19-2319; Rev 0; 1/02 MAX9121 Evaluation Kit Features ♦ Independent Driver (MAX9123) and Quad Receiver (MAX9121/MAX9122) Circuits ♦ >500Mbps (250MHz) Switching Rate (MAX9121/MAX9122) ♦ >800Mbps (400MHz) Switching Rate (MAX9123) ♦ Supports Testing of Twisted-Pair Cables ♦ 50Ω Controlled-Impedance Traces ♦ 16-Pin TSSOP Package ♦ Fully Assembled and Tested The MAX9121 EV kit can also be used to evaluate the MAX9122, which is the same as the MAX9121 but with integrated 107Ω (nominal) termination resistors. Additional pads on the board are provided for dynamically driving the enable and disable control signals with a pulse generator. Ordering Information PART TEMP RANGE MAX9121EVKIT 0°C to +70°C IC PACKAGE 16 TSSOP Note: To evaluate the MAX9122, request a MAX9122EUE free sample with the MAX9121EVKIT. Component Suppliers PHONE FAX AVX SUPPLIER 803-943-0690 803-626-3123 Kemet 408-986-0424 408-986-1442 Murata 814-237-1431 814-238-0490 Note: Please indicate that you are using the MAX9121/MAX9122/ MAX9123 when contacting these component suppliers. Component List DESIGNATION C1, C4, C9 C2, C11 C3, C5–C8, C10 C12–C23 QTY 3 2 6 12 DESCRIPTION 10µF ±10%, 10V tantalum capacitors (Case B) AVX TAJB106K010R or Kemet T494B106K010AS 1000pF ±10%, 50V X7R ceramic chip capacitors (0402) Murata GRM36X7R102K050A 0.1µF ±10%, 16V X7R ceramic chip capacitors (0603) Murata GRM39X7R104K016A 10pF ±0.1pF, 50V ceramic chip capacitors (0402) Murata GRM36COG100B050A DESIGNATION QTY DESCRIPTION R41–R48 0 Not installed, open resistor pads (0603) R49, R50 0 Not installed, shorted resistor pads (0603) JU1–JU6, JU15–JU20 12 3-pin headers JU7–JU14 8 4-pin headers JU21–JU28 8 2-pin headers DEN, DEN, REN, REN 0 Not installed, SMA edge-mount connectors DIN1–DIN 4, RIN1- to RIN4-, RIN1+ to RIN4+ 12 SMA edge-mount connectors R1, R6, R23, R24 0 Not installed, open resistor pads (0402) U1 1 MAX9123EUE (16-pin TSSOP) R2–R5, R7–R22 20 49.9Ω ±1% resistors (0402) U2 1 MAX9121EUE (16-pin TSSOP) R25–R28 4 100Ω ±1% resistors (0402) None 8 Shunts (JU1, JU6, JU15–JU20) R29–R32 4 2.0kΩ ±1% resistors (0603) None 1 MAX9121 PC board R33–R40 8 0Ω resistors (0603) None 1 MAX9121 EV kit data sheet None 1 MAX9121/MAX9122 data sheet ________________________________________________________________ Maxim Integrated Products 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. 1 Evaluates: MAX9121/MAX9122/MAX9123 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 50Ω 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. Evaluates: MAX9121/MAX9122/MAX9123 MAX9121 Evaluation Kit Evaluating the Driver (MAX9123) Circuit 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. Follow the steps below to verify driver circuit operation. Do not turn on the power supply until all connections are completed: Recommended Equipment 1) Verify that a shunt is across jumper JU1 (EN) pins 1 and 2. • 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) JU2 5) Turn on the power supply, enable the function generator, and verify the differential output signal VOD = (OUT1+ - OUT1-). JU3 JU4 JU5 Note: For connections to verify every channel, see Table 2. SHUNT LOCATION DRIVER INPUT SIGNAL 1 and 2 connected to VCC IN1 = high 2 and 3 connected to GND IN1 = low 1 and 2 connected to VCC IN2 = high 2 and 3 connected to GND IN2 = low 1 and 2 connected to VCC IN3 = high 2 and 3 connected to GND IN3 = low 1 and 2 connected to VCC IN4 = high 2 and 3 connected to GND IN4 = low 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% Table 1. Input Signals to Driver Circuit Using JU2 to JU5 JUMPER 2) Connect a differential probe across pins 2 and 3 of jumper JU7. 