ADS1271IBPW ,24-Bit, 105kSPS Industrial Delta-Sigma ADC 16-TSSOP -40 to 105SBAS306F − NOVEMBER 2004 − REVISED OCTOBER 2007
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ADS1271IBPW-ADS1271IBPWG4-ADS1271IPW-ADS1271IPWG4-ADS1271IPWR
24-Bit, 105kSPS Industrial Delta-Sigma ADC 16-TSSOP -40 to 105
SBAS306F − NOVEMBER 2004 − REVISED OCTOBER 2007
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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
DESCRIPTIONThe 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.
VREFP VREFN AVDD DVDD
DRDY/FSYNC
SCLK
DOUT
DIN
FORMAT
AINP
AINN
DGNDAGND
SYNC/PDWN
MODE
CLK
