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TI ADC offers 50kHz bandwidth

Posted: 15 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? ti? analog-to-digital converter? adc? ads1271?

Texas Instruments Inc. (TI) has introduced what it claims as the industry's widest bandwidth 24bit industrial analog-to-digital converter (ADC).

The ADS1271 offers 50kHz bandwidth, 1.8?V/C offset drift and up to 109dB signal-to-noise ratio (SNR). According to TI, this enables a new level of precision measurements in industrial, medical and automotive applications.

Traditionally, the company explained, 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, the press release said.

"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," shared Gregg Lowe, SVP 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 low drift (<1.8?V/C) with low in-band noise (6.5?V rms). The onboard linear phase decimation filter suppresses modulator and signal out-of-band noise, providing a signal pass-band of 90 percent of the Nyquist rate with <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.

The ADS1271 is already sampling, with volume production scheduled for 4Q 2004. The device comes in a TSSOP-16 package and has a suggested resale price of $5.90 in 1,000 piece quantities. Evaluation modules are also available.




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