Product category:
Analogue and Mixed Signal ICs
News Release from: Texas Instruments (April 2001-March 2006) | Subject: ADS7871
Edited by the Electronicstalk Editorial
Team on 08 May 2003
Analogue front end boasts 14bit
precision
A novel low-power data acquisition system provides complete signal conditioning and conversion for portable and battery-powered systems.
A novel low-power data acquisition system (DAS) provides complete signal conditioning and conversion for portable and battery-powered systems, low-power control systems, smart sensor applications and general-purpose instrumentation The low-priced ADS7871 offers customers system processing capability and built-in flexibility by integrating a 14bit, 48Ksample/s successive approximation (SAR) analogue-to-digital convertor, four-channel differential/eight-channel single-ended multiplexer, programmable gain amplifier (PGA), precision voltage reference, reference buffer amplifier, on-board clock generator and serial interface for control and data retrieval
This article was originally published on Electronicstalk on 8 Nov 2004 at 8.00am (UK)
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"The ADS7871 is the industry's only SAR-based data acquisition system which surpasses the 12bit resolution level.
A SAR-based DAS offers low latency at much lower power consumption compared to other competing architectures, as well as easier multichannel sweeping and inherent sample and hold.
This provides customers with a high-precision, versatile, single-chip DAS at an unequalled price", said Tony Chang, Strategic Marketing Engineer for TI's data acquisition products.
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The PGA provides high-input impedance, excellent gain accuracy, good common-mode rejection and low noise.
For many low-level signals, no external amplification or impedance buffering is needed between the signal source and the ADC input.
The offset voltage of the PGA is auto zeroed, offering excellent long term DC stability.
Gains of 1, 2, 4, 5, 8, 10, 16 and 20V/V allow signals as low as 125mV to produce full-scale digital outputs.
Power consumption is 8.5mW in normal operation and only 5mW in standby mode.
The ADS7871 contains an internal reference, which is trimmed for high initial accuracy and stability versus temperature.
Drift is typically 10ppm/degC.
An internal reference buffer amplifier is provided for use with either an internal or external reference.
An external reference can be used in situations, for example, where multiple ADS7871 devices share a common reference.
The device includes a 4bit digital I/O addressed through the serial interface, offering additional versatility for control of external multiplexers or other ancillary functions.
The serial interface provides low-cost isolation and allows the use of SPI, QSPI, Microwire and 8051-family protocols, without glue logic.
The ADS7871 is packaged in an SSOP-28, and is available now from TI and its authorised distributors.
Suggested resale pricing is $4.75 in 1000-piece quantities.
The ADS7871 is pin compatible with TI's ADS7870 12bit data acquisition system.
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