ADS1278 24-Bit, 144kSPS, 8-Ch Simultaneous-Sampling Delta-Sigma ADC for Wide Bandwidth Applications | TI.com

ADS1278 (ACTIVE)

24-Bit, 144kSPS, 8-Ch Simultaneous-Sampling Delta-Sigma ADC for Wide Bandwidth Applications

 

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.

    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) INL (Max) (+/-LSB) SNR (dB) THD (Typ) (dB) Rating
    ADS1278 Order now 24     144     8     SPI     -40 to 105     HTQFP | 64     25.15 | 1ku     530     64HTQFP: 144 mm2: 12 x 12 (HTQFP | 64)     Delta-Sigma     Differential     Simultaneous Sampling     Ext     Daisy-Chainable     5.25     0     4.75     5.25     1.65     2.2       111     -108     Catalog    
    ADS1174 Order now 16     52     4     SPI     -40 to 85     HTQFP | 64     6.30 | 1ku     135     64HTQFP: 144 mm2: 12 x 12 (HTQFP | 64)     Delta-Sigma     Differential
    Single-Ended    
    Simultaneous Sampling     Ext     Daisy-Chainable     5.25     0     4.75     5.25     1.65     1.95     0.0045     97     -105     Catalog    
    ADS1178 Order now 16     52     8     SPI     -40 to 85     HTQFP | 64     8.80 | 1ku     245     64HTQFP: 144 mm2: 12 x 12 (HTQFP | 64)     Delta-Sigma     Differential
    Single-Ended    
    Simultaneous Sampling     Ext     Daisy-Chainable     5.25     0     4.75     5.25     1.65     1.95     1     97     -105     Catalog    
    ADS1271 Order now 24     105     1     SPI     -40 to 105     TSSOP | 16     6.31 | 1ku     92