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 2 IC OUTPUT PIN NAME TESTING POINT PROBING HEADER (4 PIN), PIN NO. OUT1- DOUT1- JU7, pins 2 (+) and 1 (-) OUT1+ DOUT1+ JU7, pins 3 (+) and 4 (-) OUT2+ DOUT2+ JU8, pins 2 (+) and 1 (-) OUT2- DOUT2- JU8, pins 3 (+) and 4 (-) OUT3- DOUT3- JU9, pins 2 (+) and 1 (-) OUT3+ DOUT3+ JU9, pins 3 (+) and 4 (-) OUT4+ DOUT4+ JU10, pins 2 (+) and 1 (-) OUT4- DOUT4- 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 (-) _______________________________________________________________________________________ MAX9121 Evaluation Kit CHANNEL NAME Channel 1 Channel 2 Channel 3 Channel 4 IC OUTPUT PIN NAME TESTING POINT PROBING HEADER (4 PIN), PIN NO. IN1- IN1- JU11, pins 2 (+) and 1 (-) IN1+ IN1+ JU11, pins 3 (+) and 4 (-) IN2+ IN2+ JU12, pins 2 (+) and 1 (-) IN2- IN2- JU12, pins 3 (+) and 4 (-) IN3- IN3- JU13, pins 2 (+) and 1 (-) IN3+ IN3+ JU13, pins 3 (+) and 4 (-) IN4+ IN4+ JU14, pins 2 (+) and 1 (-) IN4- IN4- JU14, pins 3 (+) and 4 (-) 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. 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 50Ω controlledimpedance traces for all input signal traces with 49.9Ω 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. OUTPUT SIGNAL PROBING HEADER (2 PIN) OUT1 JU25 OUT2 JU26 OUT3 JU27 OUT4 JU28 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 0Ω resistors R33–R40 to avoid signal reflection from the traces that connect 0Ω resistors to SMA connectors. Using Separate Power Supplies Output Signals 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 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. _______________________________________________________________________________________ 3 Evaluates: MAX9121/MAX9122/MAX9123 Table 3. Receiver Probing Connections Evaluates: MAX9121/MAX9122/MAX9123 MAX9121 Evaluation Kit 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. 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 49.9Ω 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 0Ω resistors R33–R40 at the input of the receiver circuit, and remove capacitors C16–C23 and 49.9Ω termination resistors R7–R14 at the output of the driver. Use 100Ω 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. Table 4. JU1, JU6, JU15, and JU20 Setting and Enable/Disable Logic Level JUMPER JU1, JU6, JU15, JU20 4 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 100Ω 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. Evaluating the MAX9122 The MAX9121 EV kit can also evaluate the MAX9122, a differential line receiver with 107Ω internal termination resistors. To evaluate the MAX9122, replace MAX9121EUE with a MAX9122EUE and remove the external 100Ω resistors R25–R28. Table 5. Enable and Disable Truth Table OPERATION FUNCTION ENABLE/DISABLE