Intersil

ICL7135 - 4 1/2 Digit BCD Output, A/D Converter

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Features Accuracy Guaranteed to ±1 Count Over Entire ±20000 Counts Guaranteed Zero Reading for 0V Input 1pA Typical Input Leakage Current True Differential Input True Polarity at Zero Count for Precise Null Detection Single Reference Voltage Required Overrange and Underrange Signals Available for Auto-Range Capability All Outputs TTL Compatible Blinking Outputs Gives Visual Indication of Overrange Six Auxiliary Inputs/Outputs are Available for Interfacing to µP Multiplexed BCD Outputs

Pin Description Pin Number Description 1 V- - Negative Supply 2 REFERENCE - Reference Input 3 ANALOG COMM - Analog Common 4 INT OUT - Integrator Output 5 AZ IN - Auto-Zero Input 6 BUFF OUT - Buffer Output 7 REF CAP- - Reference Capacitor 8 REF CAP+ - Reference Capacitor 9 IN LO - Input Low 10 IN HI - Input High 11 V+ - Positive Supply 12 D5 - Digit Drive 13 B1 - BCD Output 14 B2 - BCD Output 15 B4 - BCD Output 16 B8 - BCD Output 17 D4 - Digit Drive 18 B3 - Digit Drive 19 D2 - Digit Drive 20 D1 - Digit Drive 21 BUSY - A/D Busy 22 CLOCK IN - Clock Input 23 POL - Polarity Output 24 DIG GND - Digital Ground 25 R/H - Run/Hold 26 STR - Strobe 27 OR - Overrange 28 UR - Underrange

Pin Layout Dimensional Drawing

Technical Data Data Sheet Harris - Data Sheet for ICL7135 Application Notes The Integrating A/D Converter Low Cost Digital Panel Meter Designs and Complete Instructions for LCD and LED Kits Display Driver Family Combines Convenience of Use with Microprocessor Interfaceability Overcoming Common Mode Range Issues When Using Intersil Integrating Converters