iC-OG

8-BIT DIFFERENTIAL SCANNING OPTO ENCODER

Rev C1, Page 2/9

DESCRIPTION

The iC-OG device is an optoelectronic detector IC for linear and angle measuring systems, such as glass

scales or shaft encoders, for example. Photodiodes, amplifiers, comparators and TTL-compatible push-pull

output drivers are integrated monolithically. Each of the 8 tracks is evaluated differentially; there are also

analog outputs available from three of the special feature tracks.

The integrated LED current control with a driver stage enables a transmit diode with series resistor to be

directly connected and ensures a constant optical received power. The setpoint for the receive current is

adjusted using an external resistor. Should the LED current control deviate from its working range, this is

reported at the error message output.

Two test pins allow a full test of all functions to be carried out excluding the photodiodes.

All push-pull and analog outputs are protected against ESD and short-circuit damage. The error message

output NER is also protected against short-circuiting and can be used in bus systems due to its open-collector

output.