TI Creates Industry's Widest Bandwidth 24-Bit Industrial ADC

11/15/2004 - Providing a breakthrough combination of DC accuracy and AC performance, Texas Instruments Incorporated (TI) (NYSE: TXN) announced the industry´s widest bandwidth 24-bit industrial analog-to-digital converter (ADC). The ADS1271 offers 50kHz bandwidth, 1.8uV/C offset drift and up to 109dB signal-to-noise ratio (SNR), enabling a new level of precision measurements in industrial, medical and automotive applications. (See www.ti.com/sc04230.)

Traditionally, industrial delta-sigma ADCs offering good drift performance used digital filters with large passband droop, resulting in limited signal bandwidth mostly suited for DC measurements. High-resolution ADCs for audio applications offer larger usable bandwidths, but the offset and drift specifications are significantly worse (and often unspecified) than their industrial counterparts. The ADS1271 combines these two converter types, allowing high-precision measurements with excellent DC and AC specifications ensured over a -40C to +105C temperature range.

"Texas Instruments has utilized its expertise in precision industrial and high-performance audio data conversion to develop a new class of data converters with unmatched precision and speed," said Gregg Lowe, senior vice president of TI's high-performance analog business. "This breakthrough data converter provides our customers with the best of both worlds, allowing them to achieve uncompromised performance in their applications."

Utilizing proprietary design techniques, the high-order, chopper-stabilized modulator achieves very low drift (less than 1.8uV/C) with low in-band noise (6.5uV rms). The onboard linear phase decimation filter suppresses modulator and signal out-of-band noise, providing a signal pass-band of 90% of the Nyquist rate with less than 0.005dB of ripple.

Three selectable operating modes allow for optimization of speed (105kSPS data rate), resolution (109dB SNR) and power dissipation (35mW). A selectable frame-sync or SPI serial interface provides for convenient interfacing to DSPs and microcontrollers. All operations, including internal offset calibration, are controlled directly by pins - there are no registers to program.

The ADS1271 is optimized to work with TI´s high-performance TMS320TM DSP platforms. TI also has a range of amplifiers, such as the OPA2227 and OPA1632, which are well suited to work with the ADS1271 to achieve highest performance.

Availability and Packaging
The ADS1271 is sampling now, with volume production scheduled for 4Q 2004. The device comes in a TSSOP-16 package and is priced at $5.90 in 1,000 piece quantities (suggested resale pricing). Evaluation modules (EVMs) are also available.

TI offers analog engineers a wide-ranging support infrastructure that includes training and seminars, design tools and utilities, technical documentation, evaluation modules, an online KnowledgeBase, a product information hotline and a comprehensive offering of samples that ship within 24 hours of request. For more information on TI´s complete analog design support, and to download the latest Data Converter Selection Guide, visit www.ti.com/analog.

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