TC7109A

1 TC7109 TC7109A 12-BIT µP-COMPATIBLE ANALOG-TO-DIGITAL CONVERTERS FEATURES s Zero-Integrator Cycle for Fast Recovery From Input Overloads s Eliminates Cross -Talk in Multiplexed Systems s 12-Bit Plus Sign Integrating A/D Converter With Overrange Indication s Sign Magnitude Coding Format s True Differential Signal Input and Differential Reference Input s Low Noise ............................................ 15 µVP-P Typ s Input Current .............................................. 1 pA Typ s No Zero Adjustment Needed s TTL-Compatible, Byte-Organized Tri-State Outputs s UART Handshake Mode for Simple Serial Data Transmission ORDERING INFORMATION PART CODE A or blank* TC7109X Package Code Package Temperature Range CKW 44-Pin PQFP 0°C to +70°C CLW 44-Pin PLCC 0°C to +70°C CPL 40-Pin Plastic DIP 0°C to +70°C IJL 40-Pin CerDIP –25°C to +85°C * The "A" version has a higher IOUT on the digital lines. 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 bridg...