Table 6-1. Commonly Used Gains and Resistor Values

DESIRED GAIN (V/V)

RG (Ω)

NEAREST 1% RG VALUE (Ω)

5

NC

(1)

NC

(1)

10

40k

40.2k

20

13.33k

13.3k

50

4.444

4.42k

100

2105

2.1k

200

1026

1.02k

500

404

402

1000

201

200

2000

100.3

100

5000

40

40.2

10000

20

20

(1)

NC: No connection

6.3.2 Input Common-Mode Range

The input common-mode range of the INA122 can operate over a wide range of power supply and VREF

configurations. The common-mode range for some common operating conditions is shown in the performance

curves in the Typical Characteristics section, and also in Figure 6-3 and Figure 6-4.

Figure 6-3. Input Common-Mode Range vs Output

Voltage, Vs = ±15V, G = 5

Figure 6-4. Input Common-Mode Range vs Output

Voltage, Vs = ±5, G = 5

6.3.3 Input Protection

The inputs of the INA122 are protected with internal diodes connected to the power supply rails shown in Figure

6-1. The diodes clamp the applied signal to prevent damaging the input circuitry. If the input signal source

voltage exceeds the power supplies by more than 0.3V, limit the source current with a series input resistor to

less than 5mA to protect the internal clamp diodes. Some signal sources are inherently current-limited and do

not require limiting resistors.

6.3.4 Output Current Range

Output sourcing and sinking current values versus the output voltage ranges are shown in the Typical

Characteristics section. The positive and negative current limits are not equal. Positive output current sourcing

can drive moderate to high load impedance. Battery operation normally requires the careful management of

power consumption to keep load impedance very high throughout the design.

INA122

SBOS069A – OCTOBER 1997 – REVISED DECEMBER 2024

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