ADS1282 Ultra-High-Resolution, 4kSPS, 2-Ch Delta-Sigma ADC With PGA for Seismic and Energy Exploration | TI.com

ADS1282 (ACTIVE)

Ultra-High-Resolution, 4kSPS, 2-Ch Delta-Sigma ADC With PGA for Seismic and Energy Exploration

Ultra-High-Resolution, 4kSPS, 2-Ch Delta-Sigma ADC With PGA for Seismic and Energy Exploration - ADS1282
Datasheet
 

Description

The ADS1282 is an extremely high-performance, single-chip analog-to-digital converter (ADC) with an integrated, low-noise programmable gain amplifier (PGA) and two-channel input multiplexer (mux). The ADS1282 is suitable for the demanding needs of energy exploration and seismic monitoring environments.

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 flexible input MUX provides an additional external input for measurement, as well as internal self-test connections. The PGA features outstanding low noise (5 nV/√Hz) and high input impedance, allowing easy interfacing to geophones and hydrophones over a wide range of gains.

The digital filter provides selectable data rates from 250 to 4000 samples per second (SPS). The high-pass filter (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 ADS1282s. The SYNC input also accepts a clock input for continuous alignment of conversions from an external source.

Together, the amplifier, modulator, and filter dissipate 25 mW. The ADS1282 is available in a compact TSSOP-28 package and is fully specified from –40°C to +85°C, with a maximum operating range to +125°C.

Features

  • High Resolution:
    130-dB SNR (250 SPS)
  • High Accuracy:
    THD: –122 dB
    INL: 0.5 ppm
  • Low-Noise PGA
  • Two-Channel Input Mux
  • Inherently-Stable Modulator with Fast Responding
    Overrange Detection
  • Flexible Digital Filter:
    Sinc + FIR + IIR (Selectable)
    Linear or Minimum Phase Response
    Programmable High-Pass Filter
    Selectable FIR Data Rates: 250 SPS
    to 4 kSPS
  • Filter Bypass Option
  • Low Power Consumption: 25 mW
    Shutdown: 10 µW
  • Offset and Gain Calibration Engine
  • SYNC Input
  • Analog Supply:
    Unipolar (+5 V) or Bipolar (±2.5 V)
  • Digital Supply: 1.8 V to 3.3 V

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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
ADS1282 ADS1281 ADS1283 ADS1284 ADS1287 ADS1287D
31     31     31     31     24     24    
4     4     4     4     1     1    
2     1     2     2     1     2    
SPI     SPI     SPI     SPI     SPI     SPI    
-40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85    
TSSOP | 28     TSSOP | 24     VQFN | 24     VQFN | 24     VQFN | 24     VQFN | 32    
34.50 | 1ku     31.63 | 1ku            
25     12     18     12     4.5     4.4    
28TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 28)     24TSSOP: 50 mm2: 6.4 x 7.8 (TSSOP | 24)     24VQFN: 20 mm2: 4 x 5 (VQFN | 24)     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     Delta-Sigma    
Differential     Differential     Differential     Differential     Differential     Differential    
Multiplexed     N/A     Multiplexed     Multiplexed     N/A     Simultaneous Sampling    
Ext     Ext     Ext     Ext     Ext     Ext    
PGA     N/A     PGA     PGA     PGA     PGA    
2.5     2.5     2.5     2.5     2.5     2.5    
0.039     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
0    
2.5
5    
2.5
5    
2.5
5    
2.5
5    
2.5
5    
2.5
5    
1.65     1.65     1.65     1.65     2.25     2.25    
3.6     3.6     3.6     3.6     3.6     3.6    
130     130     130     127     119      
-122