Evaluation Board User Guide
UG-861
Rev. 0 | Page 3 of 6
EVALUATION BOARD HARDWARE
INTRODUCTION
The
AD8147-EVALZ
/
AD8148-EVALZ
evaluation board allows
the user to easily evaluate the
AD8147
/
AD8148
in both single
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 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.
QUICK START GUIDE
To begin, take the following steps:
1.
Remove the
AD8147
/
AD8148
from the box.
2.
C5 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
video receiver, take the following steps:
1.
C5 V to VCC, −5 V to VEE, and GND to the
center pin of P2 of the
AD8143
/
AD8145
evaluation board.
2.
Connect a Cat-5 UTP cable between P2 and P1 of the
AD8143
/
AD8145
evaluation board.
3.
Connect an oscilloscope or a display/monitor to J1 of the
AD8143
/
AD8145
evaluation board through a VGA cable.
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.
+
–
+
–
–
–
DC POWER SUPPLY
VIDEO RECEIVER
(AD8143/AD8145)
ANALOG
OUTPUT
ANALOG
INPUT
VIDEO PATTERN GENERATOR
133
62-
0
02
Figure 2. Typical Evaluation Setup
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