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19-3401; Rev 0; 8/04
MAX4029 Evaluation Kit
General Description
The MAX4029 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board 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 key clamp voltage. The latter is referred to as key clamp. The EV kit operates from a single +5V power supply. Single +5V Operation Composite, S-Video, Component, or RGB Primaries Independently Selectable Sync-Tip or Key-Clamp Inputs Adjustable Key-Clamp Voltage Standard 75 Input/Output Termination Surface-Mount Components Fully Assembled and Tested
Features
Evaluates: MAX4029
Component List
DESIGNATION C1 QTY 1 DESCRIPTION 0.01F 10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H103K 0.1F 10%, 25V X7R ceramic capacitors (0603) TDK C1608X7R1E104K 4.7F 10%, 6.3V X5R ceramic capacitor (0603) Murata GRM188R60J475K 75.0 1% resistors (1206) Panasonic ERJ-8ENF75R0V 2.2k 5% resistor (0603) 10k potentiometer 19 turn, 3/8in 75 BNC PC board-mount jack connectors 3-pin headers Shunts MAX4029 PC board MAX4029EUP (20-pin TSSOP) PART MAX4029EVKIT
Ordering Information
TEMP RANGE 0C to 70C IC PACKAGE 20 TSSOP
C2, C4-C11
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Quick Start
Recommended Equipment
* * * +5VDC power supply Color camera (e.g., Hitachi KPC551) or DVD player Oscilloscope
C3 R1-R12 R13 R14 INPUT1A, INPUT1B, INPUT2A, INPUT2B, INPUT3A, INPUT3B, INPUT4A, INPUT4B, OUTPUT1-OUTPUT4 JU1-JU5 None None U1
1 12 1 1
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.
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5 5 1 1
________________________________________________________________ Maxim Integrated Products
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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.
MAX4029 Evaluation Kit Evaluates: MAX4029
Component Suppliers
SUPPLIER Murata Panasonic TDK PHONE 770-436-1300 714-373-7366 847-803-6100 FAX 770-436-3030 714-737-7323 847-390-4405 WEBSITE www.murata.com www.panasonic.com www.component.tdk.com
Note: Indicate that you are using the MAX4029 EV kit when contacting these 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.
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 0.1F capacitor (typ) having low leakage (2A 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 (<75) is required on the source side to return the capacitor to ground. The clamps used here are active devices with the coupling capacitor serving two functions: first, as a charge reservoir to maintain the clamp voltage, and second, as the compensation capacitor for the clamp itself. If an input is not used, it must be terminated to avoid causing oscillations that could couple to another input.
Detailed Description
The MAX4029 EV kit is a fully assembled and tested surface-mount circuit board 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 (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 12.2k to 2.2k, 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 75 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.
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MAX4029 Evaluation Kit
In general, a sync tip clamp is used for composite video (Cvbs), gamma-corrected primaries (R'G'B'), and the luma signal (Y') in S-Video. A key clamp is preferred for component color difference signals (Pb & Pr), linear primaries (RGB in PCs), and chroma (C) in SVideo. The rule is to sync-tip clamp a signal if sync is present and key clamp all others. Several examples are given in the Clamp/Key-Clamp Settings for Video Formats section.
Evaluates: MAX4029
KEY-CLAMP REFERENCE VOLTAGE vs. RKEYREF
1.8 KEY-CLAMP REFERENCE VOLTAGE (V) 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 1 3 5 7 RKEYREF (k) 9 11 13
Clamp/Key-Clamp Settings for Video Formats
Table 1 provides the clamp settings for the MAX4029 to interface with various video formats.
Figure 1. Key-Clamp Voltage vs. RKEYREF
Table 1. MAX4029 Clamp Settings for Video Formats
INPUT 1 2 3 4 FORMAT Cvbs1 Cvbs2 Cvbs3 Cvbs4 CLAMP/KEY Clamp Clamp Clamp Clamp INPUT 1 2 3 4 FORMAT Gs R B Cvbs CLAMP/KEY Clamp Key Key Clamp
Gs, B, R has sync only on green.
INPUT 1 2 3 4 FORMAT H-Sync G B R CLAMP/KEY Clamp Key Key Key INPUT 1 2 3 4 FORMAT Y Pr Pb Cvbs CLAMP/KEY Clamp Key Key Clamp
R, G, B has sync on none.
INPUT 1 2 3 4 FORMAT Y C Cvbs Cvbs CLAMP/KEY Clamp Key Clamp Clamp
INPUT 1 2 3 4
FORMAT Cvbs G' B' R'
CLAMP/KEY Clamp Clamp Clamp Clamp
R', G', B' has sync on all.
