TC7109 Datasheet | TelCom

1 TC7109 TC7109A 12-BIT µP-PATIBLE ANALOG-TO-DIGITAL CONVERTERS Features s s s s s s s s s s 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-patible, Byte-Organized Tri-State Outputs UART Handshake Mode for Simple Serial Data Transmission GENERAL DESCRIPTION The TC7109A is a 12-bit plus sign, CMOS low-power analog-to-digital converter (ADC). Only eight passive ponents and a crystal are required to form a plete 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. 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...