INA351 datasheet(29/40 Pages) TI

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Output Voltage (V)

-0.6

0.6

1.2

1.8

2.4

3.6

4.2

4.8

5.4

-0.6

0.6

1.2

1.8

2.4

3.6

4.2

4.8

5.4

D09_

VS = 5.5 V

G = 10, 20, 30, 50

VREF = 0 V

Figure 9-5. Input Common-Mode Voltage vs Output Voltage (High CMRR Region)

An additional series resistor in the Wheatstone bridge string (R1) may or may not be required, and can be

decided based on the intended output voltage swing for a particular combination of supply voltage, reference

voltage and the selected gain for an input common mode voltage range. R1 helps adjust the input common-

mode voltage range, and thus can help accommodate the intended output voltage swing. In this particular

example, it is not required and can be shorted out.

9.2.1.3 Application Curves

The following typical characteristic curve is for the circuit in Figure 9-4.

Bridge Resistance R + 'R (:)

5000 5200 5400 5600 5800 6000 6200 6400 6600 6800 7000

0.3

0.6

0.9

1.2

1.5

1.8

2.1

2.4

2.7

0.30

0.27

0.24

0.21

0.18

0.15

0.12

0.09

0.06

0.03

D100

VOUT

VDIFF

Figure 9-6. Input Differential Voltage, Output Voltage vs Bridge Resistance

9.3 Power Supply Recommendations

The nominal performance of the INA351 is specified with a supply voltage of ±2.75 V and midsupply reference

voltage. The device also operates using power supplies from ±0.85 V (1.7 V) to ±2.75 V (5.5 V) and non-

midsupply reference voltages with excellent performance. Parameters can vary significantly with operating

voltage and reference voltage.

9.4 Layout

9.4.1 Layout Guidelines

Attention to good layout practices is always recommended. For best operational performance of the device, use

the following PCB layout practices:

• Make sure that both input paths are well-matched for source impedance and capacitance to avoid converting

common-mode signals into differential signals.

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INA351

SBOSAD5 – DECEMBER 2022

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