AK1573 Datasheet, PDF (34/42 Pages) Asahi Kasei Microsystems – Low Noise Integrated VCO

[AK1573/AK1573B/AK1573C]
14. Power on sequence
1. Recommended sequence
PVDD、AVDD
CPVDD
PDN1
LDO
OFF
Register Writing
Register Writing available
ON
10μs
10ms
<0x04>
<0x03>
<0x02>
<0x01>
<0x01>
PDN2
Synth
/VCO
PDN
Un-
stable
Active
2. The sequence when PDN1 pin and PDN2 pin are powered on simultaneously
PVDD、AVDD
CPVDD
PDN1
LDO
OFF
Register Writing
Register Writing available
ON
10ms
<0x05> <0x04> <0x03> <0x02> <0x01>
PDN2
Synthe
・VCO
PDN
Un-stable
Active
Figure.28 Power on sequence
* After powering on AK1573, the initial register’s values are not defined. It is required to write
the data to all the registers.
* It takes about 10msec from PDN1 pin rise-up to LDO rise-up.
* If PDN1 pin and PDN2 pin are powered on simultaneously, the operation of AK1573 is not
defined until the registers are set.
015009351-E-00
- 34 -
2015/8