Octal, 144kHz, Simultaneous Sampling 24-Bit Delta Sigma ADC - ADS1278

ADS1278 (ACTIVE)

Octal, 144kHz, Simultaneous Sampling 24-Bit Delta Sigma ADC

Description

Based on the single-channel ADS1271, the ADS1274 (quad) and ADS1278 (octal) are 24-bit, delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with data rates up to 144k samples per second (SPS), allowing simultaneous sampling of four or eight channels. The devices are offered in identical packages, permitting drop-in expandability.

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 specifications are significantly weaker than respective industrial counterparts. The ADS1274 and ADS1278 combine these types of converters, allowing high-precision industrial measurement with excellent dc and ac specifications.

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. These ADCs provide a usable signal bandwidth up to 90% of the Nyquist rate with less than 0.005dB of ripple.

Four operating modes allow for optimization of speed, resolution, and power. All operations are controlled directly by pins; there are no registers to program. The devices are fully specified over the extended industrial range (–40°C to +105°C) and are available in an HTQFP-64 PowerPAD™ package.

Features

  • Simultaneously Measure Four/Eight Channels
  • Up to 144kSPS Data Rate
  • AC Performance:
    70kHz Bandwidth
    111dB SNR (High-Resolution Mode)
    –108dB THD
  • DC Accuracy:
    0.8µV/°C Offset Drift
    1.3ppm/°C Gain Drift
  • Selectable Operating Modes:
    High-Speed: 144kSPS, 106dB SNR
    High-Resolution: 52kSPS, 111dB SNR
    Low-Power: 52kSPS, 31mW/ch
    Low-Speed: 10kSPS, 7mW/ch
  • Linear Phase Digital Filter
  • SPI™ or Frame-Sync Serial Interface
  • Low Sampling Aperture Error
  • Modulator Output Option (digital filter bypass)
  • Analog Supply: 5V
  • Digital Core: 1.8V
  • I/O Supply: 1.8V to 3.3V
  • APPLICATIONS
    • Vibration/Modal Analysis
    • Multi-Channel Data Acquisition
    • Acoustics/Dynamic Strain Gauges
    • Pressure Sensors

    PowerPAD is a trademark of Texas Instruments, Inc.
    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 ADC (<=10MSPS)

     
    Resolution (Bits)
    Sample Rate (max) (SPS)
    # Input Channels
    Multi-Channel Configuration
    Input Range (Min)
    Input Range (Max)
    Interface
    Architecture
    Integrated Features
    INL (Max) (+/-LSB)
    Rating
    Operating Temperature Range (C)
    Pin/Package
    Approx. Price (US$)
    Input Type
    THD (Typ) (dB)
    SNR (dB)
    Reference Mode
    ADS1278 ADS1174 ADS1178 ADS1271 ADS1274
    24     16     16     24     24    
    144kSPS     52kSPS     52kSPS     105kSPS     144kSPS    
    8     4     8     1     4    
    Simultaneous Sampling       Simultaneous Sampling       Simultaneous Sampling    
    0       0     0     0    
    5.25       5.25     5.25     5.25    
    Serial SPI     Serial SPI     Serial SPI     Serial SPI     Serial SPI    
    Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma    
    Daisy-Chainable     Simultaneous Sampling       Daisy-Chainable     Daisy-Chainable    
    201.4     0.0045     1     251.7     201.4    
    Catalog     Catalog     Catalog     Catalog     Catalog    
    -40 to 105     -40 to 85     -40 to 85     -40 to 105     -40 to 125    
    64HTQFP     64HTQFP     64HTQFP     16TSSOP     64HTQFP    
    25.15 | 1ku     6.00 | 1ku     8.00 | 1ku     6.31 | 1ku     14.65 | 1ku    
    Differential       Differential
    Single-Ended    
    Differential     Differential    
    -108       -105     -105     -108    
    111     97     97     109     111    
    Ext     Ext     Ext     Ext     Ext    

    Other qualified versions of ADS1278

    Version Part Number Definition
    High-Temperature ADS1278-HT High-Temperature product for harsh environments
    Enhanced Product ADS1278-EP Supports Defense, Aerospace and Medical Applications

    Companion parts

    Part # Name Product Family Comments
    THS4521   Very low power rail-to-rail output fully differential amplifier   OPERATIONAL AMPLIFIER - HIGH SPEED AMPLIFIER    Ultra-Low Power, Fully Differential ADC drivers for the ADS127x Delta-Sigma ADC Family  
    ADS1278-HT   High Temperature Quad/Octal, Simultaneous Sampling, 24-Bit Analog-to-Digital Converters   ANALOG TO DIGITAL CONVERTER - PRECISION ADC (<=10MSPS)    High Temperature Octal, Simultaneous Sampling, 24-Bit ADC  
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