Texas Instruments Inc. (Dallas, Texas) claims that its latest family of 16-bit analog-to-digital converters (ADCs) is 70 percent smaller than its nearest competition. The ADS1115 family – supplied in a 2.0 x 1.5 x 0.4 mm QFN package – has been largely designed to suit portable industrial and consumer systems.
Offering programmable data rates up to 860 samples per second (SPS), the ADS1115 family particularly suits applications such as portable instrumentation, industrial process control, smart transmitters and medical instrumentation. Despite integrating an oscillator, low-drift reference, programmable gain amplifier, comparator and four-channel input multiplexer, the device consumes just 150 µA (typical) of supply current and operates down to 2V. Operating in either continuous conversion or single-shot mode, the ADS1115 family's potentially tiny current consumption is down to its ability to automatically power down after a conversion, greatly reducing current use during idle periods.
“Analog customers require ever higher functionality and performance without sacrificing system size and power in order to take their products to the next level,” said Art George, senior vice president of TI's High-Performance Analog business unit. “By reducing size by 70 percent and delivering a complete family of integration and resolution options, the ADS1115 will help designers achieve a smaller system footprint, lower power, higher performance and easy design implementation.”
Data transfer for this device is via an I2C-compatible serial interface; with four I2C slave addresses available for selection. The ADS1113 family, which is already shipping, includes a 12-bit version to provide increased flexibility.