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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