ADS1287 Low-Power, 1kSPS, 1-Ch Delta-Sigma ADC With PGA for Seismic and Energy Exploration | TI.com

ADS1287 (ACTIVE)

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

 

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Description

The ADS1287 device is a low-power, 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 seismic equipment requiring precision digitizing with low power consumption.

The ADC features a programmable-gain, high-impedance complementary metal oxide semiconductor (CMOS) 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).

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.

Together, the amplifier, modulator, and digital filter dissipate 4.5 mW in high-resolution mode (2.4 mW in low-power mode). The ADC is packaged in a compact 5-mm × 4-mm VQFN package. The ADC is fully specified over the –40°C to +85°C temperature range.

Features

  • Selectable Operating Modes
  • High-Resolution Mode:
    • SNR: 113 dB (1000 SPS, Gain = 1)
    • Power: 4.5 mW
  • Low-Power Mode:
    • SNR: 110 dB (1000 SPS, Gain = 1)
    • Power: 2.4 mW
  • THD: –115 dB
  • CMRR: 115 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
  • 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) (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
ADS1287 ADS1281 ADS1282 ADS1283 ADS1284 ADS1287D
24     31     31     31     31     24    
1     4     4     4     4     1    
1     1     2     2     2     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    
VQFN | 24     TSSOP | 24     TSSOP | 28     VQFN | 24     VQFN | 24     VQFN | 32    
  31.63 | 1ku     34.50 | 1ku          
4.5     12     25     18     12     4.4    
24VQFN: 20 mm2: 4 x 5 (VQFN | 24)     24TSSOP: 50 mm2: 6.4 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     Delta-Sigma    
Differential     Differential     Differential     Differential     Differential     Differential    
   
   
Multiplexed     Multiplexed     Multiplexed     Simultaneous Sampling    
Ext     Ext     Ext     Ext     Ext     Ext    
PGA    
   
PGA     PGA     PGA     PGA    
2.5     2.5     2.5     2.5     2.5     2.5    
0.156     2.5     0.039     0.039     0.039     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    
2.25     1.65     1.65     1.65     1.65     2.25    
3.6     3.6     3.6     3.6     3.6     3.6    
119     130     130     130     127