10 MHz, 20 V/μs, G = 1, 10, 100, 1000 iCMOS

Programmable Gain Instrumentation Amplifier

Data Sheet

AD8253

Rev. B

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FEATURES

Small package: 10-lead MSOP

Programmable gains: 1, 10, 100, 1000

Digital or pin-programmable gain setting

Wide supply: ±5 V to ±15 V

Excellent dc performance

High CMRR: 100 dB (minimum), G = 100

Low gain drift: 10 ppm/°C (maximum)

Low offset drift: 1.2 μV/°C (maximum), G = 1000

Excellent ac performance

Fast settling time: 780 ns to 0.001% (maximum)

High slew rate: 20 V/μs (minimum)

Low distortion: −110 dB THD at 1 kHz,10 V swing

High CMRR over frequency: 100 dB to 20 kHz (minimum)

Low noise: 10 nV/√Hz, G = 1000 (maximum)

Low power: 4 mA

APPLICATIONS

Data acquisition

Biomedical analysis

Test and measurement

GENERAL DESCRIPTION

The AD8253 is an instrumentation amplifier with digitally

programmable gains that has gigaohm (GΩ) input impedance,

low output noise, and low distortion, making it suitable for

interfacing with sensors and driving high sample rate analog-to-

digital converters (ADCs).

It has a high bandwidth of 10 MHz, low THD of −110 dB, and

fast settling time of 780 ns (maximum) to 0.001%. Offset drift and

gain drift are guaranteed to 1.2 μV/°C and 10 ppm/°C, respectively,

for G = 1000. In addition to its wide input common voltage range,

it boasts a high common-mode rejection of 100 dB at G = 1000

from dc to 20 kHz. The combination of precision dc performance

coupled with high speed capabilities makes the AD8253 an

excellent candidate for data acquisition. Furthermore, this

monolithic solution simplifies design and manufacturing and

boosts performance of instrumentation by maintaining a tight

match of internal resistors and amplifiers.

The AD8253 user interface consists of a parallel port that allows

users to set the gain in one of two different ways (see Figure 1

for the functional block diagram). A 2-bit word sent via a bus

can be latched using the WR input. An alternative is to use

transparent gain mode, where the state of logic levels at the gain

port determines the gain.

FUNCTIONAL BLOCK DIAGRAM

A1

A0

DGND WR

AD8253

REF

OUT

+IN

LOGIC

10

8

3

7

4

5

6

2

9

Figure 1.

80

70

60

50

40

30

20

10

0

–10

–20

1k

10k

100k

1M

10M

100M

FREQUENCY (Hz)

G = 1000

G = 100

G = 10

G = 1

Figure 2. Gain vs. Frequency

Table 1. Instrumentation Amplifiers by Category

General

Purpose

Zero

Drift

Mil

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

The AD8253 is available in a 10-lead MSOP package and is

specified over the −40°C to +85°C temperature range, making it

an excellent solution for applications where size and packing

density are important considerations.