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

The

ADS1278QML-SP is an 8-channel, 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,

these ADCs have limited signal bandwidth and are mostly designed 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 ADS1278QML-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 frequency with less than 0.005dB of ripple.