Precision Instrumentation Amplifier

with Signal Processing Amplifiers

AD8295

Rev. 0

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FEATURES

Saves board space

Includes precision in-amp, 2 op amps, and

2 matched resistors

4 mm × 4 mm LFCSP

No heat slug for more routing room

Differential output fully specified

In-amp specifications

Gain set with 1 external resistor (gain range: 1 to 1000)

8 nV/√Hz @ 1 kHz, maximum input voltage noise

90 dB minimum CMRR (G = 1)

0.8 nA maximum input bias current

1.2 MHz, −3 dB bandwidth (G = 1)

2 V/μs slew rate

Wide power supply range: ±2.3 V to ±18 V

1 ppm/°C, 0.03% resistor matching

APPLICATIONS

Industrial process controls

Wheatstone bridges

Precision data acquisition systems

Medical instrumentation

Strain gages

Transducer interfaces

Differential output

CONNECTION DIAGRAM

A1 OUT

A1 R2

A2 +IN

A2 –IN

–IN

OUT

REF

+IN

1

2

3

4

8

7

6

5

13

14

15

16

A1

IA

A2

R1

20kΩ

R2

20kΩ

A2 OUT

AD8295

A1 +IN

A1 R1

A1 –IN

12

11

10

9

Figure 1.

Table 1. Instrumentation Amplifiers by Category

General

Purpose

Zero

Drift

Military

Grade

Low

Power

High Speed

PGA

AD82201

AD82311

AD620

AD6271

AD8250

AD8221

AD85531

AD621

AD6231

AD8251

AD8222

AD85551

AD524

AD82231

AD8253

AD82241

AD85561

AD526

AD8228

AD85571

AD624

AD8295

AD82931

GENERAL DESCRIPTION

The AD8295 contains all the components necessary for a

precision instrumentation amplifier front end in one small

4 mm × 4 mm package. It contains a high performance

instrumentation amplifier, two general-purpose operational

amplifiers, and two precisely matched 10 kΩ resistors.

The AD8295 is designed to make PCB routing easy and

efficient. The AD8295 components are arranged in a logical

way so that typical application circuits have short routes and

few vias. Unlike most chip scale packages, the AD8295 does not

have an exposed metal pad on the back of the part, which frees

additional space for routing and vias. The AD8295 comes in a

4 mm × 4 mm LFCSP that requires half the board space of an

8-pin SOIC package.

The AD8295 includes a high performance, programmable gain

instrumentation amplifier. Gain is set from 1 to 1000 with a

single resistor. The low noise and excellent common-mode

rejection of the AD8295 enable the part to easily detect small

signals even in the presence of large common-mode interference.

For a similar instrumentation amplifier without the associated

signal conditioning circuitry, see the AD8221 or AD8222 data

sheet.

The AD8295 operates on both single and dual supplies and is

well suited for applications where ±10 V input voltages are

encountered. Performance is specified over the entire industrial

temperature range of −40°C to +85°C for all grades. The

AD8295 is operational from −40°C to +125°C; see the Typical

Performance Characteristics section for expected operation up

to 125°C.