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ADS1271IPW Datasheet(PDF) 1 Page - Texas Instruments |
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ADS1271IPW Datasheet(HTML) 1 Page - Texas Instruments |
1 / 38 page SBAS306F − NOVEMBER 2004 − REVISED OCTOBER 2007 24Bit, Wide Bandwidth AnalogtoDigital Converter ADS1271 FEATURES D 105kSPS Data Rate D AC Performance: 51kHz Bandwidth 109dB SNR (High-Resolution Mode) −108dB THD D DC Accuracy: 1.8 µV/°C Offset Drift 2ppm/ °C Gain Drift D Selectable Operating Modes: High-Speed: 105kSPS Data Rate High-Resolution: 109dB SNR Low-Power: 35mW Dissipation D Power-Down Control D Digital Filter: Linear Phase Response Passband Ripple: ±0.005dB Stop Band Attenuation: 100dB D Internal Offset Calibration On Command D Selectable SPIt or Frame Sync Serial Interface D Designed for Multichannel Systems: Daisy-Chainable Serial Interface Easy Synchronization D Simple Pin-Driven Control D Modulator Output Option D Specified from −40°C to +105°C D Analog Supply: 5V D Digital Supply: 1.8V to 3.3V APPLICATIONS D Vibration/Modal Analysis D Acoustics D Dynamic Strain Gauges D Pressure Sensors D Test and Measurement DESCRIPTION The ADS1271 is a 24-bit, delta-sigma analog-to-digital converter (ADC) with a data rate up to 105kSPS. It offers a unique combination of excellent DC accuracy and outstanding AC performance. The high-order, chopper-stabilized modulator achieves very low drift with low in-band noise. The onboard decimation filter suppresses modulator and signal out-of-band noise. The ADS1271 provides a usable signal bandwidth up to 90% of the Nyquist rate with less than 0.005dB of ripple. Traditionally, industrial delta-sigma ADCs offering good drift performance use digital filters with large passband droop. As a result, they have limited signal bandwidth and are mostly suited for DC measurements. High-resolution ADCs in audio applications offer larger usable bandwidths, but the offset and drift specification are significantly weaker than their industrial counterparts. The ADS1271 combines these converters, allowing high-precision industrial measurement with excellent DC and AC specifications ensured over an extended industrial temperature range. Three operating modes allow for optimization of speed, resolution, and power. A selectable SPI or a frame-sync serial interface provides for convenient interfacing to microcontrollers or DSPs. The output from the modulator is accessible for external digital filter applications. All operations, including internal offset calibration, are controlled directly by pins; there are no registers to program. ∆Σ Modulator Digital Filter VREFP VREFN AVDD DVDD DRDY/FSYNC SCLK DOUT DIN FORMAT AINP AINN Serial Interface Control Logic DGND AGND SYNC/PDWN MODE CLK www.ti.com Copyright 2004−2007, Texas Instruments Incorporated Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. SPI is a trademark of Motorola Inc. All other trademarks are the property of their respective owners. |
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