124 Evaluation Kit
Input Signal
The MAX9124 EV kit provides internal DC or external AC input signals to the driver circuit and two kinds of input media, SMA coax or twisted-pair cable, to the receiver circuit. Driver Circuit Input The MAX9124 EV kit accepts both internal (DC) and external (AC) inputs to the driver circuit. Before driving AC external input signals to DIN1-DIN4 to the driver circuit, verify there are no shunts across JU1, JU3, JU4, and JU6 (Table 1). JU1, JU3, JU4, and JU6 can create DC internal input signals to the driver. To use JU1, JU3, JU4, and JU6 to create DC input signals, make sure termination resistors R1, R7, R8, and R14 are removed. Receiver Circuit Input The MAX9124 EV kit also provides two interconnect options to the receiver circuit: coaxial cable and twisted-pair cable. When 49.9 termination resistors R15, R16, R18-R21, and R23, R24 are installed, the fail-safe feature is disabled. To test the fail-safe feature, remove termination resistors R15, R16, R18-R21, and R23, R24. Additional paired testing points (IN1+, IN1-) (IN2+, IN2-) (IN3+, IN3-) (IN4+, IN4-) are provided for the twisted-pair cable connections. When twisted-pair cables are used as the input media (twisted-pair cables are soldered on testing points IN1-, IN1+, etc.), remove all 0 resistors R33-R40 to avoid signal reflection from the traces that connect 0 resistors to SMA connectors.
Evaluates: MAX9124/MAX9125/MAX9126
Output Signal
The MAX9124 EV kit is designed for direct probing of all output signals. Additional paired testing points (DOUT1-, DOUT1+), (DOUT2+, DOUT2-), (DOUT3+, DOUT3-), (DOUT4+, DOUT4-) are also provided for connection of twisted-pair cables and probing of the driver outputs.
Table 1. Using JU1, JU3, JU4, and JU6 to Provide Input Signals to the Driver Circuit
JUMPER SHUNT LOCATION 1 and 2 2 and 3 1 and 2 2 and 3 1 and 2 2 and 3 1 and 2 2 and 3 IN PIN Connected to VCC Connected to GND Connected to VCC Connected to GND Connected to VCC Connected to GND Connected to VCC Connected to GND DRIVER INPUT SIGNAL IN1 = high IN1 = low IN2 = high IN2 = low IN3 = high IN3 = low IN4 = high IN4 = low
Probing Connections
The MAX9124 EV kit is designed for direct differential probing connections. Tables 2 and 3 list the direct probing connections on the respective pins for all input and output signals and their respective testing points.
Enable/Disable
The MAX9124 EV kit has two enables and two disables. All enables and disables can be controlled by either jumpers or external signals. Jumpers JU2, JU5, JU16, and JU19 provide a DC logic signal to driver's EN and EN and receiver's EN and EN, respectively (Table 4). Table 5 is the enable/disable truth table. The EV kit can also be controlled by external enable/disable signal(s). To use external signals to control enable and disable, SMA connectors need to
JU1 JU3 JU6 JU4
Table 2. Driver Probing Connections
CHANNEL NAME Channel 1 Channel 2 Channel 3 Channel 4 IC OUTPUT PIN NAME OUT1+ OUT1OUT2+ OUT2OUT3+ OUT3OUT4+ OUT4TESTING POINT DOUT1+ DOUT1DOUT2+ DOUT2DOUT3+ DOUT3DOUT4+ DOUT4PROBING HEADER (4 PIN), PIN NO. JU7, pins 2 (+) and 1 (-) JU7, pins 3 (+) and 4 (-) JU8, pins 2 (+) and 1 (-) JU8, pins 3 (+) and 4 (-) JU10, pins 2 (+) and 1 (-) JU10, pins 3 (+) and 4 (-) JU9, pins 2 (+) and 1 (-) JU9, pins 3 (+) and 4 (-) PROBING (OUT+ - OUT-) JU7, pins 2 (+) and 3 (-) JU8, pins 3 (+) and 2 (-) JU10, pins 3 (+) and 2 (-) JU9, pins 2 (+) and 3 (-)
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MAX9124 Evaluation Kit Evaluates: MAX9124/MAX9125/MAX9126
Table 3. Receiver Probing Connections
CHANNEL NAME Channel 1 Channel 2 Channel 3 Channel 4 IC OUTPUT PIN NAME IN1IN1+ IN2+ IN2IN3IN3+ IN4+ IN4TESTING POINT IN1IN1+ IN2+ IN2IN3IN3+ IN4+ IN4PROBING HEADER (4 PIN), PIN NO. JU11, pins 2 (+) and 1 (-) JU11, pins 3 (+) and 4 (-) JU12, pins 2 (+) and 1 (-) JU12, pins 3 (+) and 4 (-) JU14, pins 3 (+) and 4 (-) JU14, pins 2 (+) and 1 (-) JU13, pins 3 (+) and 4 (-) JU13, pins 2 (+) and 1 (-) OUTPUT SIGNAL OUT1 OUT2 OUT3 OUT4 PROBING HEADER (2 PIN) JU25 JU26 JU28 JU27
be added on DEN, REN, DEN, and REN pads with 49.9 termination resistors R4, R17, R11, and R22. Before connecting external signals to DEN, REN, DEN, REN, verify there are no shunts across jumpers JU4, JU17, JU11, and JU22.
