AM457 datasheet(3/10 Pages) AME

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Precision amplifier for bridge circuits

AM457

analog microelectronics

May 2005

Analog Microelectronics GmbH

Phone: +49 (0)6131/91 073 – 0

3/10

An der Fahrt 13, D – 55124 Mainz

Fax:

+49 (0)6131/91 073 – 30

Rev. 2.2

Internet: www.analogmicro.de

Email:

info@analogmicro.de

FEATURES

• High input sensitivity

• Wide differential input voltage range

(

±5...±100mV FS)

• Low offset

• Low offset drift

• Low input noise

• High CMRR: > 120dB

• Wide operating temperature range:

-40... +125°C

• Adjustable output voltage

• Rail-to-rail output stage:

VOUT = 0.2V ... Vcc – 0.2V

• Sink/source output

• Single ratiometric supply: VCC = 5V

• Integrated current source: ≤ 2mA

• Integrated diagnostic unit

• Separate function groups

• Integrated EMV protective circuitry

• Short-circuit-proofing

• Small-scale design

GENERAL DESCRIPTION

AM457 is a high-precision integrated amplifier which

has been developed to condition signals from small

differential input voltages within a range of a few

millivolts (

±5 to ±100mV FS). The chief component

of the IC is a highly accurate, low-noise amplifier

circuit (AMP). An additional integrated operational

amplifier (OP) can be used to supply a sensing

element with current or record temperature for sensor

bridges powered by voltage, for example. The entire

system (sensing element plus amplifier) is monitored

by the integrated diagnostic unit which logs any

sensing

element

errors

defects,

system

undervoltage,

AMP

overloads

and

excessive

temperature. The various function groups are not

mutually dependent on one another; the AMP can be

operated independently of the OP, for example. The

functionality of both component groups (AMP and

OP) is autonomous with regard to the diagnostic unit.

AM457 is a combination of high-impedance precision

amplifier, additional OP and extensive diagnostic unit,

enabling a self-monitoring sensor system to be

assembled using very few components.

BLOCK DIAGRAM

AMP

Temp

AM457

Diagnostic

unit

OUTOP

IN+

INOP

GND

OUT

DIAG

VCC

Figure 1: Block diagram

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