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TC7129

TelCom
Part Number TC7129
Manufacturer TelCom
Description 4-1/2 Digit Analog-to-Digital Converters
Published Aug 21, 2005
Detailed Description 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 .....
Datasheet PDF File TC7129 PDF File

TC7129
TC7129

Overview
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 .
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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 .
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10:1 High Common-Mode Rejection Ratio .
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110 dB External Phase Compensation 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 combination of features makes the TC7129 the ideal choice for full-featured multimeter and digital measurement applications.
ORDERING INFORMATION Part No.
TC7129CKW TC7129CLW TC7129CPL Pin Layout Formed — Normal Package 44-Pin PQFP 44-Pin PLCC 40-Pin PDIP Temperature Range 0°C to +70°C 0°C to +70°C 0°C to +70°C TYPICAL OPERATING CIRCUIT LOW BATTERY CONTINUITY V+ 5 pF 20 19 18 17 16 15 14 13 ...


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