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EVAL-INAMP-62RZ/82RZ/82RMZ
QUICK START FOR THE EVAL-INAMP-82RZ AND EVAL-INAMP-82RMZ BOARDS
The quick start instructions in this section assume that the
evaluation board is in default condition as shown in Table 7.
Separate evaluation boards are available for the AD822x SOIC
for MSOP devices (see the Ordering Guide section.)
INPUT
The in-amp inputs should not be left floating, that is, with-
out a DC return path. This often occurs when the inputs are
connected to a transformer, a thermocouple, or a pair of series
Table 7. Factory Setting
Connection
W1 is soldered
Purpose
REF is tied to ground
capacitors. The inputs should have a dc path to ground, as
shown in Figure 4 and Figure 5.
The circuit shown in Figure 5 has series capacitors, C1 and C2,
between the signal generator and the input. The series capaci-
Follow Step 1 through Step 3 to get started using these boards
(see Figure 3).
tors prevent a dc current from flowing into the input transistors
of the instrumentation amplifier. Two matched 10 kΩ resistors
1.
2.
Connect a ±2.3 V to ±15 V supply to +V S and –V S .
Drive the inputs with a signal.
are used between the instrumentation amplifier inputs and
ground to provide the necessary current path. These resistors
should be closely matched to reduce offset and CMRR errors.
3.
Measure the output on a multimeter or oscilloscope. The
+V S
OSCILLOSCOPE
output voltage is the voltage measured between V OUT
(OUT) and V REF (REF). The output can drive another
+15V
0.1μF
10μF
+ COM
device, such as an ADC.
C1 +IN
+V S
0.1μF
10μF
C2 –IN
R1
499 ?
+
–
DUT
OUT
REF
+IN
–IN
R1
+IN 4
R G 3
R G 2
–IN 1
+
–
8 +V S
DUT
5 –V S
7 V OUT
6 V REF
REF
OUT
SMA/SMB
CONNECTOR
(OPTIONAL)
10k ?
10μF
10k ?
0.1μF
–V S
W1
–15V
10μF
0.1μF
W1
Figure 5. AC Input Coupling, Using a Resistive DC Return Path
OUTPUT
0.1μF
10μF
+IN
–V S
Figure 3. EVAL-INAMP-82RZ Schematic
REFERENCE
The reference level of the instrumentation amplifier can be set
by driving the REF pin with a precision voltage reference or by
using the solder jumper, W1. By default, W1 is soldered, shunting
REF to ground. If a reference voltage other than ground is used,
the solder must be removed from W1 before driving REF with
the reference voltage as shown in Figure 4.
+V S
OSCILLOSCOPE
Output measurements should be made by monitoring the
voltage between the OUT and REF tie points of the board as
shown in Figure 6. If an external voltage reference is used, the
output can be measured, referred to ground, as shown in Figure 4.
The evaluation board offers an SMA/SMB outline. By default,
the output voltage measured using an SMA/SMB connector is
with respect to ground.
+V S
OSCILLOSCOPE
+15V
+ COM
+IN
1V p-p, 1kHz
–IN
5V
10V
+
–
DUT
W1
0.1μF 10μF
OUT
REF
5V
+ COM
500mV p-p,
100Hz
10V p-p,
10Hz
–IN
10μF
R1
5.49k ?
0.1μF
+
–
DUT
–V S
W1
–15V
OUT
REF
10μF
0.1μF
0V
–V S
Figure 6. Correct Output Connection Using the REF Pin
Figure 4. Using an External Voltage Source to
Set the Reference Level (Circled)
Rev. A | Page 7 of 8
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