ADS1287D Low-Power, 1kSPS, 2-Ch (Simultaneous) Delta-Sigma ADC With PGA for Seismic and Energy Exploration | TI.com

ADS1287D (ACTIVE)

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

Low-Power, 1kSPS, 2-Ch (Simultaneous) Delta-Sigma ADC With PGA for Seismic and Energy Exploration - ADS1287D
 

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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) (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
Sample Rate (Max) (MSPS)
ADS1287D ADS1281 ADS1282 ADS1283 ADS1287
24     31     31     31     24    
1     4     4     4     1    
2     1     1     2     1    
SPI     SPI     SPI     SPI     SPI    
-40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85    
VQFN | 32     TSSOP | 24     TSSOP | 28     VQFN | 24     VQFN | 24    
  31.63 | 1ku     34.50 | 1ku        
4.4     12     25     18     4.5    
32VQFN: 25 mm2: 5 x 5 (VQFN | 32)     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)    
Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma    
Differential     Differential     Differential     Differential     Differential    
Simultaneous Sampling     N/A     Multiplexed     Multiplexed     N/A    
Ext     Ext     Ext     Ext     Ext    
PGA     N/A     PGA     PGA     PGA    
2.5     2.5     2.5     2.5     2.5    
0.156     2.5     0.039     0.039     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    
2.5     1.65     1.65     1.8     2.5    
3.3     3.6     3.6     3.3     3.3    
114     130     130     130     116    
-115     -122     -122     -122     -115    
Catalog     Catalog     Catalog     Catalog     Catalog    
0.001     0.004     0.004     0.004     0.001    

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