General Description:
The TC7129 is a 4-1/2 digit Analog-to-Digital Converter (ADC) that directly drives a multiplexed Liquid Crystal Display (LCD). Fabricated in high-performance, low power CMOS, the TC7129 ADC is designed specifically for high-resolution, battery-powered digital multimeter applications. The traditional dual-slope method of A/D conversion has been enhanced with a succes sive integration technique to produce readings accurate to better than 0.005% of full-scale and resolution down to 10 μV per count.
The TC7129 includes features important to multimeter applications. It detects and indicates low battery condition. A continuity output drives an annunciator on the display and can be used with an external driver to sound an audible alarm. Overrange and underrange outputs, along with a range-change input, provide the ability to create auto-ranging instruments. For snapshot readings, the TC7129 includes a latch-and-hold input to freeze the present reading. This combination of features makes the TC7129 the ideal choice for full-featured multimeter and digital measurement applications.

Features:
• Count Resolution: ±19,999
• Resolution on 200 mV Scale: 10 μV
• True Differential Input and Reference
• Low Power Consumption: 500 μA at 9V
• Direct LCD Driver for 4-1/2 Digits, Decimal Points, Low Battery Indicator, and Continuity Indicator
• Overrange and Underrange Outputs
• Range Select Input: 10:1
• High Common Mode Rejection Ratio: 110 dB
• External Phase Compensation Not Required

Applications:
• Full-Featured Multimeters
• Digital Measurement Devices