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19-2319; Rev 0; 1/02
MAX9121 Evaluation Kit
General Description
The MAX9121 evaluation kit (EV kit) contains a flowthrough low-voltage differential signaling (LVDS) quad differential line driver (MAX9123) and receiver (MAX9121). 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 single-ended LVCMOS outputs. Both circuits operate with high data rates and low power dissipation. The MAX9121 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 MAX9121 EV kit can also be used to evaluate the MAX9122, which is the same as the MAX9121 but with integrated 107 (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 Driver (MAX9123) and Quad Receiver (MAX9121/MAX9122) Circuits o >500Mbps (250MHz) Switching Rate (MAX9121/MAX9122) o >800Mbps (400MHz) Switching Rate (MAX9123) o Supports Testing of Twisted-Pair Cables o 50 Controlled-Impedance Traces o 16-Pin TSSOP Package o Fully Assembled and Tested
Evaluates: MAX9121/MAX9122/MAX9123
Ordering Information
PART MAX9121EVKIT TEMP RANGE 0C to +70C IC PACKAGE 16 TSSOP
Note: To evaluate the MAX9122, request a MAX9122EUE free sample with the MAX9121EVKIT.
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
Note: Please indicate that you are using the MAX9121/MAX9122/ MAX9123 when contacting these component suppliers.
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 10pF 0.1pF, 50V ceramic chip capacitors (0402) Murata GRM36COG100B050A Not installed, open resistor pads (0402) 49.9 1% resistors (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-DIN 4, RIN1- to RIN4-, RIN1+ to RIN4+ U1 U2 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 MAX9123EUE (16-pin TSSOP) MAX9121EUE (16-pin TSSOP) Shunts (JU1, JU6, JU15-JU20) MAX9121 PC board MAX9121 EV kit data sheet MAX9121/MAX9122 data sheet
C1, C4, C9
3
C2, C11
2
C3, C5-C8, C10 C12-C23 R1, R6, R23, R24 R2-R5, R7-R22 R25-R28 R29-R32 R33-R40
6
12
12 1 1 8 1 1 1
0 20 4 4 8
________________________________________________________________ Maxim Integrated Products
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MAX9121 Evaluation Kit Evaluates: MAX9121/MAX9122/MAX9123
Quick Start
The MAX9121 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.
Evaluating the Driver (MAX9123) 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 jumper JU1 (EN) pins 1 and 2. 2) Connect a differential probe across pins 2 and 3 of jumper JU7. 3) Connect a 3.3V, 400mA power supply to the VCC1 pad. Connect the supply ground to the GND pad closest to VCC1. 4) Connect a function generator that provides a square wave to the input of the driver circuit SMA connector DIN1 with the following setting: a) Frequency = 10MHz b) VIL = 0.00V, VIH = 3.00V c) Duty cycle = 50% 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.
Recommended Equipment
* DC power supplies: One 3.3V 0.3V, 400mA or Two 3.3V 0.3V, 200mA supplies for operating the driver and receiver with independent supplies (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)
Table 1. Input Signals to Driver Circuit Using JU2 to JU5
JUMPER JU2 JU3 JU4 JU5 SHUNT LOCATION 1 and 2 connected to VCC 2 and 3 connected to GND 1 and 2 connected to VCC 2 and 3 connected to GND 1 and 2 connected to VCC 2 and 3 connected to GND 1 and 2 connected to VCC 2 and 3 connected to GND DRIVER INPUT SIGNAL IN1 = high IN1 = low IN2 = high IN2 = low IN3 = high IN3 = low IN4 = high IN4 = low
Evaluating the Receiver (MAX9121) Circuit
Follow the steps below to verify receiver circuit operation. Do not turn on the power supply until all connections are completed: 1) Verify that the shunt is across jumper JU15 (EN) pins 1 and 2. 2) Connect a scope probe across JU25 (OUT1) to observe the output signal. 3) Connect a 3.3V, 400mA power supply to the VCC2 pad. Connect the supply ground to the GND pad closest to VCC2.
