G = 50, CMOS Sensor Amplifier

with Current Excitation

AD8290

Rev. B

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

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

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

©2007–2008 Analog Devices, Inc. All rights reserved.

FEATURES

Supply voltage range: 2.6 V to 5.5 V

Low power

1.2 mA + 2× excitation current

0.5 μA shutdown current

Low input bias current: ±100 pA

High CMRR: 120 dB

Space savings: 16-lead, 3.0 mm × 3.0 mm × 0.55 mm LFCSP

Excitation current

300 μA to 1300 μA range

Set with external resistor

APPLICATIONS

Bridge and sensor drives

Portable electronics

GENERAL DESCRIPTION

The AD8290 contains both an adjustable current source to

drive a sensor and a difference amplifier to amplify the signal

voltage. The amplifier is set for a fixed gain of 50. The AD8290

is an excellent solution for both the drive and the sensing aspects

required for pressure, temperature, and strain gage bridges.

In addition, because the AD8290 operates with low power,

works with a range of low supply voltages, and is available in a

low profile package, it is suitable for drive/sense circuits in

portable electronics as well.

The AD8290 is available in a lead free 3.0 mm × 3.0 mm ×

0.55 mm package and is operational over the industrial

temperature range of −40°C to +85°C.

FUNCTIONAL BLOCK DIAGRAM

14

15

13

11

6

5

3

4

10

2

ADC

ANTI-

ALIASING

FILTER

GND

ENBL

AD8290

NC

NC

NC

NC

NC

NC

16

1

12

9

7

8

Figure 1.