Details, datasheet, quote on part number: TC7109
PartTC7109
CategoryData Conversion => ADC (Analog to Digital Converters) => Dual Slope A/D
TitleDual Slope A/D
DescriptionThe TC7109A is a 12-bit Plus Sign,cmos Low-power Analog-to-digital Converter (ADC)
CompanyMicrochip Technology, Inc.
DatasheetDownload TC7109 datasheet
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Features, Applications
Features

Zero Integrator Cycle for Fast Recovery from Input Overloads Eliminates Cross-Talk in Multiplexed Systems 12-Bit Plus Sign Integrating A/D Converter with Over Range Indication Sign Magnitude Coding Format True Differential Signal Input and Differential Reference Input Low Noise: 15VP-P Typ. Input Current: 1pA Typ. No Zero Adjustment needed TTL Compatible, Byte Organized Tri-State Outputs UART Handshake Mode for simple Serial Data Transmissions

The a 12-bit plus sign, CMOS low power analog-to-digital converter (ADC). Only eight passive components and a crystal are required to form a complete dual slope integrating ADC. The improved VOH source current and other TC7109A features make it an attractive per-channel alternative to analog multiplexing for many data acquisition applications. These features include typical input bias current of 1pA, drift of less than 1V/C, input noise typically 15VP-P, and auto-zero. True differential input and reference allow measurement of bridge type transducers, such as load cells, strain gauges, and temperature transducers. The TC7109A provides a versatile digital interface. In the Direct mode, chip select and HIGH/LOW byte enable control parallel bus interface. In the Handshake mode, the TC7109A will operate with industry standard UARTs in controlling serial data transmission ideal for remote data logging. Control and monitoring of conversion timing is provided by the RUN/HOLD input and STATUS output. For applications requiring more resolution, see the TC500, 15-bit plus sign ADC data sheet. The TC7109A has improved over range recovery performance and higher output drive capability than the original TC7109. All new (or existing) designs should specify the TC7109A wherever possible.

Part Number TC7109CPL TC7109IJL Package 44-Pin PQFP 44-Pin PLCC 40-Pin PDIP 40-Pin CERDIP Temperature Range to +85C

*The "A" version has a higher IOUT on the digital lines.

33 COMMON 32 INT AZ 30 BUFF 29 REF OUT 28 V27 SEND 26 RUN/HOLD 25 BUFF OSC OUT 24 OSC SEL 23 OSC OUT 22 OSC IN 21 MODE

REF CAP+ IN+ 36 C REF High Order Byte Inputs Low Order Byte Inputs
Comparator Comp Out 14 Latches 12-Bit Counter Latch Clock Comp Out AZ INT DE ZI
16 Three-State Outputs Oscillator and Clock Circuitry Handshake Logic 26 RUN/ HOLD Send

 

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