TC7129 Datasheet | TelCom

1 TC7129 4-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTER WITH ON-CHIP LCD DRIVERS Features s s s s s s s s s 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 mon-Mode Rejection Ratio ......... 110 dB External Phase pensation Not Required 2 3 4 5 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 highresolution, 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 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 and a rangechange 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 bination of Features makes the TC7129 the ideal choice for full-featured multimeter and digital measurement applications. ORDERING INFORMATION Part No. TC7129CKW TC7129CLW TC7129CPL Pin...