1 Introduction

The ADS1278QML-SP 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 pass-band droop. As a result, these devices have limited signal bandwidth and are mostly used 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 rate with less than 0.005dB of ripple.

The device is offered in an 84-pin ceramic package. General device information and test conditions are listed in the overview information table. For more detailed technical specifications, user's guides, and application notes, please go to the device product page.