Mixed Signal/Analog

Lowest power differential ADC drivers from TI enable highest accuracy conversion

2nd February 2009
ES Admin
0

A new fully differential amplifier family from Texas Instruments drives the highest accuracy data conversion across single- and multi-channel successive approximation register (SAR) and delta-sigma analog-to-digital converters (ADCs) in a wide range of applications, including industrial, medical and audio. The THS4521, THS4522 and THS4524 provide the industry’s best performance to power ratio, making the devices well-suited for applications requiring high resolution and precision with superior dynamic range, such as pressure and flow meters, seismic equipment and electrocardiogram machines, as well as battery-operated devices and other applications with sensitive power budgets.

“Previously, customers seeking a buffer for differential precision ADCs could choose between a single-ended amplifier solution requiring complex interface circuits or a higher power fully differential amplifier,” said Art George, senior vice president of TI’s High-Performance Analog business unit.
“The THS452x provides an alternative that reduces the number of amplifiers to save board space and alleviates amplifier and circuit matching concerns while minimizing power consumption.”

The THS452x devices enable customers to drive differential ADCs, including TI’s ADS8317 16-bit, 250-kSPS SAR converter and ADS1278 24-bit, 128-kSPS delta-sigma converter, and achieve specified data sheet performance levels. For instance, using the THS4521 to buffer the ADS1278, at 10-kHz input achieves 102-dB signal-to-noise ratio (SNR) and 110-dBc spurious free dynamic range (SFDR) with very low quiescent current, which reduces system power consumption.

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