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TC7135 Datasheet(PDF) 1 Page - Microchip Technology |
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TC7135 Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 22 page  © 2002 Microchip Technology Inc. DS21460B-page 1 TC7135 Features • Low Rollover Error: ±1 Count Max • Nonlinearity Error: ±1 Count Max • Reading for 0V Input • True Polarity Indication at Zero for Null Detection • Multiplexed BCD Data Output • TTL-Compatible Outputs • Differential Input • Control Signals Permit Interface to UARTs and Microprocessors • Blinking Display Visually Indicates Overrange Condition • Low Input Current: 1pA • Low Zero Reading Drift: 2 µV/°C • Auto-Ranging Supported with Overrange and Underrange Signals • Available in PDIP and Surface-Mount Packages Applications • Precision Analog Signal Processor • Precision Sensor Interface • High Accuracy DC Measurements Device Selection Table General Description The TC7135 4-1/2 digit A/D converter (ADC) offers 50ppm (1 part in 20,000) resolution with a maximum nonlinearity error of 1 count. An auto zero cycle reduces zero error to below 10 µV and zero drift to 0.5 µV/°C. Source impedance errors are minimized by a 10pA maximum input current. Rollover error is limited to ±1 count. Microprocessor based measurement systems are sup- ported by BUSY, STROBE and RUN/HOLD control sig- nals. Remote data acquisition systems with data transfer via UARTs are also possible. The additional control pins and multiplexed BCD outputs make the TC7135 the ideal converter for display or microprocessor based measurement systems. Functional Block Diagram Part Number Package Temperature Range TC7135CLI 28-Pin PLCC 0 °Cto +70°C TC7135CPI 28-Pin PDIP 0 °Cto +70°C TC7135CBU 64-Pin PQFP 0 °Cto +70°C TC7135 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 100k Ω Analog GND 100 k Ω Signal Input 0.1 µF SET VREF = 1V V- REF IN ANALOG COMMON INT OUT AZ IN BUFF OUT CREF- CREF+ -INPUT +INPUT D5 (MSD) B1 (LSB) B2 V+ UNDERRANGE OVERRANGE STROBE RUN/HOLD DIGTAL GND POLARITY CLOCK IN BUSY (LSD) D1 D2 D4 (MSB) B8 B4 D3 +5V 1 µF 100k Ω 1 µF 0.47 µF VREF IN Clock Input 120kHz –5V 4-1/2 Digit A/D Converter |
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