ADS1284 Ultra-high-resolution 4kSPS 2-ch ADC w/ PGA and low-power mode for seismic and geospace exploration | TI.com

ADS1284 (ACTIVE)

Ultra-high-resolution 4kSPS 2-ch ADC w/ PGA and low-power mode for seismic and geospace exploration

 

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Description

The ADS1284 is a high-performance, single-chip, analog-to-digital converter (ADC). This device includes a low-noise programmable gain amplifier (PGA), delta-sigma (ΔΣ) modulator, and digital filter. The ADC supports two modes of operation with trade-offs between power and resolution.

The two-channel multiplexer has the inputs for signal measurement and an ADC signal test. A mode is available to short circuit the inputs and test for internal noise. The PGA has the high input impedance and low noise, which provides for the direct connection of geophone and hydrophone sensors.

The fourth-order, inherently stable modulator provides outstanding noise and linearity performance. The modulator output is filtered and decimated by the on-chip digital filter to yield the ADC conversion result.

The digital filter provides data rates from 250 to 4000 SPS. The high-pass filter (HPF) has a programmable corner frequency. On-chip gain and offset scale registers support system calibration.

The synchronization input controls the timing of the ADC conversion. The power-down input puts the ADC into power-down mode.

The ADS1284 is available in a compact 24-lead, 5-mm × 4-mm VQFN package, and is fully specified from –40°C to +85°C, with a maximum operating temperature range of –50°C to +125°C.

Features

  • Selectable Operating Modes
  • Low-Power Mode
    • 12 mW (PGA = 1, 2, 4 and 8)
    • 127 dB SNR (250 SPS, PGA = 1)
  • High-Resolution Mode
    • 18 mW (PGA = 1, 2, 4 and 8)
    • 130 dB SNR (250 SPS, PGA = 1)
  • THD: –122 dB
  • CMRR: 110 dB
  • Two-Channel Multiplexer
  • Inherently-Stable Modulator
  • Fast Responding Overrange Detector
  • Flexible Digital Filter:
    • Sinc + FIR + IIR (Selectable)
    • Linear or Minimum Phase Option
    • Programmable High-Pass Filter
  • Offset and Gain Calibration
  • SYNC Input
  • Analog Supply: 5 V or ±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) (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
ADS1284 ADS1282 ADS1283 ADS1287
31     31     31     24    
4     4     4     1    
2     2     2     1    
SPI     SPI     SPI     SPI    
-40 to 85     -40 to 85     -40 to 85     -40 to 85    
VQFN | 24     TSSOP | 28     VQFN | 24     VQFN | 24    
  34.50 | 1ku        
12     25     18     4.5    
24VQFN: 20 mm2: 4 x 5 (VQFN | 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    
Differential     Differential     Differential     Differential    
Multiplexed     Multiplexed     Multiplexed    
   
Ext     Ext     Ext     Ext    
PGA     PGA     PGA     PGA    
2.5     2.5     2.5     2.5    
0.039     0.039     0.039     0.156    
2.5
0    
-2.5
0    
-2.5
0    
-2.5
0    
2.5
5    
2.5
5    
2.5
5    
2.5
5    
1.65     1.65     1.65     2.25    
3.6     3.6     3.6     3.6    
127     130     130     119    
-122     -122     -122     -115    
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