generator(s) to the driver input(s), and probe at receiver or driver I/Os. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed: 1) Verify shunts across jumper JU2 (DEN) and JU16 (REN) pins 1 and 2. 2) Connect a function generator to the driver input DIN1 with the following settings: a) Frequency = 10MHz b) VIL = 0.00V, VIH = 3.00V c) Duty cycle = 50% 3) Connect a scope probe across jumper JU25 (OUT1). Use 100 twisted-pair cable to connect the driver outputs to the receiver inputs as shown in Figure 1. 4) Single power supply (for the normal operation): Connect a 3.3V, 400mA power supply to VCC1. Connect the supply ground to the GND pad closest to VCC1. Optional separate power supplies (for testing receiver common-mode response): Connect 3.3V, 200mA power supplies to VCC1 and VCC2. Connect the supply grounds to the GND pads closest VCC1 and VCC2, respectively. Be sure R49 and R50 shorts are cut open. 5) Turn on the power supply (supplies), enable the function generator, and verify the output. Note: For connections to verify every channel, see Tables 2 and 3.
Evaluating Driver and Receiver Together
Table 4. JU2, JU5, JU16, and JU19 Setting and Enable/Disable Logic Level
JUMPER JU2, JU5, JU16, JU19 SHUNT LOCATION 1 and 2, connected to VCC 2 and 3, connected to GND Open, no shunt ENABLE/DISABLE LOGIC LEVEL High Low Float
Table 5. Enable and Disable Truth Table
DEN (REN) Low DEN (REN) High OPERATION FUNCTION U1 (U2) disable U1 (U2) enable
All other combinations (including floating)
To evaluate the LVDS differential line driver (MAX9124) and receiver (MAX9125) together, remove 0 resistors R33-R40 at the input of the receiver circuit, and remove capacitors C12-C19 and 49.9 termination resistors R2, R3, R5, R6, R9, R10, R12, and R13 at the output of the driver. Use 100 twisted-pair cable (such as CAT5) to connect the driver outputs to the receiver inputs. Connect one end of the twisted-pair cable to test point DOUT1- and another end to IN1-, etc. Connect function
Evaluating MAX9126
The MAX9124 EV kit can also evaluate the MAX9126, a differential line receiver with 115 internal termination
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MAX9124 Evaluation Kit Evaluates: MAX9124/MAX9125/MAX9126
MAX9124
DOUT1+ DIN1 DOUT1IN1IN1+ 100
MAX9125
OUT1
DOUT2+ DIN2 DOUT2-
IN2+ 100 IN2OUT2
DOUT3+ DIN3 DOUT3-
IN3+ 100 IN3OUT3
DOUT4+ DIN4 DOUT4-
IN4+ 100 IN4OUT4
DRIVER CIRCUIT (UPPER-HALF CIRCUIT)
RECEIVER CIRCUIT (LOWER-HALF CIRCUIT)
Figure 1. Twisted-Pair Cable Interconnect Diagram
resistors. To evaluate the MAX9126, replace MAX9125EUE with a MAX9126EUE and remove the external 100 resistors R25 to R28.