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MAX4029 Evaluation Kit Evaluates: MAX4029
Jumper Selection
Disable Mode (DISABLE) The MAX4029 EV kit features an option to disable all the video outputs on the EV kit. Jumper JU1 selects the disable mode for the MAX4029. Table 2 lists the selectable jumper options. Clamp/Key Clamp Selection for Channel 3 (CLAMP/KEY_3) The MAX4029 EV kit features an option to select between clamp or key clamp for channel 3. Jumper JU4 selects between clamp/key-clamp settings. Table 5 lists the selectable jumper options.
Table 2. JU1 Jumper Selection
SHUNT POSITION 1-2 2-3 DISABLE PIN High Low Connected to external logic EV KIT FUNCTION Enabled Disabled DISABLE driven by external logic; disable is active low
Table 5. JU4 Jumper Selection
SHUNT POSITION 1-2 2-3 None CLAMP/KEY_3 High Low Connected to external logic CHANNEL 3 CLAMP FUNCTION Clamp Key clamp CLAMP/KEY_3 driven by external logic
None
Channel Select Input (A/B) The MAX4029 EV kit features an option to select between channels A or B inputs. Jumper JU2 selects the desired input channels for the MAX4029. Table 3 lists the selectable jumper options.
Table 3. JU2 Jumper Selection
SHUNT POSITION 1-2 2-3 None A/B PIN High Low Connected to external logic CHANNEL SELECTED A B A/B driven by external logic
Clamp/Key Clamp Selection for Channel 4 (CLAMP/KEY_4) The MAX4029 EV kit features an option to select between clamp or key clamp for channel 4. Jumper JU5 selects between clamp/key-clamp settings. Table 6 lists the selectable jumper options.
Table 6. JU5 Jumper Selection
SHUNT POSITION 1-2 2-3 CLAMP/KEY_4 High Low Connected to external logic CHANNEL 4 CLAMP FUNCTION Clamp Key clamp CLAMP/KEY_4 driven by external logic
Clamp/Key Clamp Selection for Channel 2 (CLAMP/KEY_2) The MAX4029 EV kit features an option to select between clamp or key clamp for channel 2. Jumper JU3 selects between clamp/key-clamp settings. Table 4 lists the selectable jumper options.
None
Table 4. JU3 Jumper Selection
SHUNT POSITION 1-2 2-3 None CLAMP/KEY_2 High Low Connected to external logic CHANNEL 2 CLAMP FUNCTION Clamp Key clamp CLAMP/KEY_2 driven by external logic
4
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MAX4029 Evaluation Kit Evaluates: MAX4029
VCC INPUT1A C4 0.1F VCC IN1A GND C5 0.1F 13 17 C1 0.01F C2 0.1F C3 4.7F VCC
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R1 75.0 INPUT1B 7
GND
IN1B U1 MAX4029
OUT1
18
R9 75.0 R10 75.0 R11 75.0
OUTPUT1
R2 75.0 INPUT2A C6 0.1F 3
OUT2 IN2A OUT3
16
OUTPUT2
14
OUTPUT3
R3 75.0 INPUT2B C7 0.1F 8
OUT4 IN2B
11
R12 75.0 VCC 1 DISABLE 2 JU1 3
OUTPUT4
R4 75.0 INPUT3A C8 0.1F DISABLE 2 IN3A A/B C9 0.1F
19
VCC 1 2 A/B JU2
R5 75.0 INPUT3B 9
5 VCC
3
IN3B CLAMP/KEY_2 15
1 2 3
CLAMP/KEY_2 JU3 VCC 1 CLAMP/KEY_3 JU4
R6 75.0 INPUT4A C10 0.1F 1
IN4A CLAMP/KEY_3
12 VCC
2 3
R7 75.0 INPUT4B C11 0.1F CLAMP/KEY_4 10 IN4B KEYREF R8 75.0 20 6
1 2 3 R13 2.2k 5%
CLAMP/KEY_4 JU5
NOTE: ALL RESISTORS ARE 1%, UNLESS OTHERWISE NOTED.
R14 10k
Figure 2. MAX4029 EV Kit Schematic
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MAX4029 Evaluation Kit Evaluates: MAX4029
Figure 3. MAX4029 EV Kit Component Placement Guide--Component Side 6 _______________________________________________________________________________________
MAX4029 Evaluation Kit Evaluates: MAX4029
Figure 4. MAX4029 EV Kit PC Board Layout--Component Side
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MAX4029 Evaluation Kit Evaluates: MAX4029
Figure 5. MAX4029 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.
8 _____________________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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