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19-3540; Rev 0; 1/05
MAX7454 Evaluation Kit
General Description
The MAX7454 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains a MAX7454. The MAX7454 is a triple video reconstruction filter and buffer for high-definition (HD) and standarddefinition (SDi and SDp) television applications. The filter cutoff frequency is programmable to 30MHz (HDTV) or 10MHz (SDTV) applications. The MAX7454 includes a +6dB output buffer capable of driving a 2VP-P video signal into a standard 150 load. Video input signals to the EV kit can be DC-coupled, or AC-coupled with a user-provided DC clamp-bias voltage. The EV kit's input terminals can be 75 or highimpedance terminated. The EV kit's output terminals can be series terminated with a 75 resistor or connected directly to the load. The EV kit operates from a single 5V power supply. The MAX7454 EV kit can also evaluate the MAX7455. o Single 5V Supply Operation o Output Buffer Drives a 150 Standard Video Load with a +6dB Gain o High-Definition TV 30MHz Filter o Standard-Definition TV 10MHz Filter o Input DC-Coupled or AC-Coupled with UserProvided DC Clamp-Bias Voltage o Standard 75 Input/Output Termination o Also Evaluates the MAX7455 o Surface-Mount Components o Fully Assembled and Tested
Features
Evaluates: MAX7454/MAX7455
Component List
DESIGNATION QTY C1, C2 2 DESCRIPTION 0.01F 10%, 50V X7R ceramic capacitors (0603) TDK C1608X7R1H103K 1F 10%, 10V X5R ceramic capacitors (0603) TDK C1608X5R1A105K 0.1F 10%, 25V X7R ceramic capacitors (0603) TDK C1608X7R1E104K 75V, 150mA, high-speed switching diodes (SOD-123) Central Semiconductor CMHD4448 75.0 1% resistors (0805) 10M 5% resistors (0805) MAX7454UUP (20-pin TSSOP with exposed paddle) PART MAX7454EVKIT
Ordering Information
TEMP RANGE 0C to +70C* IC PACKAGE 20 TSSOP-EP**
C3, C4, C8, C9, C10
*This limited temperature range is for the EV kit PC board only. The MAX7454 IC temperature range is 0C to +85C. **EP = Exposed paddle.
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Quick Start
Recommended Equipment
* * * * 5V, 1A DC power supply (VCC) 200mV to 500mV, 10mA biasing supply (clamp biasing) Video signal generator (e.g., Tektronix TG-2000) Video measurement equipment (e.g., Tektronix VM-700A)
C5, C6, C7
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D1, D2, D3 R1-R6 R7, R8, R9 U1 INPUT1, INPUT2, INPUT3, OUTPUT1, OUTPUT2, OUTPUT3 JU1-JU5 JU6-JU11 None None
3 6 3 1
Procedure
The MAX7454 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 2 and 3 of jumper JU1 (HDTV). 2) Verify that a shunt is installed across pins 1 and 2 of jumper JU2 (HD high frequency). 3) Verify that a shunt is installed across pins 2 and 3 of jumper JU3 (channel 1 video input signal is ACcoupled with a DC clamp-bias voltage).
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75 BNC PC board-mount jack connectors
5 6 11 1
3-pin headers 2-pin headers Shunts (see Tables 1-4 for jumper selection) MAX7454 PC board
____________________________ 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.
MAX7454 Evaluation Kit Evaluates: MAX7454/MAX7455
Component Suppliers
SUPPLIER Central Semiconductor TDK PHONE 631-435-1110 847-803-6100 FAX 631-435-1824 847-390-4405 WEBSITE www.centralsemi.com www.component.tdk.com
Note: Indicate that you are using the MAX7454 EV kit when contacting these suppliers.
4) Verify that a shunt is installed across jumper JU6. (Channel 1 video input signal is terminated at 75.) 5) Verify that a shunt is NOT installed across jumper JU9. (Channel 1 video output signal passes through a 75 series termination resistor.) 6) Connect the output of the video signal generator to the INPUT1 BNC connector on the MAX7454 EV kit. 7) Connect the OUTPUT1 BNC connector on the EV kit to the input of the video measurement equipment. 8) Connect both power-supply grounds to the EV kit's GND pads. 9) Connect the 5V supply to the VCC pad on the EV kit. 10) Connect the 200mV to 500mV biasing supply to the CLAMP_BIAS_1 pad on the EV kit. Set the biasing supply to 400mV initially. 11) 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). 12) Turn on both power supplies, and enable the video signal generator. 13) Analyze the video output signal with the VM-700A video measurement equipment.
change. The DC clamp-bias voltage must be in the 200mV to 500mV range. This biasing network is intended for the input signal with sync (i.e., Y or CVBS). For bipolar input signals (i.e., Pb, Pr, C), replace the diode with a resistor that is greater than 1M. Each of the EV kit's input terminals can be 75 or highimpedance terminated. The EV kit's output terminals can be series terminated with a 75 resistor or directly connected to the load. All three video inputs and outputs on the EV kit are identical. The EV kit can also evaluate the MAX7455 after replacing the IC (U1). See the Evaluating the MAX7455 section for further details.
