ADS1281 Ultra-high-resolution 4-kSPS 1-channel delta-sigma ADC for seismic and energy exploration | TI.com

ADS1281 (ACTIVE) Ultra-high-resolution 4-kSPS 1-channel delta-sigma ADC for seismic and energy exploration

Ultra-high-resolution 4-kSPS 1-channel delta-sigma ADC for seismic and energy exploration - ADS1281
Datasheet
 

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 () 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.

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: 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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Parametrics

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Part number Order Resolution (Bits) Sample rate (Max) (kSPS) Number of input channels Interface Operating temperature range (C) Package Group Approx. price (US$) Power consumption (Typ) (mW) Package size: mm2:W x L (PKG) Architecture Input type Multi-channel configuration Reference mode Features Input range (Max) (V) Input range (Min) (V) Analog voltage AVDD (Min) (V) Analog voltage AVDD (Max) (V) Digital supply (Min) (V) Digital supply (Max) (V) SNR (dB) THD (Typ) (dB) Rating
ADS1281 Order now 31     4     1     SPI     -40 to 85     TSSOP | 24     31.63 | 1ku     12     24TSSOP: 34 mm2: 4.4 x 7.8 (TSSOP | 24)     Delta-Sigma     Differential         Ext         2.5     2.5     -2.5
0    
2.5
5    
1.65     3.6     130     -122     Catalog    
ADS1282 Samples not available 31     4     2     SPI     -40 to 85     TSSOP | 28     34.50 | 1ku     25     28TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 28)     Delta-Sigma     Differential     Multiplexed     Ext     PGA     2.5     0.039     -2.5
0    
2.5
5    
1.65     3.6     130     -122     Catalog    
ADS1283 Samples not available 31     4     2     SPI     -40 to 85     VQFN | 24     35.50 | 1ku     18     24VQFN: 20 mm2: 4 x 5 (VQFN | 24)     Delta-Sigma     Differential     Multiplexed     Ext     PGA     2.5     0.039     -2.5
0    
2.5
5    
1.65     3.6     130     -122     Catalog    
ADS1287 Samples not available 24     1     1     SPI     -40 to 85     VQFN | 24       4.5     24VQFN: 20 mm2: 4 x 5 (VQFN | 24)     Delta-Sigma     Differential         Ext     PGA     2.5