AM452 – Voltage-to-current transducer IC

with a differential input

Analog Microelectronics GmbH

An der Fahrt 13, D – 55124 Mainz

February 2008 - Rev 1.2 - Page 1/21

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

Fax:

+49 (0)6131/91 073-30

Internet: http://www.analogmicro.de

Email: info@analogmicro.de

PRINCIPLE FUNCTION

Amplification and conversion of differential input voltages (±400mV with a CMIR

of 1.5 – VCC-3V) into an adjustable current output of 0/4...20mA, for example. The

offset and maximum output currents are independently adjustable in a wide range.

The IC is suitable for both 2- and 3-wire applications and as a HART® carrier IC.

TYPICAL APPLICATIONS

Transducers for differential input signals in current output values for:

• Transducers for sensor applications with an internal sensing element supply

• Drivers for the analog industrial power grid (e.g. remote display in current loop operation)

• Differential impedance converters

• Carrier for standard HART® protocol communications

• Modular signal conditioning with digital correction (Frame concept [1])

I

OUT = z.B.0/4...20mA

AM452

V

CC = 6…35V

I

S = max 10mA

Differential input

mV

00

± 4

V

REF= 5/10V