7 Detailed Description

7.1 Overview

The INA600 is a voltage-sensing difference amplifier with precision matched resistors that offer attenuating gain

options. The precision matched integrated resistors saves bill of materials (BOM) costs and board space by

removing the need for precise and low-tolerance external resistors. The device achieves ±0.05% maximum gain

error, 5ppm/°C maximum gain drift, and 92dB of minimum common-mode rejection ratio (G = 1/5). The INA600

does not typically require calibration when used in 8-bit to 10-bit systems. Further calibration of offset and gain

error at a system level helps improve system resolution and accuracy, enabling use in higher resolution systems.

High input impedance of >1MΩ with just 65μA of quiescent current makes the INA600 very useful in single-cell,

battery-monitoring applications. Referred to negative rail, the device handles input voltages up to –40V to +85V

and attenuates the voltage down with great accuracy. The device rejects any common-mode errors such as

ground bounce, switching ripples, and AC mains and is capable of interfacing the attenuated voltage to the

low-voltage, low-speed ADCs. Most errors (including offset, offset drift, CMRR, and noise) are referred to the

output. Doing so enables easy calculation of the signal-to-noise ratio (SNR) and effective number of bits (ENOB)

closer to the analog-to-digital converter (ADC).

The INA600 is offered in six attenuating gain options across six variants. The INA600A version offers the

lowest attenuation gain option of 1/5, whereas the INA600F offers the highest attenuation gain option of 1/36.

The INA600 gain options are designed for level translation applications that interface with a wide variety of

differential and single-ended high-voltage signals. Differential signals include ±24V, ±12V, ±10V, ±5V, and so

forth. Single-ended signals include 0V to 48V, 0V to 24V, 0V to 12V, 0V to 10V, 0V to 5V, and so forth, These

high-voltage signals are level translated into a wide variety of low-voltage (0V to 5V, 0V to 3.3V, 0V to 2.5V, and

so forth) ADC ranges. This is useful in a variety of end equipments and applications where multiple high-voltage

signals and supply domains are monitored. Examples include battery testers, solar string inverters, power tools,

analog input modules, and battery energy storage systems. The device also has enough bandwidth (≥200kHz) to

directly drive low-speed (≤10kSPS) ADCs.

The INA600 is designed for space-constrained applications such as robotics, power banks, and chargers. As

such, the device saves valuable PCB area compared to the discrete implementation of difference amplifiers. For

easy use in automotive and industrial applications, the device is available in standard, leaded packages such as

SOT-23 and SC70.

7.2 Functional Block Diagram

+

–

RIN

V+

OUT

V─

IN─

IN+

REF

Based on gain

Based on gain

RIN

Figure 7-1. INA600 Simplified Internal Schematic

INA600

SBOSAM3A – JULY 2025 – REVISED AUGUST 2025

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