Quick Start

Recommended Equipment

•

3V to 3.6V, 500mA DC power supply (VDD)

•

Video signal generator

•

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

700T)

Procedure

The MAX9532 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) Connect the power supply ground to the GND pad

on the EV kit.

2) Connect the 3V to 3.6V supply to the VDD pad on

the EV kit.

3) Connect the output of the video signal generator to

the IN BNC connector on the EV kit. The video signal

must be biased such that the sync tip is at ground;

refer to Application Note 4028:

How to Level Shift

Video Signals for DC-Coupled Video Amplifiers/Filters

for more information on level shifting video signals.

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

the input of the video measurement equipment.

5) Set the video signal generator for the desired video

input signal. This signal must contain sync information.

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

nal generator.

7) Analyze the video output signal with the VM-700T

video measurement equipment.

Detailed Description of Hardware

The MAX9532 EV kit is a fully assembled and tested sur-

face-mount circuit board that evaluates the MAX9532

IC. The MAX9532 amplifies and sets the black level near

ground for standard-definition video signals while con-

suming minimal power. The MAX9532 also provides

integrated short-to-battery protection, allowing the out-

put of the device to survive shorts up to 18V. The EV kit

operates from a 3V to 3.6V single power supply.

The MAX9532 has an internal reconstruction filter that

smoothes the steps and reduces the spikes on the

video signal from the video digital-to-analog converter

(DAC). The reconstruction filter typically has 42dB

attenuation at 27MHz and a ±1dB passband flatness to

9.5MHz.

The MAX9532 provides an internal fixed gain of 4V/V.

The MAX9532 EV kit accepts an input full-scale video

nal), and provides an output full-scale video signal of

Video input and output signals from the EV kit are DC-

coupled, eliminating large DC-blocking capacitors. The

input of the EV kit has a 75Ω termination to ground and

the output has a 75Ω back-termination resistor.

The input of the MAX9532 can be directly connected to

the output of a video DAC. The MAX9532 also features

a transparent input sync-tip clamp, allowing AC-cou-

pling of input signals with different DC biases.

Short-Circuit and Short-to-Battery

Protection

The MAX9532 EV kit circuit includes a 75Ω back-termi-

nation resistor that limits short-circuit current when an

external short is applied to the video output. The

MAX9532 also features an internal output short-circuit

protection to prevent device damage in prototyping

and applications where the amplifier output can be

directly shorted to ground.

To protect the device from output short circuits to volt-

ages higher than the supply voltage (VDD), the MAX9532

utilizes an internal switch in series with the amplifier out-

put. When the JACKSENSE input detects that the output

connector of the circuit is shorted to the battery voltage

(up to 18V) higher than the internal 8V threshold, an inter-

nal comparator disables the switch in 10µs (typ) prevent-

ing the MAX9532 from being damaged.

After the output is shorted to a battery, the output

immediately resumes normal operation when the short

is removed within 1ms. When the output is shorted to

the battery for longer than 1ms, the output resumes nor-

mal operation 10ms after the short is removed.

AC-Coupled Input

The default setting of the MAX9532 EV kit is set for a

DC-coupled input; however, this kit is configured for an

AC-coupled input as well. To change the input setting

to AC-coupled, remove R4 and utilize the 0.1µF ceram-

ic capacitor installed at C3.

Interfacing to Video DACs that Produce

The MAX9532 EV kit is designed to work with devices

applied at IN and attenuates it by 1/2, through resistor-

signal at the input pin of the MAX9532 IC.

When using a device that provides a video signal other

resistor and an appropriate termination must be applied

at R1.

MAX9532 Evaluation Kit

2

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