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EVAL-INAMP-62RZ/82RZ/82RMZ
QUICK START FOR THE EVAL-INAMP-62RZ BOARD
CIRCUIT OPTIONS
Table 3. AD623 Gain Resistor Values
Single-Supply Operation
A jumper is provided to select between single or dual power
supplies. The evaluation board is shipped with W14 in the dual-
supply position. To convert to single supply, place W14 in the
position marked with a ground symbol.
Gain Adjustment
The gain of the AD621 is pin selectable where G = 1 (default) or
G = 100 (strap Pin 1 and Pin 8). In contrast, the gain of the AD620,
AD622, and AD623 devices is resistor dependent (the resistor is
connected between the R G pins). Without a resistor, the gain is
unity. Table 1 to Table 3 provide calculated gains for each device.
See the individual product data sheet for the gain equations.
Table 1. AD620 Gain Resistor Values
Desired
Gain
2
5
10
20
33
40
50
65
100
200
500
1000
1% Standard
Value of R G (Ω)
100 k
24.9 k
11 k
5.23 k
3.09 k
2.55 k
2.05 k
1.58 k
1.02 k
499
200
100
Calculated
Gain
2
5.02
10.09
20.12
33.36
40.21
49.78
64.29
99.04
201.4
501
1001
1% Standard
Value of R G (Ω)
49.9 k
12.4 k
5.49 k
2.61 k
1.00 k
499
249
100
49.9
Calculated
Gain
1.990
4.984
9.998
19.93
50.40
100.0
199.4
495.0
991.0
0.1% Standard
Value of R G (Ω)
49.3 k
12.4 k
5.49 k
2.61 k
1.01 k
499
249
98.8
49.3
Calculated
Gain
2.002
4.984
9.998
19.93
49.91
100.0
199.4
501.0
1003.0
External Reference or Offset Adjustment
When shipped, the reference of the EVAL-INAMP-62RZ board is
connected to ground. Certain single-supply applications (for
example, an ADC connected to the output of the in-amp) require
a symmetrical output voltage centered on a nonzero value. The
reference can be equal to half the supply, or an application-specific
voltage can be provided by an ADC. The user can install a jumper
at W13 and connect an external reference to the EXT_REF pin. To
maintain proper operation of the in-amp, the reference should be
provided by a voltage source.
Similarly, a provision is made for an offset adjustment of ±1.12 V
Table 2. AD622 Gain Resistor Values
by installing the parts listed in Table 6. Although the A2 and A3 ICs
Desired
Gain
2
5
10
20
33
40
50
65
100
200
500
1000
1% Standard
Value of R G (Ω)
51.1 k
12.7 k
5.62 k
2.67 k
1.58 k
1.3 k
1.02 k
787
511
255
102
51.1
Calculated
Gain
1.988
4.976
9.986
19.91
32.96
39.85
50.50
65.17
99.83
199.0
496.1
989.3
can be used with a single or dual power supply connection, A1
requires a dual supply. To enable the offset feature, install a shunt
in Position W11. To adjust the offset of the in-amp, ground both
inputs and measure the output voltage. Adjust Potentiometer R1
for 0 V.
LOAD RESISTOR
Although not required for normal operation, a load resistor can
be inserted at Position R8.
Rev. A | Page 4 of 8
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