LOGIC LEVEL DEN (REN) 1 and 2, connected to VCC High High Low U1 (U2) enable 2 and 3, connected to GND Low High Float U1 (U2) enable Open, no shunt Float SHUNT LOCATION DEN (REN) All other combinations _______________________________________________________________________________________ U1 (U2) disable MAX9121 Evaluation Kit Evaluates: MAX9121/MAX9122/MAX9123 MAX9123 MAX9121 DOUT1+ IN1+ DOUT1- IN1- DOUT2+ IN2+ DIN1 DIN2 DOUT2- IN2- DOUT3+ IN3+ DIN3 DOUT3- IN3- DOUT4+ IN4+ DIN4 DOUT4- DRIVER CIRCUIT (UPPER-HALF CIRCUIT) 100Ω OUT1 100Ω OUT2 100Ω OUT3 100Ω OUT4 IN4- RECEIVER CIRCUIT (LOWER-HALF CIRCUIT) Figure 1. Twisted-Pair Cable Interconnect Diagram _______________________________________________________________________________________ 5 Evaluates: MAX9121/MAX9122/MAX9123 MAX9121 Evaluation Kit VCC1 DOUT1DEN SMA 1 JU1 2 3 1 2 1 EN OUT1- 16 R7 49.9Ω 1% R1 OPEN VCC1 DIN1 SMA 1 JU2 2 3 1 2 R8 49.9Ω 1% 2 IN1 OUT1+ R2 49.9Ω 1% 1 JU3 2 3 1 2 OUT2+ 3 IN2 R3 49.9Ω 1% U1 R10 49.9Ω 1% C2 1000pF R46 OPEN VCM C6 0.1µF JU22 1 2 3 4 C3 0.1µF 5 GND 1 JU4 2 3 JU8 R11 49.9Ω 1% R12 49.9Ω 1% OUT3+ 1 JU5 2 3 1 DOUT2R50 SHORT R47 OPEN VCM C7 0.1µF JU23 1 2 3 4 C20 10pF JU9 DOUT3+ OUT4+ 10 R13 49.9Ω 1% R5 49.9Ω 1% 1 JU6 2 3 1 2 C21 10pF DOUT4+ 7 IN4 R14 49.9Ω 1% 8 EN OUT4- R48 OPEN JU24 VCM C8 0.1µF 1 2 3 4 C22 10pF JU10 C23 10pF DOUT4- 9 R6 OPEN Figure 2. MAX9121 EV Kit Schematic (Driver Circuit) 6 GND VCC1 R49 VCC2 SHORT 11 VCC1 DEN SMA C19 10pF DOUT3OUT3- VCM C4 10µF 10V 12 6 IN3 R4 49.9Ω 1% 2 VCM C18 10pF VCC1 DIN4 SMA C17 10pF DOUT1+ 4 V CC 1 2 JU7 13 VCC1 DIN3 SMA C16 10pF 14 R9 49.9Ω 1% OUT2C1 10µF 10V C5 0.1µF JU21 1 2 3 4 15 MAX9123 VCC1 GND VCM DOUT2+ VCC1 DIN2 SMA R45 OPEN _______________________________________________________________________________________ MAX9121 Evaluation Kit VCC2 1 2 R15 49.9Ω 1% IN1- IN1+ RIN1+ SMA RIN2+ SMA RIN3SMA RIN4+ SMA JU11 EN 16 R25 100Ω 1% 2 R34 0Ω 1 JU15 2 3 1 R23 OPEN 2 REN SMA R29 2kΩ 1% R17 49.9Ω 1% R30 2kΩ 1% IN2+ R35 0Ω 3 1 2 3 4 JU12 R26 100Ω 1% OUT2 IN2VCC R18 49.9Ω 1% U2 1 2 IN3- R37 0Ω 5 1 2 3 4 JU13 GND 12 C9 10µF 10V C10 0.1µF VCC2 1 JU18 2 3 6 IN3+ OUT3 11 JU27 R32 2kΩ 1% C14 10pF R20 49.9Ω 1% 2 VCC2 1 JU19 2 3 R44 OPEN OUT4 R21 49.9Ω 1% GND R43 OPEN 1 10 JU28 IN4+ R39 0Ω 7 1 2 3 4 JU14 R40 0Ω 1 2 C11 1000pF IN3- 1 2 C13 10pF VCC2 R31 2kΩ 1% R27 100Ω 1% R38 0Ω C12 10pF 1 JU17 2 3 13 MAX9121 R19 49.9Ω 1% JU25 14 JU26 4 R36 0Ω VCC2 R42 OPEN IN2+ 1 2 1 JU16 2 3 15 1 2 VCC2 IN1+ OUT1 IN4RIN4SMA 1 2 3 4 IN1- R41 OPEN IN3+ RIN3+ SMA 1 R16 49.9Ω 1% IN2RIN2SMA R33 0Ω 1 2 Evaluates: MAX9121/MAX9122/MAX9123 RIN1SMA C15 10pF IN4+ VCC2 R28 100Ω 1% 8 IN4- EN 9 1 JU20 2 3 1 R24 OPEN 2 REN SMA R22 49.9Ω 1% Figure 3. MAX9121 EV Kit Schematic (Receiver Circuit) _______________________________________________________________________________________ 7 Evaluates: MAX9121/MAX9122/MAX9123 MAX9121 Evaluation Kit 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 8 _______________________________________________________________________________________ MAX9121 Evaluation Kit 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 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. Evaluates: MAX9121/MAX9122/MAX9123 1.0"