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| 19-2896; Rev 0; 6/03 MAX7438 Evaluation Kit General Description The MAX7438 evaluation kit (EV kit) is a fully assembled and tested surface mount board. The MAX7438 EV kit includes the MAX7438, a three-channel standard-definition video reconstruction filter with a back-porch clamp that sets the output blanking level of the video signal to ground. The MAX7438 has an internal gain of +2V/V, and the EV kit provides five levels of high-frequency boost. The EV kit operates from 5V dual supplies. The MAX7438 EV kit can also be used to evaluate the MAX7439, which is a three-channel, standard-definition video reconstruction filter with an internal gain of +3V/V. 5.0V Power Supplies o Selectable Input 75 Termination or DAC Termination o Selectable 75 Output Series Termination o Selectable High-Frequency Boost Levels o Surface-Mount Construction o Fully Assembled and Tested Features Evaluates: MAX7438/MAX7439 Component List DESIGNATION C1, C2 QTY 2 DESCRIPTION 1F 20%, 6.3V X5R ceramic capacitors (0603) Taiyo Yuden JMK107BJ105MA 0.1F 10%, 16V X7R ceramic capacitors (0603) Taiyo Yuden EMK107BJ104KA TDK C1608X7R1C104KT BNC PC board-mount jack connectors 2-pin headers 3-pin headers 10k 1% resistors (0603) 75k 1% resistors (0603) 5.11k 1% resistors (0603) 56.2k 1% resistors (0603) 82.5k 1% resistors (0603) 33.2k 1% resistors (0603) 61.9k 1% resistors (0603) 75 1% resistors (0603) 200 1% resistors (0603) 162 1% resistors (0603) Three-circuit terminal block MAX7438ETP (20-pin thin QFN 5mm x 5mm) Shunts MAX7438 PC board PART MAX7438EVKIT Ordering Information TEMP RANGE 0C to +70C IC PACKAGE 20 Thin QFN-EP* *EP = Exposed paddle. Note: To evaluate the MAX7439, please order a MAX7439ETP free sample with the MAX7438EVKIT. C3, C4 2 IN1, OUT1, IN2, OUT2, IN3, OUT3 JU1-JU22, JU24, JU26 JU23, JU25, JU27 R1, R5, R13, R21 R2, R10, R18 R3, R11, R19 R4, R9, R12, R17, R20, R25 R6, R14, R22 R7, R15, R23 R8, R16, R24 R26-R29, R31, R33 R30, R32, R34 R35, R36, R37 TB1 U1 None None Quick Start * 5.0V dual DC power supplies * Video signal generator (e.g., Tektronix TG 2000) 6 24 3 4 3 3 6 3 3 3 6 3 3 1 1 3 1 Recommended Equipment * Video measurement equipment (e.g., Tektronix VM 700A) The MAX7438 EV kit is a fully assembled and tested surface-mount board. Follow the steps below to verify board operation. Do not turn on the power supply until all connections are completed: Evaluating Channel 1 1) Verify that there are shunts across jumpers JU6, JU22, JU24, and JU26. 2) Verify that a shunt is installed across pins 1 and 2 on jumpers JU23, JU25, and JU27. 3) Verify that the rest of the jumpers are open. 4) Connect the output of the video signal generator to the IN1 BNC connector on the EV kit. 5) Connect the OUT1 BNC connector on the EV kit to the input of the video measurement equipment. ________________________________________________________________ Maxim Integrated Products 1 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. MAX7438 Evaluation Kit Evaluates: MAX7438/MAX7439 6) Connect both power-supply grounds to the threecircuit terminal block labeled GND. 7) Connect one +5.0V supply to the three-circuit terminal block labeled VCC. Connect the -5.0V supply to the three-terminal block labeled VSS. 8) Set the video signal generator for the desired video input signal, such as multiburst sweep. This signal must contain sync information (i.e., composite or Y). 9) Turn on all power supplies, and enable the signal generator. 