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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 1mV/°C, input noise typically 15mVP-P, and auto-zero. True differential input and reference allow measurement of bridge-type transducers such as load cells, strain gauges, and temperature transducers.
TC7109 Maximum Ratings
Positive Supply Voltage (GND to V+) ..................... +6.2V Negative Supply voltage (GND to V) ....................... 9V Analog Input Voltage (Low to High) (Note 1) ....... V+ to V Reference Input Voltage (Low to High (Note 1) .. V+ to V Digital Input Voltage (Pins 227) (Note 2) .. GND 0.3V Power Dissipation, TA < 70°C, (Note 3) CerDIP .................................................................. 2.29W Plastic DIP ............................................................. 1.23W PLCC ...................................................................... 1.23W PQFP ...................................................................... 1.00W Operating Temperature Range Plastic Package (C) ....................................0°C to +70°C Ceramic Package (I) ........................... 25°C to +85°C (M) ................... 55°C to +125°C Storage Temperature Range .......... ... 65°C to +150°C Lead Temperature (Soldering, 10 sec) ................ +300°C
TC7109 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 mVP-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
TC7109 Connection Diagram
TC7109A 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 1mV/°C, input noise typically 15mVP-P, and auto-zero. True differential input and reference allow measurement of bridge-type transducers such as load cells, strain gauges, and temperature transducers.
TC7109A Maximum Ratings
Positive Supply Voltage (GND to V+) ..................... +6.2V Negative Supply voltage (GND to V) ....................... 9V Analog Input Voltage (Low to High) (Note 1) ....... V+ to V Reference Input Voltage (Low to High (Note 1) .. V+ to V Digital Input Voltage (Pins 227) (Note 2) .. GND 0.3V Power Dissipation, TA < 70°C, (Note 3) CerDIP .................................................................. 2.29W Plastic DIP ............................................................. 1.23W PLCC ...................................................................... 1.23W PQFP ...................................................................... 1.00W Operating Temperature Range Plastic Package (C) ....................................0°C to +70°C Ceramic Package (I) ........................... 25°C to +85°C (M) ................... 55°C to +125°C Storage Temperature Range .......... ... 65°C to +150°C Lead Temperature (Soldering, 10 sec) ................ +300°C
TC7109A 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 mVP-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