ADS1281IPW Data Acquisition - Analog to Digital Converters (ADC) by Texas Instruments

Description
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 (O2) modulator that provides outstanding noise and linearity performance. 1
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 corer 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.  
Features
• 100SPS Data Rate (High-Speed Mode)
• Single-Cycle Settling
• Easy Conversion Control with START Pin
• Automatic Shutdown
• Low Noise: 4µVRMS Noise (High-Resolution Mode)
• Input Multiplexer with Two Differential Channels (ADS1226)
• Voltage Reference Supports Ratiometric Measurements
• Self-Calibrating
• Simple Read-Only 2-Wire Serial Interface
• Internal High-Impedance Input Buffer
• Internal Temperature Sensor
• Internal Oscillator
• Low-Power: 1mW While Operating, < 1µA During Shutdown
• Analog and Digital Supplies: 2.7V to 5.5V   Applications
• Energy Exploration
• Seismic Monitoring
• High-Accuracy Instrumentation