Jumper Selection
Frequency Selection
The MAX7454 EV kit features an option to set the -3dB cutoff frequency of the reconstruction filter. Jumpers JU1 and JU2 select the filter frequency of the MAX7454. Table 1 lists the selectable jumper options.
Table 1. JU1 and JU2 Jumper Selection
JU1 SHUNT POSITION SD/HD PIN 2-3 (SD/HD = low) 2-3 (SD/HD = low) 1-2 (SD/HD = high) 1-2 (SD/HD = high) JU2 SHUNT POSITION FSEL PIN 2-3 (FSEL = low) 1-2 (FSEL = high) 2-3 (FSEL = low) 1-2 (FSEL = high) EV KIT FUNCTION HD low frequency HD high frequency SD low frequency SD high frequency
Detailed Description
The MAX7454 EV kit is a fully assembled and tested surface-mount circuit board that contains the MAX7454. The MAX7454 is a configurable, triple video reconstruction filter and buffer for HD, SDi, and SDp TV applications. The filter cutoff frequency is programmable with jumpers. The device includes a +6dB output buffer capable of driving a 2VP-P video signal into a standard 150 load. Each of the three input signals to the EV kit can be DCcoupled, or AC-coupled with a user-provided DC clampbias voltage. Each DC clamp-bias network consists of two capacitors, one diode, and one resistor. One of the capacitors is used to decouple the biasing source, while the other capacitor is used to AC-couple the input signal. The diode is used to clamp the negative peak of the input signal. The resistor is used to provide a bias current to charge the input capacitor on startup and/or step
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Input Coupling
The MAX7454 EV kit features an option to individually select the video input-signal coupling for each input channel. Each input channel to the EV kit can be DCcoupled, or AC-coupled with a user-provided DC clamp-bias voltage. Jumpers JU3, JU4, and JU5 set the input coupling for channels 1, 2, and 3, respectively. Table 2 lists the selectable jumper options. For the Pb, Pr, or C input signals, set jumpers JU3, JU4, or JU5 to pins 2 and 3, and replace diodes D1, D2, or D3 with a resistor that is greater than 1M.
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MAX7454 Evaluation Kit
Table 2. JU3, JU4, and JU5 Jumper Selection
SHUNT POSITION 1-2 2-3 INPUT CHANNEL COUPLING DC AC with user-provided DC clampbias voltage (200mV to 500mV) at the CLAMP_BIAS_X* pads
Input Termination
The MAX7454 EV kit features an option to individually terminate each video input channel to 75 or high impedance. Jumpers JU6, JU7, and JU8 select each input termination for channels 1, 2, and 3, respectively. Table 3 lists the selectable jumper options.
Evaluates: MAX7454/MAX7455
Output Termination
The MAX7454 EV kit features an option to individually terminate each video output channel to 75 or direct connection. Jumpers JU9, JU10, and JU11 select each output termination for channels 1, 2, and 3, respectively. Table 4 lists the selectable jumper options.
*Where X is 1, 2, or 3.
Table 3. JU6, JU7, and JU8 Jumper Selection
SHUNT POSITION Installed Not installed VIDEO INPUT TERMINATION 75 High impedance
Evaluating the MAX7455
The MAX7454 EV kit can also evaluate the MAX7455. To evaluate the MAX7455, replace IC U1 with a MAX7455 and refer to the MAX7454/MAX7455 data sheet for the IC specifications.
Table 4. JU9, JU10, and JU11 Jumper Selection
SHUNT POSITION Installed Not installed VIDEO OUTPUT TERMINATION Direct connection 75
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MAX7454 Evaluation Kit Evaluates: MAX7454/MAX7455
VCC 10 C3 1F C1 0.01F 11 19 16 VCC C4 1F GND C2 0.01F 18 15 12 C5 0.1F JU6 R1 75 1% GND GND GND FSEL 9 JU2 13 GND SD/HD VCC VCC
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JU1
1 2 3
VCC VCC VCC VCC
1 2 3
INPUT1
1 2 3
JU3 R7 10M C8 1F
2
IN1 JU9
U1
D1 CLAMP_BIAS_1
MAX7454
OUT1 20
R4 75 1%
OUTPUT1
INPUT2 JU7 R2 75 1%
C6 0.1F
1 2 3
JU10 JU4 R8 10M C9 1F 4 IN2 17 R5 75 1%
OUTPUT2
OUT2 D2 CLAMP_BIAS_2
JU11 C7 0.1F JU8 R3 75 1% R6 75 1%
INPUT3
1 2 3
JU5 R9 10M C10 1F
6
IN3 GND GND GND
OUT3 GND
14
OUTPUT3
D3 CLAMP_BIAS_3
1
3
5
7
GND
Figure 1. MAX7454 EV Kit Schematic
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MAX7454 Evaluation Kit Evaluates: MAX7454/MAX7455
Figure 2. MAX7454 EV Kit Component Placement Guide--Component Side
Figure 3. MAX7454 EV Kit PC Board Layout--Component Side
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MAX7454 Evaluation Kit Evaluates: MAX7454/MAX7455
Figure 4. MAX7454 EV Kit PC Board Layout--Solder Side
Figure 5. MAX7454 EV Kit Component Placement Guide--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) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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