Table 2. Driver Probing Connections
CHANNEL NAME Channel 1 Channel 2 Channel 3 Channel 4 IC OUTPUT PIN NAME OUT1OUT1+ OUT2+ OUT2OUT3OUT3+ OUT4+ OUT4TESTING POINT DOUT1DOUT1+ DOUT2+ DOUT2DOUT3DOUT3+ DOUT4+ 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 (-) JU9, pins 2 (+) and 1 (-) JU9, pins 3 (+) and 4 (-) JU10, pins 2 (+) and 1 (-) JU10, pins 3 (+) and 4 (-) PROBING (OUT+ - OUT-) JU7, pins 3 (+) and 2 (-) JU8, pins 2 (+) and 3 (-) JU9, pins 3 (+) and 2 (-) JU10, pins 2 (+) and 3 (-)
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MAX9121 Evaluation Kit Evaluates: MAX9121/MAX9122/MAX9123
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 (-) JU13, pins 2 (+) and 1 (-) JU13, pins 3 (+) and 4 (-) JU14, pins 2 (+) and 1 (-) JU14, pins 3 (+) and 4 (-) OUTPUT SIGNAL OUT1 OUT2 OUT3 OUT4 PROBING HEADER (2 PIN) JU25 JU26 JU27 JU28
4) 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 setting: a) Frequency = 10MHz b VIL = 1.10V, VIH = 1.30V c) Duty cycle = 50% 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.
power supply. In addition, if high-impedance delay testing is to be performed, a 1.2V voltage supply is required.
Input Signals
The MAX9121 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 MAX9121 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 JU2-JU5 (Table 1). JU2-JU5 can create DC internal input signals to the driver. To use JU2-JU5 to create DC input signals, make sure termination resistors R2-R5 are removed. Receiver Circuit Inputs The MAX9121 EV kit also provides two kinds of input media to the receiver circuit: SMA connector and twisted-pair cable. Additional paired testing points (IN1+, IN1-) (IN2+, IN2) (IN3+, IN3-) (IN4+, IN4-) are provided for the twisted-pair cable connections. When twistedpair cables are used as the input media (twisted-pair cables are soldered on testing points IN1-, IN1+...), remove all 0 resistors R33-R40 to avoid signal reflection from the traces that connect 0 resistors to SMA connectors.
Detailed Description
The MAX9121 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.
Using Separate Power Supplies
The MAX9121 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
Output Signals
The MAX9121 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.
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MAX9121 Evaluation Kit Evaluates: MAX9121/MAX9122/MAX9123
Probing Connections
The MAX9121 EV kit is designed for direct differential probing connections. Table 2 lists the direct probing connections on the respective pins for all input and output signals and their respective testing points. Table 3 lists the receiver probing connections. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed: 1) Verify that shunts are across JU1 and JU15 pins 1 and 2. 2) Connect function generator to the driver input DIN1 with the following setting: 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(ies), enable the function generator, and verify the output. Note: For connections to verify every channel, see Tables 2 and 3.
Enable/Disable
The MAX9121 EV kit has two enables and two disables. All enables and disables can be controlled by either jumpers or external signals. Jumpers JU1, JU6, JU15, and JU20 provide a DC logic signal to drivers EN, EN, and receivers EN and EN, respectively (Table 4). 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 be added on DEN, REN, DEN, and REN pads with 49.9 termination resistors R1, R6, R23, and R24. Before connecting external signals to DEN, REN, DEN, and REN, verify there are no shunts across jumpers JU1, JU6, JU15, and JU20.
Evaluating Driver and Receiver Together
To evaluate LVDS differential line driver (MAX9123) and receiver (MAX9121) together, remove 0 resistors R33-R40 at the input of the receiver circuit, and remove capacitors C16-C23 and 49.9 termination resistors R7-R14 at the output of the driver. Use 100 twistedpair cable (such as CAT-5) 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- together, etc. Connect function generator(s) to driver input(s), and probe at receiver or driver I/Os.
Evaluating the MAX9122
The MAX9121 EV kit can also evaluate the MAX9122, a differential line receiver with 107 internal termination resistors. To evaluate the MAX9122, replace MAX9121EUE with a MAX9122EUE and remove the external 100 resistors R25-R28.
