IC-MSA Datasheet, PDF(2/29 Page) IC-Haus GmbH – SIN/COS SIGNAL CONDITIONER with AGC and 1Vpp DRIVER

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IC-MSA Datasheet, PDF (2/29 Pages) IC-Haus GmbH – SIN/COS SIGNAL CONDITIONER with AGC and 1Vpp DRIVER

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iC-MSA SIN/COS SIGNAL

preliminary

CONDITIONER with AGC and 1Vpp DRIVER

Rev A1, Page 2/29

DESCRIPTION

iC-MSA is a signal conditioner with line drivers for

sine/cosine sensors which are used to determine po-

sitions in linear and angular encoders, for example.

Programmable instrumentation ampliï¬ers with se-

lectable gain levels permit differential or referenced

input signals; at the same time the modes of op-

eration differentiate between high and low input

impedance. This adaptation of the iC to voltage or

current signals enables MR sensor bridges or photo-

sensors to be directly connected up to the device.

The integrated signal conditioning unit allows signal

amplitudes and offset voltages to be calibrated accu-

rately and also any phase error between the sine and

cosine signals to be corrected. Separate zero signal

conditioning settings can be made for the gain and

offset; data is then output either as an analog or a

differential square-wave signal (low/high level analo-

gous to the sine/cosine amplitude).

For the stabilization of the output levels a signal is

generated from the conditioned and calibrated input

signals which controls the gain of all channels. Tem-

perature and aging effects can be compensated for

and the set signal amplitude is maintained with ab-

solute accuracy. At the same time the control cir-

cuitry monitors both whether the sensor is functioning

correctly and whether it is properly connected; signal

loss due to wire breakage, short circuiting, dirt or ag-

ing, for example, is recognized when control thresh-

olds are reached and indicated at alarm output ERR.

iC-MSA is protected against a reversed power supply

voltage; the integrated voltage switch for loads of up

to 20 mA extends this protection to cover the overall

system. The analog output drivers are directly cable-

compatible and tolerant to false wiring; if supply volt-

age is connected up to these pins, the device is not

destroyed.

The device conï¬guration and calibration parameters

are CRC protected and stored in an external EEP-

ROM; they are loaded automatically via the I2C in-

terface once the supply voltage has been connected

up.

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