ADS1281 - 用于地震监测和能源勘探的超高分辨率 Σ-Δ ADC

ADS1281是TI德州仪器公司的一款震动信号调节产品，ADS1281是用于地震监测和能源勘探的超高分辨率 Σ-Δ ADC，本站介绍了ADS1281的封装应用图解、特点和优点、功能等，并给出了与ADS1281相关的TI元器件型号供参考。

ADS1281 - 用于地震监测和能源勘探的超高分辨率 Σ-Δ ADC - 震动信号调节 - 其他传感器信号调节器 - 德州仪器

产品描述

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.

产品特性

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

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