Table 4. JU1, JU6, JU15, and JU20 Setting and Enable/Disable Logic Level
JUMPER JU1, JU6, JU15, JU20 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) High High DEN (REN) Low Float OPERATION FUNCTION U1 (U2) enable U1 (U2) enable U1 (U2) disable
All other combinations
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MAX9121 Evaluation Kit Evaluates: MAX9121/MAX9122/MAX9123
MAX9123
DOUT1+ DIN1 DOUT1DOUT2+ DIN2 DOUT2DOUT3+ DIN3 DOUT3DOUT4+ DIN4 DOUT4IN4IN3IN4+ 100 IN2IN3+ 100 IN1IN2+ 100 IN1+ 100
MAX9121
OUT1
OUT2
OUT3
OUT4
DRIVER CIRCUIT (UPPER-HALF CIRCUIT)
RECEIVER CIRCUIT (LOWER-HALF CIRCUIT)
Figure 1. Twisted-Pair Cable Interconnect Diagram
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MAX9121 Evaluation Kit Evaluates: MAX9121/MAX9122/MAX9123
VCC1 DOUT1DEN SMA 1 2 R1 OPEN VCC1 DIN1 SMA 1 JU2 2 3 R2 49.9 1% VCC1 DIN2 SMA 1 JU3 2 3 R3 49.9 1% OUT2+ R8 49.9 1% OUT1+ 15 DOUT2+ 14 R9 49.9 1% R10 49.9 1% OUT2C1 10F 10V 4V CC C2 1000pF C3 0.1F VCC1 DIN3 SMA 1 JU4 2 3 R4 49.9 1% VCC1 DIN4 SMA 1 JU5 2 3 R5 49.9 1% VCC1 DEN SMA 1 JU6 2 3 R6 OPEN OUT4+ 10 R13 49.9 1% R14 49.9 1% 8 EN OUT49 R48 OPEN JU24 VCM 1 2 3 4 C22 10pF JU10 C23 10pF DOUT45 GND OUT312 R11 49.9 1% R12 49.9 1% OUT3+ 11 DOUT4+ 7 IN4 R47 OPEN JU23 VCM 1 2 3 4 C20 10pF JU9 C21 10pF DOUT3+ 13 DOUT3R46 OPEN JU22 VCM 1 2 3 4 C18 10pF JU8 C19 10pF DOUT2R50 SHORT VCC1 R49 VCC2 SHORT 1 JU1 2 3 1 EN OUT116 R7 49.9 1% R45 OPEN JU21 VCM 1 2 3 4 C16 10pF JU7 C17 10pF DOUT1+ C4 10F 10V
C5 0.1F
VCM VCM
1 2
2 IN1
GND
1 2
3 IN2
U1
MAX9123
C6 0.1F
VCC1
GND
1 2
6 IN3
C7 0.1F
1 2
C8 0.1F
1 2
Figure 2. MAX9121 EV Kit Schematic (Driver Circuit) 6 _______________________________________________________________________________________
MAX9121 Evaluation Kit Evaluates: MAX9121/MAX9122/MAX9123
RIN1SMA
1 2 R15 49.9 1% IN1R33 0 1 1 2 3 4 JU11 R25 100 1% 2 IN1+ 16
VCC2 1 JU15 2 3 REN SMA R29 2k 1%
IN1-
EN
1 R23 OPEN 2
VCC2 1 JU16 2 3
IN1+ RIN1+ SMA 1 2 R16 49.9 1%
R34 0
R41 OPEN OUT1 15 R30 2k 1% VCC2 1 JU17 2 3 JU25 C12 10pF
RIN2+ SMA
1 2 R17 49.9 1% IN2+ R35 0 3 1 2 3 4 JU12 R26 100 1% 4 IN2VCC R18 49.9 1% 13 C11 1000pF R42 OPEN OUT2 14 JU26
IN2+
IN2RIN2SMA 1 2
R36 0
C13 10pF VCC2 C10 0.1F C9 10F 10V
U2
GND
12
GND
RIN3SMA
1 2 R19 49.9 1% IN3R37 0 5 1 2 3 4 JU13 R27 100 1% 6 IN3+
MAX9121
IN3-
R31 2k 1%
VCC2 1 JU18 2 3
R43 OPEN OUT3 11 JU27 C14 10pF R32 2k 1% VCC2 1 JU19 2 3
IN3+ RIN3+ SMA 1 2 R20 49.9 1%
R38 0
R44 OPEN OUT4 10 JU28 IN4+ R39 0 7 1 2 3 4 JU14 R28 100 1% 8 IN4EN 9 IN4+ VCC2 1 JU20 2 3 REN SMA C15 10pF
RIN4+ SMA
1 2 R21 49.9 1%
IN4RIN4SMA 1 2 R22 49.9 1%
R40 0
1 R24 OPEN 2
Figure 3. MAX9121 EV Kit Schematic (Receiver Circuit) _______________________________________________________________________________________ 7
MAX9121 Evaluation Kit Evaluates: MAX9121/MAX9122/MAX9123
1.0"
1.0"
Figure 4. MAX9121 EV Kit Component Placement Guide-- Component Side
Figure 5. MAX9121 EV Kit PC Board Layout--Component Side
1.0"
Figure 6. MAX9121 EV Kit PC Board Layout--Inner Layer 2
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MAX9121 Evaluation Kit Evaluates: MAX9121/MAX9122/MAX9123
1.0"
1.0"
Figure 7. MAX9121 EV Kit PC Board Layout--Inner Layer 3
Figure 8. MAX9121 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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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