Ultra-High Resolution, 4kSPS, 2-Ch Delta Sigma ADC for Seismic & Energy Exploration - ADS1282

ADS1282 (ACTIVE)

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

 

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) (SPS)
# Input Channels
Input Type
Power Consumption (Typ) (mW)
Input Range (Min) (V)
Input Range (Max) (V)
Interface
Features
Analog Voltage AVDD (Min) (V)
Analog Voltage AVDD (Max) (V)
Architecture
Operating Temperature Range (C)
Pin/Package
THD (Typ) (dB)
SNR (dB)
Reference Mode
ADS1282 ADS1281 ADS1287 ADS1287D
31    31    24    24   
4000    4000    1000    1000   
1    1    1    2   
Differential    Differential    Differential    Differential   
25    12    4.5    4.4   
-1.9
0.7   
-2.7
0   
  -1.6
1   
1.4
4   
2.75
5.35   
  1.4
4   
Serial    Serial    SPI    SPI   
    PGA     
-2.5
0   
-2.5
0   
-2.5
0   
-2.5
0   
2.5
5   
2.5
5   
2.5
5   
2.5
5   
Delta-Sigma    Delta-Sigma    Delta-Sigma    Delta-Sigma   
-40 to 85    -40 to 85    -40 to 85    -40 to 85   
28TSSOP    24TSSOP    24VQFN    32VQFN   
-122    -122    -115    -115   
130    130    116    114   
Ext    Ext    Ext    Ext   

Other qualified versions of ADS1282

Version Part Number Definition
High-Temperature ADS1282-HT High-Temperature product for harsh environments
Space ADS1282-SP Radiation tolerant, ceramic packaging and qualified for use in Space-based application

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