AD8555 Analog Devices, AD8555 Datasheet

AD8555

Manufacturer Part Number

AD8555

Description

Zero-Drift, Single-Supply, Sensor Signal Amplifier with Digitally Programmable Gain and Offset

Manufacturer

Analog Devices

Datasheet

1.AD8555.pdf (28 pages)

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FEATURES

Very low offset voltage: 10 µV maximum over temperature

Very low input offset voltage drift: 60 nV/°C maximum

High CMRR: 96 dB minimum

Digitally programmable gain and output offset voltage

Single-wire serial interface

Open and short wire fault detection

Low-pass filtering

Stable with any capacitive load

Externally programmable output clamp voltage for driving

LFCSP-16 and SOIC-8 packages

2.7 V to 5.5 V operation

−40°C to +125°C operation

APPLICATIONS

Automotive sensors

Pressure and position sensors

Thermocouple amplifiers

Industrial weigh scales

Precision current sensing

Strain gages

GENERAL DESCRIPTION

The AD8555 is a zero-drift, sensor signal amplifier with digi-

tally programmable gain and output offset. Designed to easily

and accurately convert variable pressure sensor and strain

bridge outputs to a well-defined output voltage range, the

AD8555 also accurately amplifies many other differential or

single-ended sensor outputs. The AD8555 uses the ADI pat-

ented low noise auto-zero and DigiTrim® technologies to create

an incredibly accurate and flexible signal processing solution in

a very compact footprint.

Gain is digitally programmable in a wide range from 70 to 1,280

through a serial data interface. Gain adjustment can be fully

simulated in-circuit and then permanently programmed with

proven and reliable poly-fuse technology. Output offset voltage

is also digitally programmable and is ratiometric to the supply

voltage.

Rev. 0

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 owners.

low voltage ADCs

Zero-Drift, Digitally Programmable

In addition to extremely low input offset voltage and input off-

set voltage drift and very high dc and ac CMRR, the AD8555

also includes a pull-up current source at the input pins and a

pull-down current source at the VCLAMP pin. This allows open

wire and shorted wire fault detection. A low-pass filter function

is implemented via a single low cost external capacitor. Output

clamping set via an external reference voltage allows the

AD8555 to drive lower voltage ADCs safely and accurately.

When used in conjunction with an ADC referenced to the same

supply, the system accuracy becomes immune to normal supply

voltage variations. Output offset voltage can be adjusted with a

resolution of better than 0.4% of the difference between VDD

and VSS. A lockout trim after gain and offset adjustment further

ensures field reliability.

The AD8555AR is fully specified over the extended industrial

temperature range of −40°C to +125°C. Operating from

single-supply voltages of 2.7 V to 5.5 V, the AD8555 is offered in

the narrow 8-lead SOIC package and the 4 mm × 4 mm

16-lead LFCSP.

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

Tel: 781.329.4700

Fax: 781.326.8703

VNEG

VPOS

VDD

VSS

VDD

VSS

FUNCTIONAL BLOCK DIAGRAM

Sensor Signal Amplifier

VDD

DAC

VSS

Figure 1.

VDD

VSS

VCLAMP

DIGOUT

FILT/

www.analog.com

VDD

VSS

AD8555

VDD

VSS

VOUT

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