nRF52820 emulation on nRF52833 DK
Overview
The nrf52833dk_nrf52820 board is a modified version of the nRF52833 DK that enforces the limitations imposed by the nRF52820 IC, which is a variant of the original nRF52833. Since Nordic does not offer a development kit for the nRF52820 you can use this board to develop for this IC while using the nRF52833 Development Kit (PCA10100).
See nRF52833 DK for more information about the development board and nRF52820 website 1 for the official reference on the IC itself.