1 Features
1• 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

2 Applications
• Space Systems (Satellite, Shuttles, Stations)
– Satellite Temperature and Position Sensing
– Orbital Observation Systems
– Precision and Scientific Applications
– High-Accuracy Instrumentation

3 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.