Product category: Analogue and Mixed Signal ICs
News Release from: Texas Instruments (April 2001-March 2006) | Subject: Convertor boasts a bigger bandwidth
Edited by the Electronicstalk Editorial Team on 11 November 2004
Convertor boasts a bigger bandwidth
The ADS1271 is billed as the industry's widest bandwidth 24bit industrial ADC
Providing a breakthrough combination of DC accuracy and AC performance, Texas Instruments has unveiled the industry's widest bandwidth 24bit industrial analogue-to-digital convertor (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.
This article was originally published on Electronicstalk on 11 November 2004 at 8.00am (UK)
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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 convertor types, allowing high-precision measurements with excellent DC and AC specifications ensured over a -40 to +105C temperature range.
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'Texas Instruments has utilised its expertise in precision industrial and high-performance audio data conversion to develop a new class of data convertors with unmatched precision and speed”, said Gregg Lowe, Senior Vice President of TI’s High-Performance Analog Business.
'This breakthrough data convertor provides our customers with the best of both worlds, allowing them to achieve uncompromised performance in their applications”.
Using proprietary design techniques, the high-order, chopper-stabilised 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 optimisation of speed (105Ksample/s datarate), 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 optimised to work with TIs high-performance TMS320 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.
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 1000 piece quantities (suggested resale pricing).
Evaluation modules (EVMs) are also available.
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