There are two main types of ADC used in NI DAQ Devices, SAR(Successive-Approximation-Register) and DSA(Delta-Sigma ADC).
| ||SAR type||DSA type|
| NI DAQ |
- NI 63xx X Series devices and modules
- NI 62xx M Series devices and modules
- NI 61xx S Series devices and modules (Not all)
- NI 60xx E Series devices
- NI 92xx C Series devices and modules (Not all)
- NI 44xx DSA devices and modules
- NI 43xx SC Express devices and modules
The SAR type of ADC is used in most NI Multifunction I/O DAQ devices, not necessarily the case for modular instruments and USB devices. It takes in a continuous analog signal into a discrete format utilizing an approximation register. Also, It utilizes a binary algorithm to convert continuous analog waveform into much smaller discrete outputs.
The DSA type of ADC utilize oversampling, decimation filter, and noise shaping to create high resolution and great anti-aliasing filtering applications. Additionally, it is free-running meaning it’s being sampled prior to any trigger conditions. These features allow to be used for vibration and audio signal analysis as well as strain and pressure measurement. Learn more about the DSA ADC here: Benefits of Delta-Sigma Analog-to-Digital Conversion