SBASB74 October 2024 ADS127L21B
PRODUCTION DATA
Figure 9-8 shows an application of the ADS127L21B used in a precision data acquisition system. Many sensors are limited in the amount of high-frequency signal content. For this reason, a first- or second-order filter can be sufficient to filter the high-frequency noise of the sensor and amplifier to prevent aliasing the noise to the pass band. However, in some applications the signal is unknown, requiring the use of a high-order antialiasing filter. The goal of this design is a THS4551 FDA antialias filter at the ADC input to attenuate out-of-band signals at the modulator sample rate (fMOD).