Intersil

ICL7109 - 12-Bit Microprocessor Compatible A/D Converter

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Features 12-Bit Binary Dual Slope Integrating Analog-to-Digital Converter Byte-Organized, TTL Compatible Three-State Outputs and UART Handshake Mode for Simple Parallel or Serial Interfacing to Microprocessor Systems RUN/HOLD Input and STATUS Output Can Be Used to Monitor and Control Conversion Timing True Differential Input and Differential Reference Operates At Up to 30 Conversions/s

Pin Description Pin Number Description 1 GND - Digital Ground 2 STATUS - Status of Analog Conversion 3 POL - Polarity 4 OR - Overrange 5 B12 - Output Bit (Most Significant) 6 B11 - Output Bit 7 B10 - Output Bit 8 B9 - Output Bit 9 B8 - Output Bit 10 B7 - Output Bit 11 B6 - Output Bit 12 B5 - Output Bit 13 B4 - Output Bit 14 B3 - Output Bit 15 B2 - Output Bit 16 B1 - Output Bit (Least Significant) 17 TEST - Test Function 18 LBEN - Low Byte Enable 19 HBEN - High Byte Enable 20 CE/LOAD - Chip Enable Load 21 MODE - See Data Sheet 22 OSC IN - Oscillator Input 23 OSC OUT - Oscillator Output 24 OSC SEL - Oscillator Select 25 BUF OSC OUT - Buffered Oscillator Output 26 RUN/HOLD - A/D Conversion 27 SEND - Data Send Signal Input 28 V- - Analog Negative Supply 29 REF OUT - Reference Voltage Output 30 BUFFER - Buffer Amplifier Output 31 AUTO-ZERO - Auto-Zero Node 32 INTEGRATOR - Integrator Output 33 COMMON - Analog Common 34 INPUT LO - Differential Input Low 35 INPUT HI - Differential Input High 36 REF IN + - Differential Input Reference (Positive) 37 REF CAP + - Reference Capacitor (Positive) 38 REF CAP - - Reference Capacitor (Negative) 39 REF IN - - Differential Input Reference (Negative) 20 V+ - Positive Supply Voltage

Pin Layout Dimensional Drawing

Technical Data Data Sheet Harris - Data Sheet for ICL7109 Application Notes