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TC7129CKW Datasheet(PDF) 1 Page - Microchip Technology |
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TC7129CKW Datasheet(HTML) 1 Page - Microchip Technology |
1 / 28 page 2002-2012 Microchip Technology Inc. DS21459E-page 1 TC7129 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 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 specifi- cally for high-resolution, battery-powered digital multi- meter applications. The traditional dual-slope method of A/D conversion has been enhanced with a succes- sive integration technique to produce readings accu- rate 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 condi- tion. 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 read- ings, 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. Typical Application Package Code Pin Layout Package Temperature Range TC7129CPL Normal 40-Pin PDIP 0 C to +70C TC7129CKW Formed 44-Pin PQFP 0 C to +70C TC7129CLW – 44-Pin PLCC 0 C to +70C TC7129 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 9V + + Low Battery Continuity V+ 5 pF 120 kHz 10 pF 0.1 µF 20 k Ω 0.1 µF 100 k Ω 1 µF 0.1 µF 150 k Ω 10 k Ω V+ VIN – + * *N ote: RC network between pins 26 and 28 is not required. 330 k Ω 4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers |
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