FEATURES
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 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.