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TC7129 Datasheet(PDF) 1 Page - Microchip Technology |
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TC7129 Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 24 page  © 2002 Microchip Technology Inc. DS21459B-page 1 TC7129 Features • Count Resolution: ±19,999 • Resolution on 200mV Scale: 10 µV • True Differential Input and Reference • Low Power Consumption: 500 µAat 9V • Direct LCD Driver for 4-1/2 Digits, Decimal Points, Low Battery Indicator, and Continuity Indicator • Over Range and Under Range Outputs • Range Select Input: 10:1 • High Common Mode Rejection Ratio: 110dB • 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 µV 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. Over range and under range outputs and 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 °Cto +70°C TC7129CKW Formed 44-Pin PQFP 0 °Cto +70°C TC7129CLW – 44-Pin PLCC 0 °Cto +70°C 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+ 5pF 120kHz 10pF 0.1 µF 20 k Ω 0.1 µF 100k Ω 1 µF 0.1 µF 150k Ω 10k Ω V+ VIN – + * *Note: RC network between Pins 26 and 28 is not required. 330k Ω 4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers |
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