TC7109/A Data Sheet
http://www.microchip.com/stellent/images/mchpsiteimages/dwnfolder.gifTC7109/A Data SheetThe TC7109 is 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 TC7109A has features that 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 1 µV/°C, input noise typically 15 µVPP,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 enables 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 overrange recovery performance and higher output drive capability than the original TC7109.All new (or existing)designs should specify the TC7109A wherever possible.
Parameter NameValue
Input Voltage Range (V)Vss + 1.5 to Vdd - 1.5
Sampling Rate2 to 10
Programmable resolution/conversion timeNo
Input Channels1
Charge pump (-V) output pinNo
Resolution12 bits plus sign bit
Sampling Rate (Conv/sec)2 to 10
InterfaceSerial Port
Supply Voltage Min (V)4.5
Supply Voltage Max (V)5.5
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 Overrange Indication
Sign Magnitude Coding Format
True Differential Signal Input and Differential Reference Input
Low Noise ................................15mVP-P Typ.
Input Current ............................. 1pA Typ.
No Zero Adjustment Needed
TTL-Compatible, Byte-Organized Tri-State Outputs
UART Handshake Mode for Simple Serial Data Transmission
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