AM417 datasheet(3/18 Pages) WOLFSPEED

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AM417 – Ratiometric instrumentation

amplifier with adjustable output stage

Analog Microelectronics GmbH

An der Fahrt 13, D – 55124 Mainz

July 2008 –Rev 3.1- Page 3/18

Phone:+49 (0)6131/91 073-0

Fax: +49 (0)6131/91 073-30

Internet: http://www.analogmicro.de

Email: info@analogmicro.de

FEATURES

• Instrumentation amplifier input for

positive input voltages: 0...200mV

• Adjustable gain

• Common mode input range (CMIR):

1.3…VCC - 2.2V

• Output voltage ratiometric to the

supply: 0.5...4.5V

• Low offset

• Low offset drift

• Supply voltage range:

± 5% (ratiometric range)

• Wide operating temperature range:

-40°C...+125°C

• Ratiometric current source for the

supply of external measuring cells

• Output driver (PNP open collector):

IOUT = +11mA

• No limited resolution

• Output current limitation

• Low internal noise

• Integrated EMC protection

• Small SO8 package

• Low cost

DESCRIPTION

AM417 is a low-cost ratiometric interface IC

which has been specifically designed for the

conditioning of differential signals. The IC is

particularly suitable for the signal evaluation of

sensor elements which have to be powered by

an internal current source (OP). These include

piezoresistive and magnetoresistive silicon

measuring cells and temperature sensing

elements based on a resistor setup. In essence

AM417 consists of a precision instrumentation

amplifier, a ratiometric operational amplifier

and a protected voltage output which has been

configured as a driver stage. The amplifier can

be adjusted across a wide range using two

external resistors and the offset of an additional

resistor affixed to the measuring bridge.

Precision

amplifier

AM417

has

been

engineered in such a way that it can be used as

an instrumentation amplifier for follow-on

processors or A/D converters to make optimum

use of the converter range.

BLOCK DIAGRAM

AM417

Output-

stage

IN+

IN-

VCC

VOUT

9 R

GND

Figure 1: Block diagram of AM417.

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