EVAL-INAMP-82RZ Analog Devices Inc, EVAL-INAMP-82RZ Datasheet - Page 7

• Manufacturer Part Number: EVAL-INAMP-82RZ
• Description: AD8221/6/8/9 SO Pkg Eval Bd
• Manufacturer: Analog Devices Inc

Specifications of EVAL-INAMP-82RZ

• Channels Per Ic: 1 - Single
• Amplifier Type: Instrumentation
• Output Type: Single-Ended
• Slew Rate: 2 V/µs
• -3db Bandwidth: 1.5MHz
• Current - Output / Channel: 15mA
• Operating Temperature: -40°C ~ 85°C
• Current - Supply (main Ic): 750µA
• Voltage - Supply, Single/dual (±): 4.6 V ~ 36 V, ±2.3 V ~ 18 V
• Board Type: Fully Populated
• Utilized Ic / Part: AD8220
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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.)
Table 7. Factory Setting
Connection
W1 is soldered
Follow Step 1 through Step 3 to get started using these boards
(see Figure 3).
1.
2.
3.
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.
5V
1V p-p, 1kHz
Connect a ±2.3 V to ±15 V supply to +V
Drive the inputs with a signal.
Measure the output on a multimeter or oscilloscope. The
output voltage is the voltage measured between V
(OUT) and V
device, such as an ADC.
10µF
+IN
–IN
+IN
–IN
10µF
R1
0.1µF
Figure 4. Using an External Voltage Source to
Figure 3. EVAL-INAMP-82RZ Schematic
0.1µF
+IN 4
–IN 1
R
R
10V
G
G
REF
Set the Reference Level (Circled)
+
–
3
2
0V
(REF). The output can drive another
DUT
+
–
+V
S
DUT
+V
–V
–V
W1
S
S
S
8 +V
5 –V
W1
0.1µF
S
S
Purpose
REF is tied to ground
0.1µF
6 V
REF
7 V
REF
REF
OUT
5V
10µF
OUT
10µF
OUT
OSCILLOSCOPE
CONNECTOR
S
(OPTIONAL)
and –V
SMA/SMB
+ COM
S
OUT
.
Rev. A | Page 7 of 8
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
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-
tors prevent a dc current from flowing into the input transistors
of the instrumentation amplifier. Two matched 10 kΩ resistors
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.
OUTPUT
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.
500mV p-p,
10V p-p,
C1 +IN
C2 –IN
100Hz
10Hz
Figure 5. AC Input Coupling, Using a Resistive DC Return Path
10kΩ
Figure 6. Correct Output Connection Using the REF Pin
10µF
EVAL-INAMP-62RZ/82RZ/82RMZ
+IN
10µF
–IN
10kΩ
499Ω
5.49kΩ
0.1µF
R1
0.1µF
R1
+15V
+
–
+15V
DUT
+
–
+V
–V
S
S
DUT
+V
–V
W1
S
S
W1
–15V
0.1µF
–15V
0.1µF
OUT
REF
10µF
OUT
REF
10µF
OSCILLOSCOPE
OSCILLOSCOPE
+ COM
+ COM