MAX4090EVKIT データシートの表示（PDF） - Maxim Integrated

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MAX4090EVKIT

MAX4090 Evaluation Kit

Maxim Integrated 

MAX4090 Evaluation Kit

Quick Start

Recommended Equipment

• 5V, 50mA DC power supply (VCC)

• Video signal generator (e.g., Tektronix TG-700 or

similar)

• Video measurement equipment (e.g., Tektronix VM-

700T or similar)

Procedure

The MAX4090 EV kit is fully assembled and tested.

Follow the steps below to verify board operation.

Caution: Do not turn on the power supply until all

connections are completed.

1) Verify that a shunt is installed on jumper JU1 in the

1-2 position (MAX4090A enabled).

2) Connect the output of the video signal generator to

the IN BNC connector on the MAX4090 EV kit.

3) Connect the OUT BNC connector on the EV kit to the

input of the video measurement equipment.

4) Connect the power-supply ground to the GND pad

on the EV kit.

5) Connect the 5V DC power supply to the VCC pad on

the EV kit.

6) Set the video signal generator for the desired video

input signal.

7) Turn on the power supply and enable the video sig-

nal generator.

8) Analyze the video output signal with the video mea-

surement equipment.

Detailed Description of Hardware

The MAX4090 evaluation kit (EV kit) provides a proven

design to evaluate the MAX4090 3V/5V, 6dB video buffer

with sync-tip clamp. The MAX4090 video input terminals

have a 75Ω termination resistor to ground, and the out-

put terminals have a 75Ω back-termination resistor.

The MAX4090 EV kit uses the sag correction configura-

tion. The video input and output signals on the EV kit

are AC-coupled.

The MAX4090 can also be used to drive DC-coupled,

150Ω back-terminated video loads in portable video

applications. See the Output Signal section to use the

MAX4090 as a DC-coupled output driver.

Output Signal

By default, the MAX4090 EV kit is configured in the sag

correction configuration and the output is AC-coupled.

To DC-couple the outputs, short the C3 and C4 capaci-

tors. To AC-couple the output without using the sag cor-

rection configuration, short the C3 and C4 capacitors,

cut the short on C5, and install a 220µF capacitor on C5.

Jumper Selection

Shutdown Mode (SHDN)

Jumper JU1 controls the shutdown pin (SHDN) of the

MAX4090A IC. See Table 1 for shunt positions.

Table 1. JU1 Jumper Selection (SHDN)

SHUNT

POSITION

DESCRIPTION

1-2*

SHDN pin connected to VCC

MAX4090A enabled

2-3

SHDN pin connected to GND

MAX4090A in shutdown mode

*Default position.

2 _______________________________________________________________________________________

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