ADS1281
用于地震监测和能源勘探的超高分辨率 Σ-Δ ADC
The 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.
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- High Resolution:
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- 130dB SNR 250SPS
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- 127dB SNR 500SPS
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- High Accuracy:
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- THD: –122dB typ, –115dB max
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- INL: 0.6ppm
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- Inherently Stable Modulator with Fast Responding Over-Range Detection
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- Flexible Digital Filter:
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- Sinc + FIR + IIR Selectable
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- Linear or Minimum Phase Response
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- Programmable High-Pass Filter
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- Selectable FIR Data Rates:
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- 250SPS to 4kSPS
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- Filter Bypass Option
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- Low Power Consumption:
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- Operating: 12mW
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- Shutdown: 10µW
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- Calibration Engine for Offset and
Gain Correction
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- SYNC Input
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- Analog Supply:
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- Unipolar +5V or Bipolar ±2.5V
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- Digital Supply: 1.8V to 3.3V
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- APPLICA ONS
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- Energy Exploration
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- Seismic Monitoring
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- High-Accuracy Instrumentation
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