INA821 datasheet(1/52 Pages) TI

Part #	INA821

Description	INA851 Precision, Low-Noise, Fully Differential Output Instrumentation Amplifier With Attenuating Gain and Output Clamping

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Manufacturer	TI [Texas Instruments]

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INA851 Precision, Low-Noise, Fully Differential Output Instrumentation Amplifier

With Attenuating Gain and Output Clamping

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 super-

beta 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.

Package Information

PART NUMBER

PACKAGE(1)

BODY SIZE (NOM)

INA851

RGT (VQFN, 16)

3.00 mm × 3.00 mm

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

+

–

RG

VS+

OUT+

VS

IN

IN+

RG+

OUT

VOCM

R2

R1

R3

R4

R5

R7

G02

(1)

G02+

(1)

3 k

5 k

3 k

5 k

1.25 k

R6

R8

5 k

1.25 k

LDO

VCLAMP+

VCLAMP

RG

ADC

INP

INN

FDA_IN

FDA_IN+

+

–

+

INA851

5 V

4

3

2

1

16

15

14

13

7

5

6

9

10

11

12

Overvoltage

Protection

Overvoltage

Protection

+

–

Short OUT

to G02

and OUT+ to G02+ for

output stage G = 0.2 option.

VIN+

VIN

VDD

VSS

VS

VS+

VOCM

(1)

G = GIN * GOUT

GOUT = 0.2 or 1

GIN =

6 k

RG

1 +

INA851 ADC Driver Application

INA851

SBOS999A – MARCH 2022 – REVISED OCTOBER 2022

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

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