AK1590 Datasheet, PDF (31/36 Pages) Asahi Kasei Microsystems – 1GHz Delta-Sigma Fractional-N Frequency Synthesizer

[AK1590]
13. Power-up Sequence
PDN1
On-chip LDO
OFF
Write to the register
PDN2
CP
50s
The register can be written
ON
Internal register values are set
Hi-Z
Output
Fig. 12 Recommended Power-up Sequence
Note 1)
Note 2)
The initial register values are not defined. Therefore, even after [PDN1] is set to “High”, each bit
value remains undefined. In order to set all register values, it is required to write the data in all
addresses of the register.
It is prohibited to do power up and [PDN2] release at the same time. It is mandatory to power up first,
then set [PDN2] to “High”. If they are set simultaneously, initial operation might be unstable.
MS1478-E-01
31
2013/2