10) Analyze the output signal with the VM700 video measurement equipment. output, the 200 termination resistor is provided on the board and is selected by changing jumpers JU23, JU25, and JU27 for channels 1, 2, and 3, respectively. A typical DAC termination resistor is 200. The external resistors R2-R25 form a voltage-divider between VCC and GND, and are used to program the level of high-frequency boost for each channel by setting different voltage levels at HFB_ pins. The MAX7438 EV kit incorporates jumpers to provide five different boost options for each individual channel. Refer to the HighFrequency Boost section in the MAX7438/MAX7439 data sheet. The resistor values used in the EV kit are for demonstration purposes only. Use the resistor values in Table 1 in the MAX7438/MAX7439 data sheet for actual designs. These lower value resistors have less coupling to noise. Table 2 lists the JU1-JU18 functions. Detailed Description Jumper Selection The MAX7438 EV kit provides options for evaluating with a video signal generator output or a current-output video DAC/encoder. Table 1 lists the jumper settings for selecting the input from either a video generator or a DAC. When interfacing to a video DAC or encoder Evaluating the MAX7439 The MAX7438 EV kit can be also used to evaluate the MAX7439. To evaluate the MAX7439, replace the MAX7438ETP with a MAX7439ETP. Table 1. Jumpers JU23, JU25, and JU27 Functions JU23 SHUNT LOCATION Pins 1 and 2 Pins 2 and 3 JU25 SHUNT LOCATION Pins 1 and 2 Pins 2 and 3 All other combinations JU27 SHUNT LOCATION Pins 1 and 2 Pins 2 and 3 INPUT TERMINATION 75 200 Undefined Note: To emulate a 200 DAC source resistor when driving from a 75 generator, remove jumpers JU22, JU24, and JU26. The 162 resistor added to a standard 75 termination equals approximately 200. Table 2. Jumpers JU1-JU18 Functions NOMINAL BOOST LEVEL (dB) MAX7438 0 0.5 1.0 1.5 2.0 Bypass MAX7439 0 0.75 1.50 2.25 3.00 Bypass CHANNEL 1 JU2 JU3 JU4 JU5 JU1 JU6 JUMPER IS CLOSED CHANNEL 2 JU8 JU9 JU10 JU11 JU7 JU12 CHANNEL 3 JU14 JU15 JU16 JU17 JU13 JU18 Note: Make sure only one shunt is installed at a time for each channel. Component Suppliers SUPPLER Taiyo Yuden TDK PHONE 800-348-2496 847-803-6100 FAX 847-925-0899 847-390-4405 WEBSITE www.t-yuden.com www.component.tdk.com Note: Please indicate that you are using the MAX7438/MAX7439 when contacting these suppliers. 2 _______________________________________________________________________________________ VCC VCC JU1 TB1 VCC C1 1F 6.3V VSS R1 10k R23 33.2k R21 10k R19 5.11k C3 0.1F JU18 JU16 6 11 GRD HFB3 R37 162 JU26 13 JU27 14 VSS RTRIM N.C. N.C. N.C. N.C. 9 20 1 10 15 VCC 3 HFB1 R35 162 2 IN1 IN3 19 JU15 JU14 C4 0.1F JU17 R25 56.2k C2 1F 6.3V R24 61.9k R22 82.5k R20 56.2k R18 75k R4 56.2k R2 75k HFB1 HFB3 JU13 TERMINAL BLOCK TB1-1 TB1-2 TB1-3 GND VSS VCC R8 61.9k R6 82.5k R9 56.2k JU6 JU3 Figure 1. MAX7438 EV Kit Schematic R5 10k JU2 R3 5.11k R7 33.2k JU5 JU4 IN1 JU23 JU22 123 R30 200 4 N.C. N.C. R26 75 5 OUT1 HFB2 17 JU7 JU24 JU20 R32 200 3 2 1 R14 82.5k R12 56.2k JU8 R15 33.2k R13 10k R10 75k R36 162 18 7 8 IN2 N.C. OUT2 R27 75 OUT3 JU19 1 U1 16 1 2 123 R33 75 R34 200 IN3 2 MAX7438 R29 75 OUT1 2 1 12 R28 75 JU21 1 2 OUT3 VCC 1 2 OUT2 R16 61.9k R17 56.2k R11 5.11k JU12 JU25 NOTE: 1. ALL RESISTORS ARE 1% 2. U1 EXPOSED PADDLE IS CONNECTED TO VSS JU11 JU10 JU9 1 IN2 2 Evaluates: MAX7438/MAX7439 _______________________________________________________________________________________ R31 75 HFB2 MAX7438 Evaluation Kit 3 MAX7438 Evaluation Kit Evaluates: MAX7438/MAX7439 Figure 2. MAX7438 EV Kit Component Placement Guide--Top Silkscreen 4 _______________________________________________________________________________________ MAX7438 Evaluation Kit Evaluates: MAX7438/MAX7439 Figure 3. MAX7438 EV Kit PC Board Layout--Component Side _______________________________________________________________________________________ 5 MAX7438 Evaluation Kit Evaluates: MAX7438/MAX7439 Figure 4. MAX7438 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. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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