1 Features

? Gain programmable from

G = 0.2 to 10,000 by using external resistor

? Fully differential outputs with integrated clamping

? Low offset voltage: 10 μV (typ), 35 μV (max)

? Low offset drift: 0.1 μV/°C (typ), 0.3 μV/°C (max)

? Low input bias current: 5 nA (typ)

? Input stage noise: 3.2 nV/√Hz, 0.8 pA/√Hz

? Wide bandwidth: 22 MHz at G = 0.2,

15 MHz at G = 1

? Common-mode rejection: 106 dB (min) at G = 10,

120 dB (min) at 100 ≤ G ≤ 1000

? Power supply rejection: 110 dB (min) at G = 1

? Supply current: 6 mA (typ)

? Input overvoltage protection to ±40 V beyond

supplies

? Supply range:

– Single supply: 8 V to 36 V

– Dual supply: ±4 V to ±18 V

? Specified temperature range: –40°C to +125°C

? Tiny package: 16-pin VQFN

2 Applications

? Analog input module

? Flow transmitter

? LCD test

? Electrocardiogram (ECG)

? Surgical equipment

? Oscilloscope (DSO)

? Weigh scale

? Semiconductor test

3 Description

The INA851 is the industry's first high-precision

instrumentation amplifier with fully differential outputs.

This device is optimized to drive inputs of modern

high performance analog-to-digital converters (ADCs)

with fully differential inputs. The INA851 operates over

a very-wide, single-supply or dual-supply range. The

output stage gain can be set to either 0.2 or to 1 by

shorting or floating two pins. A single external resistor

sets any input stage gain from 1 to 10,000.

Compared to other amplifiers in the same class,

the INA851 offers very-low input bias current and

low input-referred current noise as a result of superbeta

input transistors. A state-of-the-art manufacturing

process provides exceptionally low voltage noise,

input offset voltage, and offset voltage drift. Additional

circuitry protects the device inputs against overvoltage

up to ±40 V beyond the power-supply voltages.The

device outputs feature built-in clamping circuitry to

protect the ADC or downstream device against

overdrive damage.

The device is designed for operation from either

an 8-V minimum single or ±4-V dual supply, and a

maximum of 36-V single or ±18 V dual supply.

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