ADS1287D (ACTIVE)

Low-Power, 1kSPS, 2-Ch (Simultaneous) Delta-Sigma ADC With PGA for Seismic and Energy Exploration

 

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Description

The ADS1287D device is a dual, simultaneous-sampling, analog-to-digital converter (ADC), with an integrated programmable gain amplifier (PGA) and finite-impulse-response (FIR) digital filter. The ADC is suitable for the demanding needs of low-power, seismic data acquisition.

The ADC features a programmable-gain, high-impedance amplifier suitable for direct connection of geophone and hydrophone sensors to the ADC over a wide range of input signals (±2.5 V to ±0.156 V). Dual 100-nA current sources are integrated into the ADC inputs for field testing of sensors.

The ADC incorporates a fourth-order, inherently stable, delta-sigma (ΔΣ) modulator. The modulator digital output is filtered and decimated by the internal FIR digital filter to yield the ADC conversion result.

The FIR digital filter provides data rates up to 1000 samples per second (SPS). The high-pass filter (HPF) removes DC and low-frequency components from the conversion result. On-chip gain and offset scaling registers support system calibration.

Total device power consumption is 4.4 mW. The ADC is packaged in a compact 5-mm × 5-mm VQFN package and is fully specified over the –40°C to +85°C temperature range.

Features

  • SNR: 114 dB (50 Hz–200 Hz, Gain = 1)
  • Power: 2.2 mW (Per ADC)
  • THD: –115 dB
  • CMRR: 110 dB
  • High-Impedance CMOS PGA:
    • Gains 1, 2, 4, 8, and 16
  • Data Rates: 62.5 SPS to 1000 SPS
  • Flexible Digital Filter:
    • Sinc + FIR + IIR (Selectable)
    • Linear and Minimum Phase Response
    • Programmable High-Pass Filter
  • Sensor-Test Current Sources
  • Offset and Gain Calibration
  • Synchronization Control
  • SPI™-Compatible Interface
  • Analog Power Supply: 5 V or ±2.5 V
  • Digital Power Supply: 2.5 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
Multi-Channel Configuration
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
ADS1287D ADS1281 ADS1282 ADS1283 ADS1287
24    31    31    31    24   
1000    4000    4000    4000    1000   
2    1    1    2    1   
Simultaneous Sampling    N/A    Multiplexed    Multiplexed    N/A   
Differential    Differential    Differential    Differential    Differential   
4.4    12    25    18    4.5   
0.156    2.5    0.039    0.039    0.156   
2.5    2.5    2.5    2.5    2.5   
SPI    SPI    SPI    SPI    SPI   
PGA    N/A    PGA    PGA    PGA   
-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   
Delta-Sigma    Delta-Sigma    Delta-Sigma    Delta-Sigma    Delta-Sigma   
-40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85   
32VQFN    24TSSOP    28TSSOP    24VQFN    24VQFN   
-115    -122    -122    -122    -115   
114    130    130    130    116   
Ext    Ext    Ext    Ext    Ext   

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