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

ADS1278-SP (ACTIVE)

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 Compare all products in Precision ADCs (<=10MSPS)

 
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)
SINAD (dB)
SNR (dB)
THD (Typ) (dB)
Rating
ADS1278-SP ADC128S102QML-SP ADS1282-SP
24     12     31    
128     1000     4    
8     8     2    
SPI     Microwire (Serial I/O)
QSPI
SPI    
SPI    
-55 to 115
-55 to 125
25 to 25    
-55 to 125
25 Only    
-55 to 115
-55 to 125
25 to 25    
CFP | 84     CFP | 16     CFP | 28    
530     2.3     25    
See datasheet (CFP)     See datasheet (CFP)     See datasheet (CFP)    
Delta-Sigma     SAR     Delta-Sigma    
Differential     Single-Ended     Differential    
Simultaneous Sampling     Multiplexed     Multiplexed    
Ext     Supply     Ext    
Daisy-Chainable       PGA    
5.25     5.25     1.15
3.75    
0     0     -1.9
0.7    
4.75     2.7     4.75    
5.25     5.25     5.25    
1.65     2.7     1.65    
2.2     5.25     3.6    
201.4     1.1     17179.9    
  72     122    
111     72     130    
-108     -87     -122    
Space     Space     Space