ET9571

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 phototransistors in an emitter follower mode. Differential inputs enhance noise rejection and performance over temperature. Care should be taken to use phototransistors on www.DataSheet4U.com differential input pairs which have similar values of DC leakage current, as large differences in this charactersitic will affect waveform symmetry. ABSOLUTE MAXIMUM RATINGS Parameter Operating Temperature Range Supply Voltage Range Symbol TA VCC Min. -40 4.5 Max. 125 30 Units °C V Ref. Note 1 ETIC RESERVES THE RIGHT TO MAKE CHANGES AT ANY TIME TO IMPROVE THE DESIGN AND TO SUPPLY THE BEST PRODUCT. ©2000, Rev A1 iC-Haus GmbH Integrated Circuits Am Kuemmerling 18, D-55294 Bodenheim Page 1 of 2 Tel +49-6135-9292-0 Fax +49-6135-9292-192 http://www.ichaus.com ELECTRICAL CHARACTERISTICS Unless otherwise specifie...