描述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.特性105kSPS Data Rate AC Performance: 51kHz Bandwidth 109dB SNR (High-Resolution Mode) –108dB THD DC Accuracy: 1.8µV/°C Offset Drift 2ppm/°C Gain Drift Selectable Operating Modes: High-Speed: 105kSPS Data Rate High-Resolution: 109dB SNR Low-Power: 35mW Dissipation Power-Down Control Digital Filter: Linear Phase Response Passband Ripple: ±0.005dB Stop Band Attenuation: 100dB Internal Offset Calibration On Command Selectable SPI&™ or Frame Sync Serial Interface Designed for Multichannel Systems: Daisy-Chainable Serial Interface Easy Synchronization Simple Pin-Driven Control Modulator Output Option Specified from –40°C to +105°C Analog Supply: 5V Digital Supply: 1.8V to 3.3V APPLICATIONS Vibration/Modal Analysis Acoustics Dynamic Strain Gauges Pressure Sensors Test and MeasurementSPI is a trademark of Motorola Inc. All other trademarks are the property of their respective owners.