ADS1271 24-Bit, 105kSPS, 1-Ch Delta-Sigma ADC for Wide Bandwidth Applications | TI.com

ADS1271 (ACTIVE)

24-Bit, 105kSPS, 1-Ch Delta-Sigma ADC for Wide Bandwidth Applications

 

Recommended alternative parts

  • ADS127L01  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   ADS127L01 is a high speed delta-sigma data converter with wider bandwidth, lower noise, and power scalability options.

Description

The ADS1271 is a 24-bit, delta-sigma analog-to-digital converter (ADC) with a data rate up to 105kSPS. It offers a unique combination of excellent DC accuracy and outstanding AC performance. The high-order, chopper-stabilized modulator achieves very low drift with low in-band noise. The onboard decimation filter suppresses modulator and signal out-of-band noise. The ADS1271 provides a usable signal bandwidth up to 90% of the Nyquist rate with less than 0.005dB of ripple.

Traditionally, industrial delta-sigma ADCs offering good drift performance use digital filters with large passband droop. As a result, they have limited signal bandwidth and are mostly suited for DC measurements. High-resolution ADCs in audio applications offer larger usable bandwidths, but the offset and drift specification are significantly weaker than their industrial counterparts. The ADS1271 combines these converters, allowing high-precision industrial measurement with excellent DC and AC specifications ensured over an extended industrial temperature range.

Three operating modes allow for optimization of speed, resolution, and power. A selectable SPI or a frame-sync serial interface provides for convenient interfacing to microcontrollers or DSPs. The output from the modulator is accessible for external digital filter applications. All operations, including internal offset calibration, are controlled directly by pins; there are no registers to program.

Features

  • 105kSPS Data Rate
  • AC Performance:
    51kHz Bandwidth
    109dB SNR (High-Resolution Mode)
    –108dB THD
  • DC Accuracy:
    1.8µV/°C Offset Drift
    2ppm/°C Gain Drift
  • Selectable Operating Modes:
    High-Speed: 105kSPS Data Rate
    High-Resolution: 109dB SNR
    Low-Power: 35mW Dissipation
  • Power-Down Control
  • Digital Filter:
    Linear Phase Response
    Passband Ripple: ±0.005dB
    Stop Band Attenuation: 100dB
  • Internal Offset Calibration On Command
  • Selectable SPI&™ or Frame Sync Serial Interface
  • Designed for Multichannel Systems:
    Daisy-Chainable Serial Interface
    Easy Synchronization
  • Simple Pin-Driven Control
  • Modulator Output Option
  • Specified from –40°C to +105°C
  • Analog Supply: 5V
  • Digital Supply: 1.8V to 3.3V
  • APPLICATIONS
    • Vibration/Modal Analysis
    • Acoustics
    • Dynamic Strain Gauges
    • Pressure Sensors
    • Test and Measurement

SPI is a trademark of Motorola Inc. All other trademarks are the property of their respective owners.

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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)
INL (Max) (+/-LSB)
SINAD (dB)
SNR (dB)
THD (Typ) (dB)
Rating
ADS1271 ADS1274 ADS1278 ADS127L01 ADS1672 ADS1675
24     24     24     24     24     24    
105     144     144     512     625     4000    
1     4     8     1     1     1    
SPI     SPI     SPI     SPI     Serial     Serial    
-40 to 105     -40 to 125     -40 to 105     -40 to 125     -40 to 85     -40 to 85    
TSSOP | 16     HTQFP | 64     HTQFP | 64     TQFP | 32     TQFP | 64     TQFP | 64    
6.31 | 1ku     14.65 | 1ku     25.15 | 1ku     6.95 | 1ku     12.65 | 1ku     19.32 | 1ku    
92     275     530     7     350     575    
16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)     64HTQFP: 144 mm2: 12 x 12 (HTQFP | 64)     64HTQFP: 144 mm2: 12 x 12 (HTQFP | 64)     32TQFP: 49 mm2: 7 x 7 (TQFP | 32)     64TQFP: 144 mm2: 12 x 12 (TQFP | 64)     64TQFP: 144 mm2: 12 x 12 (TQFP | 64)    
Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma    
Differential     Differential     Differential     Differential     Differential     Differential    
N/A     Simultaneous Sampling     Simultaneous Sampling     N/A     N/A     N/A    
Ext     Ext     Ext     Ext     Ext     Ext    
Daisy-Chainable     Daisy-Chainable     Daisy-Chainable     Daisy-Chainable     N/A     N/A    
5.25     5.25     5.25     3     3.25     3.5    
0     0     0     0     0     0    
4.75     4.75     4.75     2.7     4.75     4.75    
5.25     5.25     5.25     3.6     5.25     5.25    
1.65     1.65     1.65     1.7     2.7     2.85    
3.6     2.2     2.2     3.6     3.3