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19-3374A; Rev 0; 7/04
MAX7450 Evaluation Kit
General Description
The MAX7450 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains a MAX7450. The MAX7450 is a low-cost, high-performance, complete front-end video-signal conditioner with automatic gain control (AGC) and a back-porch clamp to GND. The device includes an out-of-band noise filter, blank-level clamp, loss-of-sync (LOS) detector, 6dB of AGC, and an output buffer capable of driving either a 150 video load or a high-impedance load. These features optimize the video-signal quality for further video processing through a crosspoint device or video decoder. The MAX7450 EV kit can also evaluate the MAX7451. The EV kit operates from a dual 5V power supply for the MAX7450 or 3V power supply for the MAX7451. Dual-Supply Operation MAX7450 (5V) MAX7451 (3V) Output Buffer Drives Standard Video Load or High-Impedance Load with 0dB or +6dB Gain Input Fault Detection with LOS Output AGC (6dB Range) Standard 75 Input/Output Termination Evaluates the MAX7451 (3V VCC) Surface-Mount Components Fully Assembled and Tested
Features
Evaluates: MAX7450/MAX7451
Component List
DESIGNATION QTY C1, C4 2 DESCRIPTION 1F 10%, 10V X5R ceramic capacitors (0603) TDK C1608X5R1A105K 0.1F 10%, 25V X7R ceramic capacitors (0603) TDK C1608X7R1E104K 75.0 1% resistors (0805) MAX7450ESA (8-pin SO with exposed paddle) 75 BNC PC-board mount jack connectors 2-pin headers 3-pin headers Shunts MAX7450 PC board PART MAX7450EVKIT
Ordering Information
TEMP RANGE 0C to +70C IC PACKAGE 8 SO-EP*
*EP = Exposed paddle.
C2, C3, C5 R1, R2 U1 IN, OUT JU1, JU2 JU3, JU4 None None
3 2 1 2 2 2 4 1
Quick Start
Recommended Equipment
* 5V dual DC power supply * Video-signal generator (e.g., Tektronix TG-2000) * Video measurement equipment (e.g., Tektronix VM700A)
Procedure
The MAX7450 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed: 1) Verify that a shunt is installed across jumper JU1 (75 input termination).
Component Supplier
SUPPLIER TDK PHONE 847-803-6100 FAX 847-390-4405 WEBSITE www.component.tdk.com
Note: Indicate that you are using the MAX7450 EV kit when contacting this supplier.
________________________________________________________________ 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.
MAX7450 Evaluation Kit Evaluates: MAX7450/MAX7451
2) Verify that a shunt is not installed across jumper JU2 (75 output termination). 3) Verify that a shunt is installed across pins 1 and 2 of jumper JU3 (gain = 2). 4) Verify that a shunt is installed across pins 2 and 3 of jumper JU4 (AGC enabled). 5) Connect the output of the video-signal generator to the IN BNC connector on the MAX7450 EV kit. 6) Connect the OUT BNC connector on the EV kit to the input of the video measurement equipment. 7) Connect both power-supply grounds to the GND pad. 8) Connect the +5V supply to the VCC pad on the EV kit. Connect the -5V supply to the VSS pad on the EV kit. 9) Set the video signal generator for the desired video input signal, such as multiburst sweep. This signal must contain sync information (i.e., CVBS or Y). 10) Turn on the power supply and enable the video signal generator. 11) Analyze the video output signal with the VM-700A video measurement equipment. at 75 with jumpers. The MAX7450 EV kit operates from a dual 5V power supply. The MAX7450 EV kit can also evaluate the MAX7451 after replacing IC U1. See the Evaluating the MAX7451 section for further details.
Jumper Selection
Input Termination
The MAX7450 EV kit features an option to terminate the video input channel to 75 or open. Jumper JU1 selects the input termination on the MAX7450 EV kit. Table 1 lists the selectable jumper options.
Table 1. JU1 Jumper Selection
SHUNT POSITION Installed Not installed VIDEO INPUT SIGNAL TERMINATION 75 High impedance
Output Termination
The MAX7450 EV kit features an option to terminate the video output channel to 75 or 0. Jumper JU2 selects the output termination on the MAX7450 EV kit. Table 2 lists the selectable jumper options.
Detailed Description
The MAX7450 EV kit is a fully assembled and tested surface-mount circuit board that contains a MAX7450, which provides complete front-end video-signal conditioning. The MAX7450 is designed to improve the quality of standard-definition video signals. The MAX7450 also provides out-of-band noise filtering, LOS detection, back-porch clamping to ground, AGC that normalizes the sync amplitude to a standard video level, and an output buffer with selectable gains (0dB or +6dB). The MAX7450 EV kit features an option to disable the AGC by setting the logic level at the AGCD pin of the MAX7450. When the AGC is enabled (AGCD = logic low), the video input signal is set to 1VP-P and then fed into the output buffer. When the AGC is disabled (AGCD = logic high), the video signal is fed straight into the output buffer. The output buffer amplifies the video signal with a gain of 1V/V or 2V/V according to the logic level at the GSET pin of the MAX7450. An LOS test point is also provided on the EV kit. The LOS output is logic high when the sync signal is not present on the input for approximately 15 horizontal lines. The video input channel on the MAX7450 EV kit is ACcoupled, while the video output channel is DC-coupled. Both the input and output channels can be terminated
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Table 2. JU2 Jumper Selection
SHUNT POSITION Installed Not installed BACK-MATCH RESISTOR VALUE () 0 75
Gain Selection
The MAX7450 EV kit features an option to select the video gain. Jumper JU4 (GSET) controls the AGC enable and disable, while JU3 (AGCD) sets the output buffer gain for the MAX7450 EV kit. Table 3 lists the selectable jumper options.
Table 3. JU3 and JU4 Gain-Control Settings
SHUNT POSITION JU3 (GSET) 2-3 (low) 1-2 (high) 2-3 (low) 1-2 (high) JU4 (AGCD) 2-3 (low) 2-3 (low) 1-2 (high) 1-2 (high) VOUT 1VP-P fixed 2VP-P fixed VOUT = VIN VOUT = 2VIN
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MAX7450 Evaluation Kit
Evaluating the MAX7451
The MAX7450 EV kit can also evaluate the MAX7451. To evaluate the MAX7451, replace U1 with a MAX7451 and power the EV kit with a 3V power supply.
Evaluates: MAX7450/MAX7451
VCC VCC C1 1F GND C3 0.1F IN JU1 R1 75 1% 1 C2 0.1F VCC U1 LOS 8 LOS
MAX7450
2 IN GSET 7
VCC JU3 2 1 3 R2 75 1% GSET
3
GND
OUT
6
OUT
VCC VSS C4 1F JU4 2 1 3
JU2 AGCD
4 C5 0.1F
VSS
AGCD
5
Figure 1. MAX7450 EV Kit Schematic
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MAX7450 Evaluation Kit Evaluates: MAX7450/MAX7451
Figure 2. MAX7450 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX7450 EV Kit PC Board Layout--Component Side
Figure 4. MAX7450 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.
4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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