Configuring The Board And The Adaq7768-1; Input Range Control - Analog Devices EVAL-ADAQ7768-1 User Manual

User Guide

CONFIGURING THE BOARD AND THE ADAQ7768-1

INPUT RANGE CONTROL

There are two ways to control the ADAQ7768-1 input range.
1. Through the GPIO of ADAQ7768-1, controlled over the SPI.
By default, the ACE software uses the GPIO to control the in-
►
put range. Configure the programmable-gain instrumentation
amplifier (PGIA) gain by clicking the PGIA icon in the Chip
View of the ACE software to select the input ranges. Once
done, click Apply Changes in the upper left corner for the
PGIA gain to take effect
Set S2 switches to low to properly control the device input
►
range using the GPIO.
2. Through the on-board mechanical switch, S2.
For this to work, check the Control PGIA with switch in the
►
PGIA gain section. Then, click the Apply Changes for this
to take effect, as shown in
Controlled indicator turned off).
See Table 5 for the proper switch settings. Note that when
►
choosing the manual input range control option, adjust the
PGIA Gain Value in the ACE software accordingly
20) for it to display the correct measurement result.
analog.com
(Figure 20).
Figure 21 (with PGIA Software
(Figure
Figure 20. Input Range Selection Menu
EVAL-ADAQ7768-1
Table 4. Configuration Switch (S2) Functions
Name Description
GAIN0, GAIN1,
GAIN2 (labeled A0, Gain mode/input range control for the ADAQ7768-1. See
A1, A2 on the Table 5 for more details. Set to low for GPIO input control
Revision A board) mode.
M0_FDA Reserved. Default low.
M1_FDA Reserved. Default low.
Table 5. PGIA Mode Settings
Gain Mode Differential Input
Setting Ranges (V)
Shutdown
Gain 0 ±12.603
Gain 1 ±6.302
Gain 2 ±3.151
Gain 3 ±1.575
Gain 4 ±0.788
Gain 5 ±0.394
Gain 6 ±0.197
GAIN2 GAIN1 GAIN0 Pin
Pin Logic Pin Logic Logic
High High High
High High Low
High Low High
High Low Low
Low High High
Low High Low
Low Low High
Low Low Low
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