BUY ICL7135CPI https://www.utsource.net/itm/p/325772.html
4 Digit A/D Converter with Multiplexed BCD Outputs
The ICL7135CPI is an integrated circuit (IC) from Intersil Corporation. It is a monolithic CMOS analog-to-digital converter (ADC) with a built-in voltage reference. It is packaged in a 28-pin dual in-line package (DIP). Features: * 8-bit resolution * On-chip voltage reference * Low power consumption * Single +5V supply * High speed conversion * TTL/CMOS compatible logic levels Applications: * Digital voltmeters * Digital panel meters * Digital tachometers * Digital thermometers * Digital pressure gauges * Digital scales * Digital control systems (For reference only)