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16bit converters optimized for precision measurement apps

Posted: 11 Apr 2005 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? ti? analog-to-digital converter? adc? ads1602?

Extending its delta-sigma data converters offering, Texas Instruments Inc. (TI) introduced a pair of high-speed, high-precision analog-to-digital converters (A/D converters) for very linear high-speed operation, and demanding measurement applications in scientific instrumentation, automated test equipment, data acquisition, medical imaging and vibration analysis.

The ADS1602 modulator samples input signals with a 40MHz clock, while the digital filter decimates the modulator output by 16 to provide high-resolution 16bit output data at 2.5MS/s over a serial interface. Dynamic performance is strong all the way up to the 1.23MHz-passband transition. Total harmonic distortion (THD) is less than -101dB; spurious-free dynamic range (SFDR) is greater than 103dB, and signal-to-noise ratio (SNR) is greater than 91dB.

The ads1601 has the same advanced architecture and is intended for applications requiring less aggressive data rates and lower power dissipation. This device features 1.25MS/s data rate, 330mW power dissipation and high-speed performance: 92dB SNR, -103dB THD and 105dB SFDR. The devices are pin-compatible.

Both converters utilize oversampling topology which reduces clock jitter sensitivity during the sampling of high-frequency, large amplitude signals by a factor of four over that achieved by Nyquist-rate ADCs. A full-scale 3V differential input range makes out-of-range signals unlikely.

Power dissipation is set by an external resistor and can be reduced when operating at slower speeds. The devices operate from a 5V analog supply and a 3V digital supply. The digital I/O supply operates from 2.7V to 5.25V, enabling the digital interface to support a range of logic families. Dedicated I/O pins control all features.

Evaluation modules for both devices are available. The ADS1601 and ADS1602 are packaged in a 7-by-7mm TQFP-48 and are already available. The ADS1601 is priced at $14 in 1,000-piece quantities, while the ADS1602 is available for $23 in same quantities.

- Bettyann Liotta


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