Product category:
Analogue and Mixed Signal ICs
News Release from: Texas Instruments (April 2001-March 2006) | Subject: ADS7891 and ADS7890
Edited by the Electronicstalk Editorial
Team on 15 March 2004
SAR convertors improve dynamic
performance
A new pair of high-speed 14bit successive approximation ADCs are ideal for advanced signal processing applications which require high speed, high precision and low power.
A new pair of high-speed 14bit successive approximation ADCs are ideal for advanced signal processing applications which require high speed, high precision and low power, such as optical networking, portable medical systems, spectrum analysers, data acquisition, imaging and telecommunications The ADS7891 offers true 14bit no missing code performance at 3Msample/s with only 85mW power consumption
This article was originally published on Electronicstalk on 8 Nov 2004 at 8.00am (UK)
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Key features include 78dB signal-to-noise ratio (SNR), -88dB total harmonic distortion (THD), 1.5LSB linearity, 1.5mV offset and a 14bit parallel interface with an additional byte mode that provides easy interface to 8bit processors.
The ADS7890 is a 14bit, 1.25Msample/s ADC with an SPIT compatible serial interface.
The ADS7890 features 45mW power dissipation, 77.5dB SNR, -95dB THD, 1.5LSB linearity and 1.5mV offset.
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"The ADS7891 offers the industry's best dynamic performance while matching the highest sampling rate of 3Msample/s for 14bit SAR ADCs.
The ADS7890 features the best dynamic performance in a serial, 14bit SAR ADC with 1.25Msample/s operation, thus providing excellent performance with a minimised interface", said Tony Chang, Strategic Marketing Engineer for TI's data acquisition products.
"Furthermore, the ADS7891 and ADS7890 successfully enhance TI's industry-leading family of pin-compatible, high-speed SAR ADCs, giving customers comprehensive upgrade paths from 1.25 to 4Msample/s and from 12 to 18bit resolution".
In comparison to other convertor architectures, SAR-based ADCs have the advantage of no latency conversion, which is ideal for multiplexed or servo-control applications.
Additionally, the DC performance of these devices, especially offset and offset drift, is exceptional compared to other convertor types operating at these conversion rates.
The ADS7891 and ADS7890 offer designers a complete solution by integrating an internal reference and reference buffer.
The devices have a pseudo-differential, unipolar input range (0 to 2.5V) common to many high-speed ADCs.
A nap mode reduces power dissipation to 10mW and a power down mode consumes only 10uW.
Both devices are optimised to work with TI's high-performance amplifiers to achieve high-performance designs.
The THS4031 and THS4211 are ideal input signal conditioning and drive amplifiers.
The ADS7891 and ADS7890 are packaged in 48-lead TQFPs, and are available now from TI and its authorised distributors.
Both devices are priced from $10.50 in 1000-piece quantities (suggested resale price).
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