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Evaluates: MAX9124/MAX9125/MAX9126
MAX9124 Evaluation Kit
Figure 2. MAX9124 EV Kit Schematic (Driver Circuit)
VCC1 1 2 JU1 1 IN1 VCC VCC1 U1 GND VCM SMA 2 C4 10F 10V GND VCM DIN4 1 C2 1000pF C3 0.1F C1 10F 10V 16 VCC1 3
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MAX9124
IN4 2 3 R8 49.9 1% 15 JU4 1 2 OUT1+ VCM R45 OPEN R2 49.9 1% DOUT4+ OUT4+ VCM 1 2 C7 0.1F 3 JU9 4 DOUT4C17 5.1pF R9 49.9 1% R10 49.9 1% JU2 4 EN VCC1 DOUT3+ EN SMA 2 2 3 R11 OPEN 5 VCM 1 2 C6 0.1F JU22 OUT3R6 49.9 1% 6 OUT2+ VCC1 DIN3 JU6 JU3 7 IN2 GND IN3 9 8 1 2 3 1 2 R14 49.9 1% SMA OUT3+ VCC1 10 11 R46 OPEN R5 49.9 1% OUT212 1 JU5 1 DEN VCM R12 49.9 1% R48 OPEN 1 2 C8 0.1F 3 JU24 R13 49.9 1% 4 DOUT3C19 JU10 5.1pF C18 5.1pF OUT413 JU23 R47 OPEN C16 5.1pF 14 1 2 C5 0.1F JU21 R3 49.9 1% 3 VCC1 OUT1VCC1 R49 SHORT VCC2 R50 SHORT 1 2 3 1 2 3
DIN1
SMA
1
2
R1 49.9 1%
DOUT1+
C12 5.1pF
DOUT1-
JU7 3 C13 5.1pF 4
DEN
SMA
1
2
R4 OPEN
DOUT2-
C14 5.1pF
DOUT2-
JU8 3 C15 5.1pF 4
DIN2
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SMA
1
2
R7 49.9 1%
SMA IN11 2 VCC C11 1000pF C10 0.1F GND 2 IN1+ 1 R37 0 IN4+ R20 49.9 1% RIN4SMA 2 C9 10F 10V JU11 IN1+ R34 0 3 4 R25 100 1% 1 IN116 R33 0 VCC2
RIN11
2
R15 49.9 1%
SMA R29 2k 1% IN4- 15 R27 100 3 1% IN4+ 4 R38 0 IN41 U2 RIN4+ SMA 2 R31 2k 1% 3 OUT1+ C20 5.1pF JU25 14 JU13 VCC2 JU18 1 2 3 R43 OPEN 1 2 R41 OPEN
RIN1+ 1
2
R16 49.9 1%
VCC2
1 JU15 2 3
Figure 3. MAX9124 EV Kit Schematic (Receiver Circuit)
VCC2
MAX9125
4 EN OUT4 VCC2 JU27 EN R22 OPEN R42 OPEN OUT3 5 OUT2 R39 0 IN3+ C21 5.1pF JU26 IN3+ R28 100 3 1% IN3- 9 4 1 2 IN2+ JU12 7 IN2GND 8 IN2+ R36 0 3 4 R26 100 1% 6 JU14 R40 0 IN3R35 0 10 1 2 11 1 R23 49.9 1% RIN3+ 2 SMA RIN31 12 2 JU19 1 2 3 1 REN SMA 13 2 3
R21 49.9 1%
REN
SMA
1
JU16 1
2
R17 OPEN
C22 5.1pF
VCC2 R32 2k 1% R44 OPEN JU20 1 2 3
VCC2 R30 2k 1%
1 JU17 2 3
JU28
C23 5.1pF
SMA 2 R24 49.9 1%
SMA IN2-
RIN2+ 1
2
R18 49.9 1%
SMA
RIN21
MAX9124/MAX9125/MAX9126
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2
R19 49.9 1%
MAX9124 Evaluation Kit
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MAX9124 Evaluation Kit Evaluates: MAX9124/MAX9125/MAX9126
1.0"
1.0"
Figure 4. MAX9124 EV Kit PC Component Placement Guide--Component Side
Figure 5. MAX9124 EV Kit PC Board Layout--Component Side
1.0"
Figure 6. MAX9124 EV Kit PC Board Layout--Inner Layer 2
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MAX9124 Evaluation Kit MAX9124/MAX9125/MAX9126
1.0"
1.0" 1.0"
Figure 7. MAX9124 EV Kit PC Board Layout--Inner Layer 3
Figure 8. MAX9124 EV Kit PC Board Layout--Solder Side
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.
9 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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