TC7129

TC7129 4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers Features: Count Resolution: ±19,999 Resolution on 200 mV Scale: 10 V True Differential Input and Reference Low Power Consumption: 500 A 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 Device Selection Table Package Code Pin Layout Package TC7129CPL TC7129CKW TC7129CLW Normal Formed – 40-Pin PDIP 44-Pin PQFP 44-Pin PLCC Temperature Range 0C to +70C 0C to +70C 0C to +70C Typical Application Low Battery 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, lowpower 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 successive integration technique to produce readings accurate to better than 0.005% of full-scale and resolution down to 10 V 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 ...