ADS1281IPWR

用于地震监测和能源勘探的超高分辨率 4kSPS 单通道 Δ-Σ ADC

                                            更多技术详情请登录www.mroic.cn

FEATURES

? 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: 10mW

? 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

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 (ΔΣ) 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.