Description
The ICL7109 is a high performance, CMOS, low power integrating A/D converter designed to easily interface with microprocessors.
The output data (12 bits, polarity and over-range) may be directly accessed under control of two byte enable inputs and a chip select input for a single parallel bus interface.

FEATUREs
• 12-Bit Binary (Plus Polarity and Over-Range) 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
• True Differential Input and Differential Reference
• Low Noise (Typ)  . . . . . . . . . . . . . . . . . . . . . . . . 15µVP-P
• Input Current (Typ) . . . . . . . . . . . . . . . . . . . . . . . . . .1pA
• Operates At Up to 30 Conversions/s
• On-Chip Oscillator Operates with Inexpensive 3.58MHz TV Crystal Giving 7.5 Conversions/s for 60Hz Rejection. May Also Be Used with An RC Network Oscillator for Other Clock Frequencies