AK1545 Datasheet, PDF (20/39 Pages) Asahi Kasei Microsystems – 3.5GHz Low Noise Integer-N Frequency Synthesizer

[AK1545]
Notes for writing into registers
After powers on AK1545, [PDN] must be “0” or {PD1} must be “1”.
After powers on AK1545, the initial registers value are not defined. It is required to write the data in all addresses
in order to commit it.
[Examples of writing into registers]
(Ex. 1) Power-On
- Bring [PDN] to ”0 (Low)”
- Apply VDD
- Program Address0, Address1 and Address2
- Bring [PDN] to ”1 (High)”
(Ex. 2) Changing frequency settings : Initialization
- Program Address3
- Program Address1
(Ex. 3) Changing frequency settings : Counter reset
- Program Address2. As part of this, load “1” to both {PD1} and {CNTR_RST}.
- Program Address1
- Program Address2. As part of this, load “0” to both {PD1} and {CNTR_RST}.
(Ex. 4) Changing frequency settings : PDN pin method
- Bring [PDN] to ”0 (Low)”
- Program Address1
- Bring [PDN] to ”1 (High)”
MS1471-E-00
20
2012/10