SBOS487B June 2009 – March 2020 PGA280
The PGA280 uses chopper technology for excellent dc stability over temperature and life of operation. The device is designed to avoid 1/f frequency (flicker) noise, and therefore enables both high resolution and high repeatability for dc measurements. While the chopper noise components are internally filtered, a minimal residual amount of high-frequency switching noise appears at the signal outputs. An external, passive, low-pass filter after the output stage is recommended to remove this switching noise; Figure 48 shows two examples. This filter can also be used to isolate or decouple the charge switching pulses of an A/D converter input.