MAX4029EVKIT

19-3401; Rev 1; 8/06 MAX4029 Evaluation Kit The MAX4029 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB that contains the MAX4029, which is a four-channel, 2:1, voltage-feedback multiplexer-amplifier with input clamps and a fixed gain of +2V/V (6dB). Channel 1 inputs are clamped to the video sync tip of their input signals, while the remaining inputs can be clamped to either the video sync tip of their respective input signals or the keyclamp voltage. The latter is referred to as key clamp. The EV kit operates from a single +5V power supply. Features ♦ Single +5V Operation ♦ Composite, S-Video, Component, or RGB Primaries ♦ Independently Selectable Sync-Tip or Key-Clamp Inputs ♦ Adjustable Key-Clamp Voltage ♦ Standard 75Ω Input/Output Termination ♦ Surface-Mount Components ♦ Fully Assembled and Tested Ordering Information Component List DESIGNATION QTY C1 1 C2, C4–C11* 9 C3 1 R1–R12 12 R13 R14 INPUT1A, INPUT1B, INPUT2A, INPUT2B, INPUT3A, INPUT3B, INPUT4A, INPUT4B, OUTPUT1–OUTPUT4 JU1–JU5 None None U1 1 1 DESCRIPTION 0.01µF ±10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H103K 0.1µF ±10%, 25V X7R ceramic capacitors (0603) TDK C1608X7R1E104K 4.7µF ±10%, 6.3V X5R ceramic capacitor (0603) Murata GRM188R60J475K 75.0Ω ±1% resistors (1206) Panasonic ERJ-8ENF75R0V 2.2kΩ ±5% resistor (0603) 10kΩ potentiometer 19 turn, 3/8in 12 75Ω BNC PC board-mount jack connectors 5 5 1 1 3-pin headers Shunts MAX4029 PC board MAX4029EUP (20-pin TSSOP) *6.8µF recommended for 720p and 1080i applications. Use Vishay/Sprague part number 293D685X9016B2M, case size “B” ±10%. PART MAX4029EVKIT TEMP RANGE 0°C to +70°C IC PACKAGE 20 TSSOP Quick Start Recommended Equipment • +5VDC power supply • Color camera (e.g., Hitachi KPC551) or DVD player • Oscilloscope Procedure The MAX4029 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 pins 1 and 2 of jumper JU1 (EV kit on). 2) Verify that a shunt is installed across pins 1 and 2 of jumper JU2 (channel A selected). 3) Verify that a shunt is installed across pins 2 and 3 of jumper JU3 (input 2A is key clamped). 4) Connect the color camera’s Y/C OUT to the EV kit as follows: • The yellow cable (LUMA) to the INPUT1A BNC connector on the EV kit. • The white cable (CHROMA) to the INPUT2A BNC connector on the EV kit. 5) Set the lens switch of the color camera to video mode and connect the power cord to an appropriate AC power source. ________________________________________________________________ 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: MAX4029 General Description Evaluates: MAX4029 MAX4029 Evaluation Kit Component Suppliers SUPPLIER PHONE FAX Murata 770-436-1300 770-436-3030 Panasonic 714-373-7366 714-737-7323 TDK 847-803-6100 847-390-4405 Note: Indicate that you are using the MAX4029 when contacting these component suppliers. 6) Connect the positive terminal of the DC power supply to the VCC pad on the EV kit. Connect the ground terminal of the DC power supply to the GND pad. 7) Turn on the DC power supply, and turn on the color camera’s power switch. 8) Verify that OUTPUT1 of the EV kit has a luma signal with a sync tip using the oscilloscope. 9) Verify that OUTPUT2 of the EV kit has a chroma signal with a color burst using the oscilloscope. Detailed Description The MAX4029 EV kit is a fully assembled and tested surface-mount PCB that contains the MAX4029, which is a four-channel, 2:1, voltage-feedback multiplexeramplifier with input clamps and a fixed gain of +2V/V (6dB). Channel 1 inputs (1A and 1B) are clamped to the video sync tip of their respective input signals. The remaining inputs can be clamped to either the video sync tip of their respective input signals (INPUT_A or INPUT_B) or the key-clamp voltage as described below. The latter clamp method is referred to as a key clamp. The key-clamp voltage is adjustable between 0.9V to 1.6V by varying R KEYREF from 12.2kΩ to 2.2kΩ, respectively. RKEYREF is the total resistance (R13 and R14) from pin 6 to GND. All the video input and output channels on the MAX4029 EV kit are terminated at 75Ω impedance. All the video input channels are AC-coupled. AC-coupling the video input signal allows the EV kit to operate from a single +5V power supply without compromising the video quality. 2 WEBSITE www.murata.com www.panasonic.com www.component.tdk.com Applications Information Sync Tip and Key Clamps The MAX4029 has AC-coupled inputs, with either a sync tip or key clamps, to provide bias for the video signal. Channel 1 of the MAX4029 always has a synctip clamp at the input, while the remaining channels are selectable as either sync tip or key clamps to accommodate the various video waveforms (see the Clamp/Key-Clamp Settings for Video Formats section). The value of the sync-tip clamp voltage is set internally for the lowest value consistent with linear operation and cannot be adjusted. The key-clamp voltage is adjustable to compensate for variations in the voltage between component video inputs such as linear RGB, YPbPr, and Y-C, by varying RKEYREF. The key-clamp voltage can be calculated from Figure 1 or the following equation: VKey-Clamp = 0.40 + 2000 / [(5000 x RKEYREF) / (5000 + RKEYREF)] In order for these clamps (sync tip or key) to work properly, the input must be coupled with a 0.1µF capacitor (typ) having low leakage (2µA max). Without proper coupling, the clamp voltage will change during the Horizontal line time causing the black level to vary, changing the image brightness from left to right on the display. In addition to the capacitor, a low resistance (