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 1 µV/°C, input noise typically 15 µVp-p, and auto-zero. True differential input and reference allow measurement of bridge-type transducers such as load cells, strain gauges, and temperature transducers. In the handshake mode, the TC7109A will operate with industry-standard UARTs in controlling serial data transmission - ideal for remote data logging. The TC7109A has improved overrange recovery performance and higher output drive capability than the TC7109.

• 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
• True Differential Signal Input and Differential Reference Input
• Low Noise: 15µVp-p Typ.
• Input Current: 1pA Typ.
• No Zero Adjustment Needed
• UART Handshake Mode for Simple Serial Data Transmission