High Temperature Quad/Octal, Simultaneous Sampling, 24-Bit Analog-to-Digital Converters - ADS1278-HT

ADS1278-HT (ACTIVE)

High Temperature Quad/Octal, Simultaneous Sampling, 24-Bit Analog-to-Digital Converters


Special note

The ADS1278EVM (Evaluation Module) can be used to evaluate the functionality of the ADS1278-HT.

Description

Based on the single-channel ADS1271, the ADS1278 (octal) is a 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with data rates up to 128 k samples per second (SPS), allowing simultaneous sampling of eight channels.

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 ADS1278 combines 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 0.005 dB 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 device is fully specified over the extended industrial range (–55°C to 210°C) and is available in an HTQFP-64 PowerPAD package (–55°C to 175°C), an 84-pin HFQ package and a KGD chiptray option.

Features

  • Simultaneously Measure Eight Channels
  • Up to 128-kSPS Data Rate
  • AC Performance:
    62-kHz Bandwidth
    111-dB SNR (High-Resolution Mode)
    –108-dB THD
  • DC Accuracy:
    0.8-µV/°C Offset Drift
    1.3-ppm/°C Gain Drift
  • Selectable Operating Modes:
    High-Speed: 128 kSPS, 106 dB SNR
    High-Resolution: 52 kSPS, 111 dB SNR
    Low-Power: 52 kSPS, 31 mW/ch
    Low-Speed: 10 kSPS, 7 mW/ch
  • Linear Phase Digital Filter
  • SPI or Frame-Sync Serial Interface
  • Low Sampling Aperture Error
  • Modulator Output Option (digital filter bypass)
  • Analog Supply: 5 V
  • Digital Core: 1.8 V
  • I/O Supply: 1.8 V to 3.3 V
  • Currently Available in an HTQFP-64 PowerPAD™ package,
    an 84-Pin HFQ Package and a KGD Chiptray Option
  • Supports Extreme Temperature Applications
    • Controlled Baseline
    • One Assembly/Test Site
    • One Fabrication Site
    • Available in Extreme (–55°C/210°C) Temperature Range(1)
    • Extended Product Life Cycle
    • Extended Product-Change Notification
    • Product Traceability
    • Texas Instruments High Temperature Products Utilize Highly
      Optimized Silicon (Die) Solutions With Dsign and Process
      Enhancements to Maximize Performance Over Extended Temperatures
  • APPLICATIONS
    • Down-Hole Drilling
    • High Temperature Environments
    • Vibration/Modal Analysis
    • Multi-Channel Data Acquisition
    • Acoustics/Dynamic Strain Gauges
    • Pressure Sensors

(1) Custom temperature ranges available
All other trademarks are the property of their respective owners

View more

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
Input Type
THD (Typ) (dB)
SNR (dB)
Reference Mode
ADS1278-HT
24    
144kSPS    
8    
Simultaneous Sampling    
0    
5.25    
Serial SPI    
Delta-Sigma    
Daisy-Chainable    
201.4    
High Temp    
-55 to 175
-55 to 210    
0XCEPT
64HTQFP
84CFP    
Differential    
-108    
111    
Ext    

Other qualified versions of ADS1278-HT

Version Part Number Definition
Catalog ADS1278 TI's standard catalog product
Enhanced Product ADS1278-EP Supports Defense, Aerospace and Medical Applications
Click Here