Evaluation Board Hardware; Introduction; Power Supply; Analog Inputs - Analog Devices AD8147-EVALZ User Manual

Evaluation Board User Guide

EVALUATION BOARD HARDWARE

INTRODUCTION

The AD8147-EVALZ/AD8148-EVALZ
the user to easily evaluate the
and dual supply operation and through a Cat-5 UTP cable.
Figure 2 shows the typical bench setup used to evaluate the
triple differential drivers.

POWER SUPPLY

This evaluation board requires either a single +5 V or a dual
±2.5 V/±5 V power supply. Connectors J1 and J2 in the evaluation
board must be set according to the supply used. If using a ±5 V
power supply, follow the connections shown in Figure 2.

ANALOG INPUTS

Drive the input, P1, with a video pattern generator, a video signal,
or any signal source that can provide an input voltage of ±5 V
for a ±5 V supply and 0 V to 5 V for single 5 V or ±2.5 V supply.

ANALOG OUTPUT

The output of the evaluation board, P2, produces differential
red (R), green (G), and blue (B) signals that are approximately ±3 V
for ±5 V supplies and approximately ±1 V using ±2.5 V supplies.
The waveform signal from this output can be checked using a
signal analyzer, such as an oscilloscope or a display/monitor.

OUTPUT PULL-DOWN (OPD) LOGIC INPUT

The OPD pin is a binary input that controls the state of the outputs.
Its binary input level is referenced to GND. When the OPD input is
driven to its low state, the output is enabled and operates normally.
When the OPD input is driven to its high state, the outputs of the
drivers are forced to a low voltage, thus presenting high impedance.
VIDEO PATTERN GENERATOR
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evaluation board allows
AD8147/AD8148 in both single
ANALOG
INPUT
+ – – + – –
DC POWER SUPPLY
Figure 2. Typical Evaluation Setup

QUICK START GUIDE

To begin, take the following steps:
1. Remove the AD8147/AD8148
2. Connect +5 V to VS+, −5 V to VS−, and GND to GND
(the center pin of P3).
3. Connect a shunt onto the ±5 V or +5 V side of both J1 and
J2. Connect another shunt on the opposite side of OPD of J3.
4. Connect a video signal from a monitor/laptop or video
pattern generator on P1 (VGA port).
Using the AD8143/AD8145
1. Connect +5 V to VCC, −5 V to VEE, and GND to the
center pin of P2 of the
2. Connect a Cat-5 UTP cable between P2 and P1 of the
AD8143/AD8145
3. Connect an oscilloscope or a display/monitor to J1 of the
AD8143/AD8145
4. Turn on the power supply. The typical current of VCC/VS+
is 143 mA; the typical current of VEE/VS− is −122 mA.
5. The output must produce the same signal as the input.
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UG-861
from the box.
video receiver, take the following steps:
AD8143/AD8145 evaluation board.
evaluation board.
evaluation board through a VGA cable.
VIDEO RECEIVER
(AD8143/AD8145)
ANALOG
OUTPUT