3 CHANNEL DIFFERENTIAL AMPLIFIER-COMPARATOR (Phototransistor input version of the standard ET9570) ET9571 FEATURES • • • • • • Supply Voltage Range 4.
5V to 30V Designed for phototransistor inputs Index channel gated by A and B Current sink for LED drive (see application note APP-D2) Outputs short circuit protected 25mA peak drive current APPLICATIONS • • Optical Encoders Industrial Controls DESCRIPTION These devices are specifically designed as receiver circuits for the phototransistor signals available in some optical encoders.
Connect the emitters of the phototransistors to the input pins, with the collectors connected to Vcc.
The inputs have 330 ohm resistors to terminate the phototra...

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