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ADC drivers claim highest accuracy conversion

Posted: 04 Feb 2009 ?? ?Print Version ?Bookmark and Share

Keywords:amplifier? ADC driver? board space saving?


Texas Instruments Inc. has released a new fully differential amplifier family, which is claimed to drive the highest accuracy data conversion across single- and multi-channel successive approximation register (SAR) and delta-sigma ADCs in a wide range of applications, including industrial, medical and audio.

The THS4521, THS4522 and THS4524 provide high 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.

The devices consume half the quiescent current (1.14mA/channel) and 22x less power down current (20?A) compared to competition. The amplifiers also increase bandwidth by greater than 30 percent, providing 145MHz and 490V/?s slew rate to buffer and amplify signals without increasing system power consumption. In addition, the family improves dynamic range/sensitivity by 44 percent with an input voltage noise of only 4.6nV/rtHz to minimize distortion.

An output common mode control allows for easy DC coupling, while negative rail input and rail-to-rail output capability simplifies design and shortens development time. Also, the devices offer power supply flexibility by accepting single supply of +3V to +5V or dual supply of 1.5V to 2.5V. Furthermore, the THS452x devices reduce board space with single-, dual- and quad- configuration options.

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

"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 VP 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."

All members of the THS452x family are available today. The THS4521 is available in MSOP, SOIC package for $1.10. Both the THS4522 and THS4524 are available in TSSOP package and priced at $1.85 and $3.15, respectively.

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