AK1573 Datasheet, PDF (22/42 Pages) Asahi Kasei Microsystems – Low Noise Integrated VCO

[AK1573/AK1573B/AK1573C]
■ Notes on writing registers
1. When PDN1 pin = ”H” and LDO (VREF1 pin) is active, access to the register is available
2. The setting of <Address0x02> and <Address0x03> will be reflected to the behavior of AK1573 when
the register <Address0x01> is written
3. <Address0x04> can be written independently.
4. After PDN1 pin turns to “H”, all of the register values are indefinite. It is needed to write the data to all
the registers to confirm.
Examples of the register setting
Ex.1 Power on setting
1. Set PDN1 pin = ”L” and PDN2 pin = ”L”
2. Power on VCOVDD, PVDD and CPVDD
Note) All VDD should be powered on simultaneously
3. Set PDN1 pin = ”H” and PDN2 pin = ”L” (VBG / LDO are powered on)
4. Write the data to the register <Address0x04>
5. Set PDN1 pin = ”H” and PDN2 pin = ”H” (All blocks are powered on)
6. Write the data to the register <Address0x01> and <Address0x02>
7. Write the data to the register <Address0x01>
Ex.2 Change frequency settings
1. Write the data to the register <Address0x01>
Ex.3 Change Charge Pump settings
1. Write the data to the register <Address0x02>
2. Write the data to the register <Address0x01>
Ex.4 Change Reference dividing ratio
1. Write the data to the register <Address0x03>
2. Write the data to the register <Address0x01>
015009351-E-00
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2015/8