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

 

More information

Full data sheet is available. Request now

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

All trademarks are the property of their respective owners.

Parametrics

Compare all products in Precision ADCs (<=10MSPS) Email Download to Excel
Part number Order 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 Order now 24     1     1     SPI     -40 to 85     VQFN | 24       4.5     24VQFN: 20 mm2: 4 x 5 (VQFN | 24)     Delta-Sigma     Differential    
   
Ext     PGA     2.5     0.156     -2.5
0    
2.5
5    
2.25     3.6     119     -115     Catalog    
ADS1281 Samples not available 31     4     1     SPI     -40 to 85     TSSOP | 24     31.63 | 1ku     12     24TSSOP: 34 mm2: 4.4 x 7.8 (TSSOP | 24)     Delta-Sigma     Differential    
   
Ext    
   
2.5     2.5     -2.5
0    
2.5
5    
1.65     3.6     130     -122     Catalog    
ADS1282 Samples not available 31     4     2     SPI     -40 to 85     TSSOP | 28     34.50 | 1ku     25     28TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 28)     Delta-Sigma     Differential     Multiplexed     Ext     PGA     2.5     0.039     -2.5
0    
2.5
5    
1.65     3.6     130     -122     Catalog    
ADS1283 Samples not available 31     4     2     SPI     -40 to 85     VQFN | 24       18     24VQFN: 20 mm2: 4 x 5 (VQFN | 24)     Delta-Sigma     Differential     Multiplexed     Ext     PGA