Date: 02/02/2009

ADC drivers for applications of high resolution and precision

The new ADC drivers THS4521, THS4522 and THS4524 from Texas Instruments are made for high resolution and precision applications 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."


Key features and specifications are,

1. Consumes less quiescent current of 1.14 mA/channel and very low power down current of 20 uA. TI says its best among its competing devices.
2. Increased bandwidth by providing 145-MHz and 490-V/us slew rate to buffer and amplify signals
3. Input voltage noise of 4.6nV/rtHz to minimize distortion
4. Provides a high-performance buffer for TI's SAR and delta-sigma ADCs for high-accuracy and lowpower systems
5. 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
6. Offers power supply flexibility by accepting single supply of +3 V to +5 V or dual supply of +/-1.5 V to +/- 2.5 V
7. Available in single-, dual- and quad- configuration options
8. Driving SAR and delta-sigma converters for high accuracy up to 24 bits

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.

Availability: Now

Price:
THS4521: $1.10
THS4522: $1.85
THS4524: $3.15

Package:
THS4521: MSOP, SOIC
THS4522: TSSOP
THS4524: TSSOP

For details visit www.ti.com/adcdrivers