TC7109/A
12-Bit пЃA-Compatible Analog-to-Digital Converters
Features: General Description: 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: 15пЃVP-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 TC7109A 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. Device Selection Table
Part Number
(TC7109X)* Package Temperature
Range TC7109CKW 44-Pin PQFP 0В°C to +70В°C TC7109CLW 44-Pin PLCC 0В°C to +70В°C TC7109CPL
TC7109IJL 40-Pin PDIP 0°C to +70°C 40-Pin CERDIP -25°C to +85°C *The “A” version has a higher IOUT on the digital lines.  2002-2012 Microchip Technology Inc. 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 1пЃV/В°C, input noise typically
15пЃVP-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 …