Dallas – Texas Instruments Inc. introduced the industry's highest-performance analog-to-digital converters for industrial applications from the company's Burr-Brown product line. Featuring a best-in-class combination of noise-free resolution, data rate and functionality, these 24-bit delta-sigma A/Ds provide designers with complete, high-resolution measurement solutions for the most demanding industrial applications, including scientific instrumentation, process control, medical equipment and weighing scales.
“When talking with instrumentation designers, we identified the need for a converter that offers high conversion rates while preserving the effective resolution of low-speed designs in order to enhance overall system performance. Designed to meet this demand, the ADS1255 and ADS1256 offer an unmatched combination of noise performance, speed and features that allows users to reach new levels of measurement accuracy with extended bandwidth,” said Rich Wegner, strategic-marketing manager for TI's oversampling data converter products.
The ADS1255 and ADS1256 offer noise-free resolution up to 23 bits, data rates up to 30k samples per second, plus/minus 0.0010 percent nonlinearity (max) and a host of on-board peripherals (input multiplexer, input buffer, programmable-gain amplifier).
Both converters comprise a fourth-order, delta-sigma modulator followed by a programmable digital filter. The flexible input multiplexer handles differential or single-ended signals and includes circuitry to verify the integrity of the external sensor connected to the inputs. The input also includes a chopper-stabilized buffer providing very high-input impedance and a low-noise PGA with gains of 1 to 64. The programmable filter allows the user to optimize between resolution and data rate.
The ADS1255 supports one differential or two single-ended inputs and has two general-purpose digital I/Os. The ADS1256 supports four differential or eight single-ended inputs and has four general-purpose digital I/Os. Communication is handled over an SPI-compatible serial interface.
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