SNAS783C June 2020 – February 2021 LMX2820
PRODUCTION DATA
The LMX2820 can be powered up and down using the CE pin or the POWERDOWN bit. In power-down mode, the majority of the device is shut down. However, in power-down mode, the device retains its programming information and can still be programmed, provided that the supply pins still have power applied to them. As this also powers down the internal LDOs, be aware that programming register R0 with POWERDOWN will re-calibrate the VCO if FCAL_EN = 1. In this case, one should re-program register R0 with FCAL_EN = 1 to ensure that this happens with the LDOs at their proper bias level. If the instant calibration is used, then this extra programming of register R0 is unnecessary.