ADS1278-SP Radiation Hardened 24-Bit 8-Ch Simultaneous-Sampling Delta-Sigma ADC | TI.com

ADS1278-SP
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Radiation Hardened 24-Bit 8-Ch Simultaneous-Sampling Delta-Sigma ADC

 

Description

The ADS1278-SP (octal) is a 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with data rates up to 128k 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-SP 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 temperature range of –55°C to 125°C and is available in an 84-pin HFQ package.

Features

  • Radiation Hardened
    • TID 75 krad(Si)
    • TID Radiation Lot Acceptance Test (RLAT) TBD
    • Single Event Latchup (SEL) Immune to LET 68 MeV-cm2/mg @ 125°C
  • Simultaneously Samples Eight Channels
  • Up to 128-kSPS Data Rate
  • AC Performance:
    • 63-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

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Parametrics

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Part number Order Resolution (Bits) Sample rate (Max) (kSPS) Number of input channels Interface Operating temperature range (C) Package Group 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-SP Order now 24     128     8     SPI     -55 to 115
-55 to 125
25 to 25    
CFP | 84     530     84CFP: 190 mm2: 13.8 x 13.8 (CFP | 84)     Delta-Sigma     Differential     Simultaneous Sampling     Ext     Daisy-Chainable     5.25     0     4.75     5.25     1.65     2.2     201.4     111     -108     Space    
ADC128S102QML-SP Samples not available 12     1000     8     Microwire (Serial I/O)
QSPI
SPI    
-55 to 125
25 to 25    
CFP | 16     2.3     16CFP: 63 mm2: 6.35 x 9.906 (CFP | 16)     SAR     Single-Ended     Multiplexed     Supply       5.25     0     2.7     5.25     2.7     5.25     1.1     72     -87     Space    
ADS1282-SP Samples not available 31     4     2     SPI     -55 to 115
-55 to 125
25 to 25    
CFP | 28     25     28CFP: 232 mm2: 12.7 x 18.23 (CFP | 28)     Delta-Sigma     Differential     Multiplexed     Ext     PGA     1.15
3.75    
-1.9
0.7    
4.75     5.25     1.65     3.6     17179.9     130     -122     Space