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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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TC7135CBU 데이터시트(PDF) 1 Page - Microchip Technology |
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TC7135CBU 데이터시트(HTML) 1 Page - Microchip Technology |
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1 / 24 page  2004 Microchip Technology Inc. DS21460C-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: 1 pA • 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 General Description The TC7135 4-1/2 digit A/D Converter (ADC) offers 50 ppm (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 10 pA maximum input current. Rollover error is limited to ±1 count. Microprocessor-based measurement systems are supported by the BUSY, STROBE and RUN/HOLD control signals. Remote data acquisition systems with data transfer via UARTs are also possible. The addi- tional control pins and multiplexed BCD outputs make the TC7135 the ideal converter for display or microprocessor-based measurement systems. Functional Block Diagram 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 15 100 k 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 1µF 100 k Ω 1µF 0.47 µF VREF IN Clock Input 120 kHz 5V 4-1/2 Digit A/D Converter |
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