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BUY ICL7109CPL https://www.utsource.net/itm/p/302864.html
12-Bit, Microprocessor- Compatible A/D Converter
Description: The ICL7109CPL is a 40-pin DIP monolithic integrated circuit intended for use as a programmable A/D converter in portables and desk-top systems. Features: Low Power CMOS Technology Internal Clock Differential Linearity Error: ±1/2 LSB Max Internal Reference with 4mV Adjustment Range Overrange Indication Power-On Reset Single +5V Supply Operation Enhanced Reliability Low Cost High Precision Applications: Programmable Systems Instrumentation Process Control Battery Powered Systems Data Acquisition Systems Medical Equipment (For reference only)