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ADS1281IPW-ADS1281IPWR
High Resolution 24-Bit Analog-to Digital Converter
ADS1281
ADS1281
www.ti.com SBAS378D–AUGUST 2007–REVISED JUNE 2010
High-Resolution Analog-to-Digital Converter
Checkfor Samples: ADS1281
1FEATURES DESCRIPTION High Resolution: The ADS1281 is an extremely high-performance,
single-chip analog-to-digital converter (ADC)
– 130dB SNR (250SPS)designed for the demanding needs of energy
– 127dB SNR (500SPS) exploration and seismic monitoring environments.
• High Accuracy: The single-chip design promotes board area savings
THD: –122dB (typ), –115dB (max) for improvementsin high-density applications.
INL: 0.6ppm The converter usesa fourth-order, inherently stable,
delta-sigma (ΔΣ) modulator that provides outstanding
• Inherently Stable Modulator with Fastnoise and linearity performance. The modulatoris
Responding Over-Range Detection used either in conjunction with the on-chip digital
• Flexible Digital Filter: filter, or can be bypassed for use with
– Sinc+ FIR+ IIR (Selectable) post-processing filters.
Linearor Minimum Phase Response The digital filter consistsof sinc and finite impulse
– Programmable High-Pass Filter response (FIR) low-pass stages followed by an
infinite impulse response (IIR) high-pass filter (HPF)
– Selectable FIR Data Rates: stage. Selectable decimation provides data rates from
– 250SPSto 4kSPS 250to 4000 samples per second (SPS). The FIR
• Filter Bypass Option low-pass stage provides both linear and minimum
phase response. The HPF features an adjustable
• Low Power Consumption:corner frequency. On-chip gain and offset scaling
– Operating: 12mW registers support system calibration.
– Shutdown: 10mW The synchronization input (SYNC) can be usedto
• Calibration Engine for Offset and synchronize the conversionsof multiple ADS1281s.
Gain Correction The SYNC input also acceptsa clock input for
• SYNC Input continuous alignmentof conversions from an external
source.
• Analog Supply: Unipolar (+5V)or Bipolar (±2.5V) Together, the modulator and filter dissipate only
12mW. The ADS1281is available ina compact
• Digital Supply: 1.8Vto 3.3V TSSOP-24 package andis fully specified from –40°C +85°C, witha maximum operating range to +125°C.
