Evaluation Board Quick Start Procedures; Initial Setup; Initial Connections; Powering Up The Ad8338 - Analog Devices AD8338-EVALZ User Manual

Evaluation Board User Guide

EVALUATION BOARD QUICK START PROCEDURES

INITIAL SETUP

The AD8338 evaluation board needs only a few external
connections. Setting up this board for the first time requires
the following:
• A dc supply to power the evaluation board from 6 V to
20 V (6 V is preferred)
• Cables to connect the board to the signal source
• Cables to connect the board to the oscilloscope

INITIAL CONNECTIONS

First, connect two SMA to BNC cables from the output SMA
connectors (OUTP, OUTM) to the oscilloscope. Set the
oscilloscope to 1 MΩ input impedance. The
specified to drive 50 Ω impedances; therefore, it must drive a
high impedance load.
When using the AD8338
differential in and out, set up the signal source as a differential
output using two channels. Set the phase of the first channel to
be in phase and set the second channel to be out of phase (180°).
DIFFERENTIAL
OUTPUT
SIGNAL
SOURCE
Figure 2. Basic Connections for the
POWERING UP THE
Take the following steps to power up the
board:
1. Before applying any signals or supplies, set the jumpers to
their default settings, as indicated on the printed circuit
board (PCB).
2. Set the power supply to 6 V.
3. Enable the output.
4. Set the output amplitude on the signal generator to 0.1 V
on each channel (200 mV difference amplitude). Note
that the AD8338-EVALZ
terminators.
5. Adjust the potentiometer (labeled GAIN ADJ) counter-
clockwise until stopped.
6. Enable the outputs.
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AD8338
in standalone mode, which is fully
-
OSCILLOSCOPE
AD8338
EVALUATION BOARD
AD8338 Evaluation Module,
Differential Mode
AD8338
AD8338 evaluation
board includes on-board 50 Ω
Upon correct configuration, the output signal appears on the
oscilloscope. Manually adjust gain by adjusting the GAIN ADJ
potentiometer. If these work, then basic operation of the
AD8338-EVALZ
CONFIGURING FOR SINGLE-ENDED INPUT,
DIFFERENTIAL OUTPUT
The AD8338-EVALZ
differential driver amplifier. Bring this amplifier into the signal
chain through the setting of the J5, J6, J7, and J8 jumpers as
highlighted in Figure 3.
When these jumpers (J5 to J7 and J8) are set, the input
connectors (J3 and J4) are disconnected from the AD8338, and
is not
fed into the ADA4940-1. Input Connector J4 becomes inert and
is no longer necessary and Input Connector J3 becomes the
single-ended input source. The
gain difference.
Rev. B | Page 3 of 8
is verified.
is equipped with the ADA4940-1
ADA4940-1
Figure 3. AD8338-EVALZ Board with Jumpers Set for
Single-Ended Input Mode
UG-559
operates in unity-