AK1547 Datasheet, PDF (18/37 Pages) Asahi Kasei Microsystems – 4GHz Low Noise Integer-N Frequency Synthesizer

[AK1547]
Notes for writing into registers
After powers on AK1547, 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 ({PD1}=”1” is recommended)
- Bring [PDN] to ”1 (High)”
- Program {PD1} in Address2 to “0”
(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)”
MS1464-E-00
18
2012/9