Output Voltage (V)

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INA293A1

INA293A2

INA293A3

INA293A4

INA293A5

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INA293

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SBOS470 – DECEMBER 2019

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Feature Description (continued)

Figure 35. Bandwidth vs Output Voltage

7.3.1.2 Low Input Bias Current

The INA293 inputs draw a 20-µA (typical) bias current at a common-mode voltage as high as 110 V, which

enables precision current sensing on applications that require lower current leakage.

beneficial when using low ohmic shunts for low current measurements, as power losses across the shunt are

significantly reduced.

7.3.1.4 Wide Fixed Gain Output

The INA293 gain error is < 0.15% at room temperature, with a maximum drift of 10 ppm/°C over the full

temperature range of –40°C to +125°C. The INA293 is available in multiple gain options of 20 V/V, 50 V/V, 100

V/V, 200 V/V, and 500 V/V, which the system designer should select based on their desired signal-to-noise ratio

and other system requirements.

The INA293 closed-loop gain is set by a precision, low drift internal resistor network. The ratio of these resistors

are excellently matched, while the absolute values may vary significantly. Adding additional resistance around

the INA293 to change the effective gain is not recommended, however, because of this variation. The typical

values of the gain resistors are described in Table 1.

Table 1. Fixed Gain Resistor

GAIN

R1

RL

20 (V/V)

25 kΩ

500 kΩ

50 (V/V)

10 kΩ

500 kΩ

100 (V/V)

10 kΩ

1000 kΩ

200 (V/V)

5 kΩ

1000 kΩ

500 (V/V)

2 kΩ

1000 kΩ

7.3.1.5 Wide Supply Range

The INA293 operates with a wide supply range from 2.7 V to 20 V. The output stage supports a wide output

range while INA293x1 (gain of 20 V/V) at a supply voltage of 20 V allows a maximum acceptable differential

input of 1 V. When paired with the small input offset voltage of the INA293, systems with very wide dynamic

range of current measurement can be supported.