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TC7126 Datasheet(PDF) 1 Page - Microchip Technology |
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TC7126 Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 22 page  © 2002 Microchip Technology Inc. DS21458B-page 1 TC7126/A Features • Internal Reference with Low Temperature Drift - TC7126: 80ppm/°C Typical - TC7126A: 35ppm/°C Typical • Zero Reading with Zero Input • Low Noise: 15µVP-P • High Resolution: 0.05% • Low Input Leakage Current: 1pA Typ., 10pA Max. • Precision Null Detectors with True Polarity at Zero • High-Impedance Differential Input • Convenient 9V Battery Operation with Low Power Dissipation: 500 µWTyp., 900µWMax. Applications • Thermometry • Bridge Readouts: Strain Gauges, Load Cells, Null Detectors • Digital Meters and Panel Meters: - Voltage/Current/Ohms/Power, pH • Digital Scales, Process Monitors Device Selection Table General Description The TC7126A is a 3-1/2 digit CMOS analog-to-digital converter (ADC) containing all the active components necessary to construct a 0.05% resolution measure- ment system. Seven-segment decoders, digit and polarity drivers, voltage reference, and clock circuit are integrated on-chip. The TC7126A directly drives a liq- uid crystal display (LCD), and includes a backplane driver. A low cost, high resolution indicating meter requires only a display, four resistors, and four capacitors. The TC7126A's extremely low power drain and 9V battery operation make it ideal for portable applications. The TC7126A reduces linearity error to less than 1 count. Rollover error (the difference in readings for equal magnitude, but opposite polarity input signals) is below ±1 count. High-impedance differential inputs offer 1pA leakage current and a 1012 Ω input imped- ance. The 15 µVP-P noise performance ensures a "rock solid" reading, and the auto-zero cycle ensures a zero display reading with a 0V input. The TC7126A features a precision, low drift internal voltage reference and is functionally identical to the TC7126. A low drift external reference is not normally required with the TC7126A. Package Code Package Temperature Range CPL 40-Pin PDIP 0 °Cto +70°C IPL 40-Pin PDIP (TC7126 Only) -25 °Cto +85°C CKW 44-Pin PQFP 0 °Cto +70°C CLW 44-Pin PLCC 0 °Cto +70°C 3-1/2 Digit Analog-to-Digital Converters |
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