ADS1281 Ultra-High-Resolution, 4kSPS, 1-Ch Delta-Sigma ADC for Seismic and Energy Exploration | TI.com

ADS1281 (ACTIVE)

Ultra-High-Resolution, 4kSPS, 1-Ch Delta-Sigma ADC for Seismic and Energy Exploration

Ultra-High-Resolution, 4kSPS, 1-Ch 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 Compare all products in Precision ADCs (<=10MSPS)

 
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 ADS1282 ADS1283 ADS1287 ADS1287D
31     31     31     24     24    
4     4     4     1     1    
1     2     2     1     2    
SPI     SPI     SPI     SPI     SPI    
-40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85    
TSSOP | 24     TSSOP | 28     VQFN | 24     VQFN | 24     VQFN | 32    
31.63 | 1ku     34.50 | 1ku          
12     25     18     4.5     4.4    
24TSSOP: 34 mm2: 4.4 x 7.8 (TSSOP | 24)     28TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 28)     24VQFN: 20 mm2: 4 x 5 (VQFN | 24)     24VQFN: 20 mm2: 4 x 5 (VQFN | 24)     32VQFN: 25 mm2: 5 x 5 (VQFN | 32)    
Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma    
Differential     Differential     Differential     Differential     Differential    
   
Multiplexed     Multiplexed    
   
Simultaneous Sampling    
Ext     Ext     Ext     Ext     Ext    
   
PGA     PGA     PGA     PGA    
2.5     2.5     2.5     2.5     2.5    
2.5     0.039     0.039     0.156     0.156    
-2.5
0    
-2.5
0    
-2.5
0    
-2.5
0    
-2.5
0    
2.5
5    
2.5
5    
2.5
5    
2.5
5    
2.5
5    
1.65     1.65     1.65     2.25     2.25    
3.6     3.6     3.6     3.6     3.6    
130     130     130     119      
-122     -122     -122     -115     -115    
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