TI's New 18-Bit A/D Converter Features 1.25 MSPS Data Rate

7/9/2003 - Extending the industry´s leading delta-sigma data converter portfolio, Texas Instruments (TI) Incorporated (NYSE: TXN) introduced the industry´s fastest 18-bit analog-to-digital converter (ADC) from the company´s Burr-Brown product line. Featuring a 1.25 mega samples per second (MSPS) data rate with outstanding high-speed performance, the ADS1625 is ideal for demanding measurement requirements in scientific instrumentation, automated test equipment, data acquisition and medical imaging.

"The unmatched combination of resolution, speed and noise performance provides instrumentation designers with a superior solution for upgrading their current and next-generation designs," said Rich Wegner, strategic marketing manager for TI's oversampling data converter products.

The ADS1625 features 93dB signal-to-noise ratio (SNR), -101dB total harmonic distortion (THD) and 103dB spurious-free dynamic range (SFDR). Input bandwidth is 615kHz (-3dB) and passband ripple is less than +/-0.0025dB (to 550kHz).

The input signal is measured against a voltage reference that can be generated on-chip or supplied externally. The digital output data is provided over a simple parallel interface that directly connects to TI´s TMS320C6000TM DSP family. An out-of-range monitor reports when the input range has been exceeded.

The device operates 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. Power dissipation is set by an external resistor and can be reduced when operating at slower speeds (150mW to 515mW). A power-down mode, activated by a digital pin, shuts down all circuitry.

The ADS1625 is pin compatible with TI's previously introduced ADS1605 (16-bit, 5MSPS ADC) to provide an easy upgrade path.

Available Today
The ADS1625 comes in a 64-lead TQFP package incorporating TI´s PowerPADTM technology, and is available now from TI and its authorized distributors. The ADS1625 is priced from $37.90 in 1,000 piece quantities (suggested resale pricing).

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