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TC7136CLW Scheda tecnica(PDF) 1 Page - Microchip Technology |
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TC7136CLW Scheda tecnica(HTML) 1 Page - Microchip Technology |
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1 / 22 page  © 2002 Microchip Technology Inc. DS21461B-page 1 TC7136/TC7136A Features • Fast Over Range Recovery, Ensured First Reading Accuracy • Low Temperature Drift Internal Reference - TC7136: 70ppm/°C (Typ.) - TC7136A: 35ppm/°C (Typ.) • Zero Reading with Zero Input • Low Noise: 15 µVP-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 µW (Typ.)/900µW(Max.) Applications • Thermometry • Bridge Readouts: Strain Gauges, Load Cells, Null Detectors • Digital Meters: Voltage/Current/Ohms/Power, pH • Digital Scales, Process Monitors • Portable Instrumentation Device Selection Table General Description The TC7136 and TC7136A are low power, 3-1/2 digit with liquid crystal display (LCD) drivers and analog-to- digital converters. These devices incorporate an "inte- grator output zero" phase, which enables over range recovery. The performance of existing TC7126, TC7126A and ICL7126 based systems may be upgraded with minor changes to external, passive components. The TC7136A has an improved internal zener refer- ence voltage circuit which maintains the analog com- mon temperature drift to 35ppm/°C (typical) and 75ppm/°C (maximum). This represents an improve- ment of two to four times over similar 3-1/2 digit con- verters. The costly, space consuming external reference source may be removed. The TC7136 and TC7136A limit linearity error to less than 1 count on 200mV or 2V full scale ranges. The roll- over error (the difference in readings for equal magni- tude, but opposite polarity input signals) is below ±1 count. High-impedance differential inputs offer 1pA leakage currents and a 1012 Ω input impedance. The differential reference input allows ratiometric measure- ments for ohms or bridge transducer measurements. The 15 µVP-P noise performance ensures a "rock solid" reading. The auto-zero cycle enables a zero display readout for a 0V input. Part Number Package Temperature Range TC7136 CPI 40-Pin PDIP 0 °Cto +70°C TC7136 CKW 44-Pin PQFP 0 °Cto +70°C TC7136 CLW 44-Pin PLCC 0 °Cto +70°C TC7136A CPI 40-Pin PDIP 0 °Cto +70°C TC7136A CKW 44-Pin PQFP 0 °Cto +70°C TC7136A CLW 44-Pin PLCC 0 °Cto +70°C Low Power 3-1/2 Digit Analog-to-Digital Converter |
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