INA848 Ultra-Low-Noise (1.5 nV/√Hz), High-Bandwidth Instrumentation Amplifier

With Fixed Gain of 2000

1 Features

• Fixed gain of 2000 V/V

• Access to internal nodes for filtering

• Ultra-low noise: 1.5 nV/√Hz input voltage noise

(maximum)

• Precision super-beta input performance:

– Low offset voltage: 35 µV (maximum)

– Low offset voltage drift: 0.45 μV/°C (maximum)

– Low input bias current: 25 nA (typical)

– Low gain drift: 5 ppm/°C (maximum)

• Bandwidth: 2.8 MHz

• Slew rate: 45 V/µs

• Common-mode rejection: 132 dB (minimum)

• Supply range:

– Single supply: 8 V to 36 V

– Dual supply: ±4 V to ±18 V

• Specified temperature range:

–40°C to +125°C

• Package: 8-pin SOIC

2 Applications

• Surgical equipment

• Electrocardiogram (ECG)

• Ultrasound scanner

• Semiconductor test

• Data acquisition (DAQ)

• Vibrational analysis

3 Description

The INA848 is a fixed-gain instrumentation amplifier

optimized for high-precision measurements, such as

very-small, fast, differential input signals. TI's super-

beta topology provides a very low input bias current

and current noise. The well-matched transistors help

achieve a very low offset and offset drift. Matching of

the internal resistors yields a high common-mode

rejection ratio of 132 dB across the full input-voltage

range, and a very low gain drift error of 5 ppm/⁰C

(max).

The current-feedback topology of the INA848

produces a wide bandwidth of 2.8 MHz at a fixed gain

of 2000, thereby eliminating the need for subsequent

gain stages. The very-low noise floor of 1.3 nV/√Hz

minimizes the impact on the equivalent number of bits

(ENOB) when interfacing with high-resolution analog-

to-digital converters (ADCs). The INA848 provides the

flexibility of adding filters between the gain stages

(pins 2 and 3) to maintain an adequate signal integrity.

These unique features of the INA848 make this

device an excellent choice for applications requiring

high-precision measurements, such as high-end

medical

instrumentation,

electroencephalography,

vibration sensing, and displacement measurements.

This device is designed for 8-V to 36-V single

supplies, or ±4-V to ±18-V on dual supplies.

Device Information

PART NUMBER(1)

PACKAGE

BODY SIZE (NOM)

INA848

SOIC (8)

4.90 mm × 3.91 mm

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

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±

+

±

+

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6 k

3 k

120 k

6 k

120 k

3 k

REF

+VS

OUT

-VS

-IN

+IN

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IN

IN

REF

V

2000 V

V

V

u

:

:

:

:

1

2

2

3 k

G

1

200

30.15

120 k

G

10

12 k

6 k

6 k

+FL

-FL

30.15

INA848

INA848 Simplified Internal Schematic

Typical Distribution of Input Offset Voltage

www.ti.com

INA848

SBOS946 – SEPTEMBER 2020

Copyright © 2020 Texas Instruments Incorporated

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INA848

SBOS946 – SEPTEMBER 2020

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.