19-2302; Rev 0; 1/02 MAX9124 Evaluation Kit The MAX9124 EV kit can also be used to evaluate the MAX9126, which is the same as the MAX9125 but with integrated 115Ω (nominal) termination resistors. Additional pads on the board are provided for dynamically driving the enable and disable control signals with a pulse generator. Features ♦ Independent Quad Driver (MAX9124) and Quad Receiver (MAX9125/MAX9126) Circuits ♦ >500Mbps (250MHz) Switching Rate (MAX9125/MAX9126) >800Mbps (400MHz) Switching Rate (MAX9124) ♦ Supports Testing of Twisted-Pair Cables ♦ 50Ω Controlled-Impedance Signal Traces ♦ 16-Pin TSSOP Package ♦ Fully Assembled and Tested Ordering Information PART TEMP RANGE MAX9124EVKIT 0°C to +70°C IC PACKAGE 16 TSSOP Note: To evaluate the MAX9126, request a MAX9126EUE free sample with the MAX9124EVKIT. 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 5.1pF ±0.1pF, 50V ceramic chip capacitors (0402) Murata GRM36COG5R1B050A R1, R2, R3, R5–R10, R12–R16, R18–R21, R23, R24 20 49.9Ω ±1% resistors (0402) R4, R11, R17, R22 0 Not installed, open resistor pads (0402) R25–R28 4 100Ω ±1% resistors (0402) R29–R32 4 2.0kΩ ±1% resistors (0603) R33–R40 8 0Ω resistors (0603) 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–DIN4, RIN1- to RIN4-, RIN1+ to RIN4+ 12 SMA edge-mount connectors U1 1 MAX9124EUE (16-pin TSSOP) MAX9125EUE (16-pin TSSOP) U2 1 None 8 Shunts None 1 MAX9124 PC board None 1 MAX9124 EV kit data sheet None 1 MAX9124/MAX9125 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: MAX9124/MAX9125/MAX9126 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 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: MAX9124/MAX9125/MAX9126 MAX9124 Evaluation Kit Component Suppliers SUPPLIER PHONE FAX AVX 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 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) 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. Evaluating the Receiver (MAX9125) Circuit 2 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. 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 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. 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. _______________________________________________________________________________________ MAX9124 Evaluation Kit 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 twist- Table 1. Using JU1, JU3, JU4, and JU6 to Provide Input Signals to the Driver Circuit JUMPER SHUNT LOCATION JU1 JU3 JU6 JU4 1 and 2 IN PIN Connected to VCC DRIVER INPUT SIGNAL 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 IN3 = high 1 and 2 Connected to VCC 2 and 3 Connected to GND IN3 = low 1 and 2 Connected to VCC IN4 = high 2 and 3 Connected to GND IN4 = low ed-pair cable. When 49.9Ω 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 0Ω resistors R33–R40 to avoid signal reflection from the traces that connect 0Ω resistors to SMA connectors. 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. 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 Table 2. Driver Probing Connections CHANNEL NAME Channel 1 Channel 2 Channel 3 Channel 4 IC OUTPUT PIN NAME TESTING POINT 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+ JU10, pins 2 (+) and 1 (-) OUT3- DOUT3- JU10, pins 3 (+) and 4 (-) OUT4+ DOUT4+ JU9, pins 2 (+) and 1 (-) OUT4- DOUT4- JU9, pins 3 (+) and 4 (-) PROBING HEADER (4 PIN), PIN NO. PROBING (OUT+ - OUT-) JU7, pins 2 (+) and 3 (-) JU8, pins 3 (+) and 2 (-) JU10, pins 3 (+) and 2 (-) JU9, pins 2 (+) and 3 (-) _______________________________________________________________________________________ 3 Evaluates: MAX9124/MAX9125/MAX9126 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. Evaluates: MAX9124/MAX9125/MAX9126 MAX9124 Evaluation Kit Table 3. Receiver Probing Connections 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- JU14, pins 3 (+) and 4 (-) IN3+ IN3+ JU14, pins 2 (+) and 1 (-) IN4+ IN4+ JU13, pins 3 (+) and 4 (-) IN4- IN4- JU13, pins 2 (+) and 1 (-) be added on DEN, REN, DEN, and REN pads with 49.9Ω 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. 