The ADS1281 is an extremely high-performance, single-chip analog-to-digital converter (ADC) designed for the demanding needs of energy exploration and seismic monitoring environments. The single-chip design promotes board area savings for improvements in high-density applications.
  The converter uses a fourth-order, inherently stable, delta-sigma () modulator that provides outstanding noise and linearity performance. The modulator is used either in conjunction with the on-chip digital filter, or can be bypassed for use with post-processing filters.
  The digital filter consists of sinc and finite impulse response (FIR) low-pass stages followed by an infinite impulse response (IIR) high-pass filter (HPF) stage. Selectable decimation provides data rates from 250 to 4000 samples per second (SPS). The FIR low-pass stage provides both linear and minimum phase response. The HPF features an adjustable corner frequency. On-chip gain and offset scaling registers support system calibration.
  The synchronization input (SYNC) can be used to synchronize the conversions of multiple ADS1281s. The SYNC input also accepts a clock input for continuous alignment of conversions from an external source.
  Together, the modulator and filter dissipate only 12mW. The ADS1281 is available in a compact TSSOP-24 package and is fully specified from –40°C to +85°C, with a maximum operating range to +125°C.

  High Resolution: 
  -130dB SNR (250SPS)
  -127dB SNR (500SPS)
  High Accuracy: 
  -THD: –122dB (typ), –115dB (max)
  -INL: 0.6ppm
  Inherently Stable Modulator with Fast Responding Over-Range Detection
  Flexible Digital Filter: 
  -Sinc + FIR + IIR (Selectable)
  -Linear or Minimum Phase Response
  -Programmable High-Pass Filter
  -Selectable FIR Data Rates: 
  -250SPS to 4kSPS
  Filter Bypass Option
  Low Power Consumption: 
  -Operating: 12mW
  -Shutdown: 10µW
  Calibration Engine for Offset and 
  Gain Correction
  SYNC Input
  Analog Supply: 
  -Unipolar (+5V) or Bipolar (±2.5V)
  Digital Supply: 1.8V to 3.3V
  APPLICATIONS 
  -Energy Exploration
  -Seismic Monitoring
  -High-Accuracy Instrumentation
  All other trademarks are the property of their respective ownersHigh Resolution: 
  -130dB SNR (250SPS)
  -127dB SNR (500SPS)
  High Accuracy: 
  -THD: –122dB (typ), –115dB (max)
  -INL: 0.6ppm
  Inherently Stable Modulator with Fast Responding Over-Range Detection
  Flexible Digital Filter: 
  -Sinc + FIR + IIR (Selectable)
  -Linear or Minimum Phase Response
  -Programmable High-Pass Filter
  -Selectable FIR Data Rates: 
  -250SPS to 4kSPS
  Filter Bypass Option
  Low Power Consumption: 
  -Operating: 12mW
  -Shutdown: 10µW
  Calibration Engine for Offset and 
  Gain Correction
  SYNC Input
  Analog Supply: 
  -Unipolar (+5V) or Bipolar (±2.5V)
  Digital Supply: 1.8V to 3.3V
  APPLICATIONS 
  -Energy Exploration
  -Seismic Monitoring
  -High-Accuracy Instrumentation
  All other trademarks are the property of their respective owners