Output Voltage (V)

0

1

2

3

200

400

600

800

1000

1200

1400

INA293A1

INA293A2

INA293A3

INA293A4

INA293A5

Figure 7-1. Bandwidth vs Output Voltage

7.3.1.2 Low Input Bias Current

The INA293-Q1 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.

particularly 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-Q1 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-Q1 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-Q1 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-Q1 to change the effective gain is not recommended, however, because of this variation. The

typical values of the gain resistors are described in Table 7-1.

Table 7-1. 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-Q1 operates with a wide supply range from 2.7 V to 20 V. The output stage supports a wide output

range while INA293-Q1x1 (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-Q1, systems with very wide dynamic

range of current measurement can be supported.

INA293-Q1

SBOS870A – MAY 2019 – REVISED SEPTEMBER 2020

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