12MHz 20V/μs G=1,2,5,10 Programmable

Gain iCMOS™ Instrumentation Amplifier

Preliminary Technical Data

AD8250

Rev.PrB

Information furnished by Analog Devices is believed to be accurate and reliable.

However, no responsibility is assumed by Analog Devices for its use, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective companies.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.326.8703

© 2006 Analog Devices, Inc. All rights reserved.

FEATURES

Easy to Use

Programmable Gains: 1, 2, 5, 10

Digital or Pin Programmable Gain Setting

Temp Range -40

°C to 85°C

EXCELLENT DC PERFORMANCE

High CMRR 100dB G=10

Low Gain Drift: 10ppm/

°C

Low Offset Drift: 1uV/

°C

Low Offset: 70uV G=10

EXCELLENT AC PERFORMANCE

Fast Settle Time: 0.5us to 0.01%

High Slew Rate: 20V/μs

High CMRR over Frequency: 80dB to 50kHz

Low Noise: 13nV

√Hz, G=10

Low Power: 3.5 mA (typ)

Supply:

±5V to ±12V

Applications

Data Acquisition

Bio-Medical Analysis

Test and Measurement

High Performance System Monitoring

A1

A0

DGD

WR

Logic

AD8250

OUT

+VS

-VS

REF

+IN

-IN

Figure 1. Functional Block Diagram

1GHz

100MHz

10MHz

1MHz

100kHz

10kHz

1kHz

100Hz

30

20

10

0

-10

-20

-30

Frequency

Figure 2. Gain vs Frequency

GENERAL DESCRIPTION

The AD8250 is a digitally gain programmable

instrumentation amplifier that has high GΩ input

impedance and low distortion making it suitable for sensor

interfacing and driving high sample rate analog to digital

converters. It has high bandwidth of 12MHz, low distortion

and settle time of 0.5us to 0.01%. Offset drift and gain drift

are limited to 1uV/°C and 10ppm/°C respectively. In

addition to its wide input common-voltage range, it boasts a

high common-mode rejection of 80dB at G=1 from DC to

50kHz. The combination of precision DC performance

coupled with high speed capabilities make the AD8250 an

excellent candidate for data acquisition and medical

applications. Furthermore, this monolithic solution

simplifies design, manufacturing and boosts performance of

instrumentation by maintaining tight match of internal

resistors and amplifiers.

The AD8250’s user interface comprises of a parallel port that

allows users to set the gain in one of three different ways. A

two bit word sent to A1 and A2, via a bus may be latched

1μs by using the gain port in transparent mode where the

state of A0 and A1 directly set the gain. The last method is

to strap A1 and A2 to a high or low voltage potential,

permanently setting the gain.

The AD8250 is available in a 10 pin MSOP package and

specified over -40°C to 85°C, making it an excellent solution

for applications where size and packing density are