7.3 Feature Description

7.3.1 Gain Options and Resistors

The gain value of the INA600 is given by the ratio of feedback resistor and input resistor. The gain options

are offered across different device variants as provided in Table 7-1. While the typical value of input and

feedback resistors are shown in the following table, it is important to note that these values can vary together

by approximately ±15% while maintaining tighter gain error (tolerance) numbers as specified in the Electrical

Characteristics table.

Table 7-1. Gain Selection

DEVICE

VERSION

INPUT RESISTOR

FEEDBACK

RESISTOR

GAIN

INA600

A

1.2MΩ

240kΩ

1/5

B

1.2MΩ

120kΩ

1/10

C

1.2MΩ

100kΩ

1/12

D

1.2MΩ

66.66kΩ

1/18

E

1.2MΩ

50kΩ

1/24

F

1.2MΩ

33.33kΩ

1/36

7.3.1.1 Gain Error and Drift

Gain error in the INA600 is dictated by the mismatch of the integrated precision resistors. Gain error is a tested

parameter and maximum gain error is under or at ±0.05% for all gains. Gain drift of the INA600 is limited by

the mismatch of the temperature coefficient of the integrated resistors. Maximum gain drift is under 5ppm/°C for

all gains. These integrated resistors are already precision matched with low temperature coefficient resistors.

Thus, the overall gain drift is much better in comparison to discrete implementation of difference amplifiers built

using external resistors. Gain drift is not a tested parameter and the maximum gain drift is specified based on

characterization results with sufficient guard banding. Maximum gain error of ±0.05% is expected for inputs from

the reference pin that sets output common-mode voltage.

7.3.2 Input Common-Mode Voltage Range

The INA600 difference amplifier rejects the input common mode. This rejection capability is largely based on

the matching of the internal resistors. The INA600 input voltage range is extended well beyond the supply rails

using a special design technique. This technique causes the input voltage range not to be overly limited by gain

configuration or supply voltage. The input voltage range spans from –40V below the negative rail to +85V above

the negative rail for supply voltages starting from 9V across all gains. Below 9V, see the valid input range values

within the Electrical Characteristics table for the gain option of interest.

Common-mode rejection ratio values are referred to the output to enable easy error calculation with respect to

the ADC full scale. For example, a 1V input common-mode error signal at the INA600A input (G = 1/5) at a 12V

supply is attenuated to 2μV at the INA600A output. In this example, the typical CMRR specification (referred to

output) is 114dB starting from a 9V supply.

7.3.3 EMI Rejection

The INA600 uses integrated electromagnetic interference (EMI) filtering to reduce the effects of EMI from a

variety of sources. These sources include wireless communications and densely-populated boards with a mix of

analog signal chain and digital components. Texas Instruments accurately measures and quantifies the immunity

of an operational amplifier over a broad frequency spectrum extending from 10MHz to 6GHz. The EMI Rejection

Ratio of Operational Amplifiers application note is available for download from www.ti.com. This application note

contains detailed information on the topic of EMIRR performance relating to op amps.

www.ti.com

INA600

SBOSAM3A – JULY 2025 – REVISED AUGUST 2025

Copyright © 2025 Texas Instruments Incorporated

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