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 ENABLE/DISABLE LOGIC LEVEL High 2 and 3, connected to GND Low Open, no shunt Float Table 5. Enable and Disable Truth Table DEN (REN) DEN (REN) OPERATION FUNCTION Low High U1 (U2) disable All other combinations (including floating) U1 (U2) enable To evaluate the LVDS differential line driver (MAX9124) and receiver (MAX9125) together, remove 0Ω resistors R33–R40 at the input of the receiver circuit, and remove capacitors C12–C19 and 49.9Ω termination resistors R2, R3, R5, R6, R9, R10, R12, and R13 at the output of the driver. Use 100Ω 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 4 OUTPUT SIGNAL PROBING HEADER (2 PIN) OUT1 JU25 OUT2 JU26 OUT3 JU28 OUT4 JU27 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 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 (supplies), enable the function generator, and verify the output. Note: For connections to verify every channel, see Tables 2 and 3. Evaluating MAX9126 The MAX9124 EV kit can also evaluate the MAX9126, a differential line receiver with 115Ω internal termination _______________________________________________________________________________________ MAX9124 Evaluation Kit Evaluates: MAX9124/MAX9125/MAX9126 MAX9124 MAX9125 DOUT1+ IN1+ DIN1 DOUT1- IN1- DOUT2+ IN2+ 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 resistors. To evaluate the MAX9126, replace MAX9125EUE with a MAX9126EUE and remove the external 100Ω resistors R25 to R28. _______________________________________________________________________________________ 5 6 SMA SMA SMA 2 DIN2 2 DEN 2 DIN1 1 1 1 DOUT2- DOUT1- 1 2 3 1 2 3 R7 49.9Ω 1% 3 1 2 JU3 C6 0.1µF JU2 VCC1 JU8 3 C15 5.1pF 4 C14 5.1pF DOUT2- R4 OPEN 1 2 C5 0.1µF JU1 VCC1 JU7 3 C13 5.1pF 4 C12 5.1pF DOUT1+ R1 49.9Ω 1% 1 2 VCC1 VCM VCM JU22 R46 OPEN JU21 R45 OPEN R6 49.9Ω 1% R5 49.9Ω 1% R3 49.9Ω 1% R2 49.9Ω 1% 8 7 6 5 4 3 2 1 OUT1- GND IN2 OUT2+ OUT2- EN U1 IN4 VCC IN3 OUT3+ OUT3- EN OUT4- OUT4+ MAX9124 OUT1+ IN1 9 10 11 12 13 14 15 16 2 3 1 2 3 1 JU6 2 3 1 VCC1 JU5 VCC1 R10 49.9Ω 1% R9 49.9Ω 1% JU4 VCC1 R14 49.9Ω 1% R11 OPEN JU23 R47 OPEN R8 49.9Ω 1% 1 1 1 2 DIN3 2 DEN 1 SMA SMA 4 2 C7 0.1µF 3 SMA VCM 2 DIN4 JU9 R13 49.9Ω 1% R12 49.9Ω 1% C17 5.1pF C16 5.1pF DOUT4+ C2 1000pF JU24 R48 OPEN DOUT4- C3 0.1µF VCM C1 10µF 10V 4 2 C8 0.1µF 3 1 VCM GND VCM R50 SHORT R49 SHORT DOUT3- VCC1 C4 10µF 10V C18 5.1pF DOUT3+ C19 JU10 5.1pF GND VCC1 VCC2 Evaluates: MAX9124/MAX9125/MAX9126 MAX9124 Evaluation Kit Figure 2. MAX9124 EV Kit Schematic (Driver Circuit) _______________________________________________________________________________________ SMA SMA SMA SMA 1 2 RIN21 2 RIN2+ 1 2 REN 2 RIN1+ 1 2 RIN11 R19 49.9Ω 1% R18 49.9Ω 1% R17 OPEN R16 49.9Ω 1% R15 49.9Ω 1% 3 1 JU17 2 3 VCC2 2 JU16 1 VCC2 1 JU15 2 3 VCC2 IN2+ IN2- C21 5.1pF R30 2kΩ 1% C20 5.1pF R29 2kΩ 1% IN1+ IN1- R36 0Ω 3 4 1 2 3 4 1 2 JU26 JU25 JU12 R35 0Ω R34 0Ω JU11 R33 0Ω R26 100Ω 1% R42 OPEN R41 OPEN R25 100Ω 1% 8 7 6 5 4 3 2 GND IN2- IN2+ OUT2 EN U2 16 IN4+ 10 11 12 IN3- 9 IN3+ OUT3 EN 13 14 IN4- 15 VCC OUT4 MAX9125 OUT1+ IN1+ 1 IN1- R28 100Ω 3 1% 4 1 2 R27 100Ω 3 1% R39 0Ω R38 0Ω JU13 R37 0Ω R40 0Ω JU14 4 1 2 IN3- IN3+ IN4- IN4+ JU19 1 2 3 VCC2 R23 49.9Ω 1% R22 OPEN 1 2 REN R24 49.9Ω 1% RIN4+ SMA 2 RIN4SMA 2 SMA 1 RIN3+ 2 SMA 1 R21 49.9Ω 1% R20 49.9Ω 1% 1 C11 1000pF 1 2 RIN3SMA JU27 C10 0.1µF R43 OPEN C9 10µF 10V JU28 C22 5.1pF R31 2kΩ 1% R44 OPEN GND VCC2 C23 5.1pF R32 2kΩ 1% 3 2 JU18 1 VCC2 3 2 JU20 1 VCC2 MAX9124/MAX9125/MAX9126 SMA MAX9124 Evaluation Kit Figure 3. MAX9124 EV Kit Schematic (Receiver Circuit) _______________________________________________________________________________________ 7 Evaluates: MAX9124/MAX9125/MAX9126 MAX9124 Evaluation Kit 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 8 _______________________________________________________________________________________ MAX9124 Evaluation Kit 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 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX9124/MAX9125/MAX9126 1.0"