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GENERAL DESCRIPTION

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.

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 1μV/°C, input noise typically 15μVP-P, and auto-zero. True differential input and reference allow measurement of bridge-type transducers such as load cells, strain gauges, and temperature transducers.

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 ............................................ 15 μVP-P Typ

■ Input Current .............................................. 1 pA Typ

■ No Zero Adjustment Needed

■ TTL-Compatible, Byte-Organized Tri-State Outputs

■ UART Handshake Mode for Simple Serial Data Transmission