Evaluates: MAX9121/MAX9122/MAX9123 19-2319 Rev 0 1/02 MAX9121 Evaluation Kit General Description Features The MAX9121 evaluation kit (EV kit) contains a flow- Independent Driver (MAX9123) and Quad Receiver through low-voltage differential signaling (LVDS) quad (MAX9121/MAX9122) Circuits differential line driver (MAX9123) and receiver >500Mbps (250MHz) Switching Rate (MAX9121). The differential line driver accepts LVTTL or (MAX9121/MAX9122) LVCMOS inputs and translates them to LVDS output sig- >800Mbps (400MHz) Switching Rate (MAX9123) nals. The receiver accepts LVDS inputs and translates Supports Testing of Twisted-Pair Cables them to single-ended LVCMOS outputs. Both circuits 50 Controlled-Impedance Traces operate with high data rates and low power dissipation. 16-Pin TSSOP Package The MAX9121 EV kit is designed with 50 controlled- Fully Assembled and Tested impedance traces in a four-layer PC board. It is spe- cially designed for direct differential probing of the LVDS I/O. Connection points are provided for the Ordering Information attachment of a cable to carry the LVDS signals. PART TEMP RANGE IC PACKAGE The EV kit operates from a single 3.3V supply. In addi- tion, a 1.2V power-supply input is provided for testing the MAX9121EVKIT 0C to +70C 16 TSSOP drivers high-impedance propagation delays. A separate Note: To evaluate the MAX9122, request a MAX9122EUE free supply option for the driver and receiver allows testing of sample with the MAX9121EVKIT. the common-mode performance of the receiver. Component Suppliers The MAX9121 EV kit can also be used to evaluate the MAX9122, which is the same as the MAX9121 but with SUPPLIER PHONE FAX integrated 107 (nominal) termination resistors. AVX 803-943-0690 803-626-3123 Additional pads on the board are provided for dynami- Kemet 408-986-0424 408-986-1442 cally driving the enable and disable control signals with Murata 814-237-1431 814-238-0490 a pulse generator. Note: Please indicate that you are using the MAX9121/MAX9122/ MAX9123 when contacting these component suppliers. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 10F 10%, 10V tantalum Not installed, open resistor pads R41R48 0 capacitors (Case B) (0603) C1, C4, C9 3 AVX TAJB106K010R or Not installed, shorted resistor R49, R50 0 Kemet T494B106K010AS pads (0603) 1000pF 10%, 50V X7R ceramic JU1JU6, 12 3-pin headers C2, C11 2 chip capacitors (0402) JU15JU20 Murata GRM36X7R102K050A JU7JU14 8 4-pin headers 0.1F 10%, 16V X7R ceramic C3, C5C8, JU21JU28 8 2-pin headers 6 chip capacitors (0603) C10 Murata GRM39X7R104K016A DEN, DEN, Not installed, SMA edge-mount 0 REN, REN connectors 10pF 0.1pF, 50V ceramic chip C12C23 12 capacitors (0402) DIN1DIN 4, Murata GRM36COG100B050A RIN1- to RIN4-, SMA edge-mount connectors 12 RIN1+ to RIN4+ R1, R6, R23, Not installed, open resistor pads 0 R24 (0402) U1 1 MAX9123EUE (16-pin TSSOP) R2R5, R7R22 20 49.9 1% resistors (0402) U2 1 MAX9121EUE (16-pin TSSOP) R25R28 4 100 1% resistors (0402) None 8 Shunts (JU1, JU6, JU15JU20) R29R32 4 2.0k 1% resistors (0603) None 1 MAX9121 PC board R33R40 8 0 resistors (0603) None 1 MAX9121 EV kit data sheet None 1 MAX9121/MAX9122 data sheet Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX9121 Evaluation Kit Evaluating the Driver Quick Start (MAX9123) Circuit The MAX9121 EV kit is a fully assembled and tested sur- Follow the steps below to verify driver circuit operation. face-mount board. The EV kit contains an LVDS differen- Do not turn on the power supply until all connec- tial line driver located on the upper-half circuit, and tions are completed: receiver located on the lower-half circuit. 1) Verify that a shunt is across jumper JU1 (EN) pins 1 Recommended Equipment and 2. DC power supplies: 2) Connect a differential probe across pins 2 and 3 of One 3.3V 0.3V, 400mA or jumper JU7. Two 3.3V 0.3V, 200mA 3) Connect a 3.3V, 400mA power supply to the VCC1 supplies for operating the driver and receiver with pad. Connect the supply ground to the GND pad independent supplies (with R49 and R50 shorts cut closest to VCC1. open) 4) Connect a function generator that provides a Signal generator for LVDS signal input square wave to the input of the driver circuit SMA (e.g., HP 8131A) connector DIN1 with the following setting: Differential probe (e.g., Tektronix P6248) a) Frequency = 10MHz Digital sampling oscilloscope or logic analyzer b) V = 0.00V, V = 3.00V IL IH (e.g., Tektronix 11801C) c) Duty cycle = 50% 5) Turn on the power supply, enable the function gen- erator, and verify the differential output signal V OD = (OUT1+ - OUT1-). Table 1. Input Signals to Driver Circuit Note: For connections to verify every channel, see Using JU2 to JU5 Table 2. DRIVER INPUT Evaluating the Receiver JUMPER SHUNT LOCATION SIGNAL (MAX9121) Circuit Follow the steps below to verify receiver circuit operation. 1 and 2 connected to VCC IN1 = high JU2 Do not turn on the power supply until all connections 2 and 3 connected to GND IN1 = low are completed: 1 and 2 connected to VCC IN2 = high JU3 1) Verify that the shunt is across jumper JU15 (EN) 2 and 3 connected to GND IN2 = low pins 1 and 2. 1 and 2 connected to VCC IN3 = high JU4 2) Connect a scope probe across JU25 (OUT1) to 2 and 3 connected to GND IN3 = low observe the output signal. 1 and 2 connected to VCC IN4 = high 3) Connect a 3.3V, 400mA power supply to the VCC2 JU5 2 and 3 connected to GND IN4 = low pad. Connect the supply ground to the GND pad closest to VCC2. Table 2. Driver Probing Connections IC OUTPUT TESTING CHANNEL NAME PROBING HEADER (4 PIN), PIN NO. PROBING (OUT+ - OUT-) PIN NAME POINT OUT1- DOUT1- JU7, pins 2 (+) and 1 (-) Channel 1 JU7, pins 3 (+) and 2 (-) OUT1+ DOUT1+ JU7, pins 3 (+) and 4 (-) OUT2+ DOUT2+ JU8, pins 2 (+) and 1 (-) Channel 2 JU8, pins 2 (+) and 3 (-) OUT2- DOUT2- JU8, pins 3 (+) and 4 (-) OUT3- DOUT3- JU9, pins 2 (+) and 1 (-) Channel 3 JU9, pins 3 (+) and 2 (-) OUT3+ DOUT3+ JU9, pins 3 (+) and 4 (-) OUT4+ DOUT4+ JU10, pins 2 (+) and 1 (-) Channel 4 JU10, pins 2 (+) and 3 (-) OUT4- DOUT4- JU10, pins 3 (+) and 4 (-) 2 Evaluates: MAX9121/MAX9122/MAX9123