AK1572 Datasheet, PDF (28/35 Pages) Asahi Kasei Microsystems – Down Converter Mixer with Fractional-N Frequency Synthesizer and VCO

[AK1572]
16. Power up Sequence
PDN Pin
VDD1, VDD2, VDD3
VREF1(LDO)
Register writing
PLL/Synth
Mixer
min. 10msec
1)
2)
min. 500usec
3)
4)
Prohibit
Power Down
Power Down
Unstable
Active
VCO calibration Fast Lock
Active
Lock
1) Set [PDN] pin to “L” and turn on power supplies (VDD1/VDD2/VDD3)
2) The stabilization time for [VREF1] (LDO) is 10msec. After LDO is stabilized, write the data to
the registers of <Address 0x01, 0x02, 0x03, 0x04>
3) Set [PDN] pin to “H”. In this state, the internal circuits are in an operating state, but PLL/Synth
is unstable yet.
4) The stabilization time of internal BIAS circuits is 500usec. After BIAS circuit is stabilized,
write the data to <Address 0x01>. VCO calibration starts and PLL status will be locked. Refer
to 14.Fast Lock Mode and 15.VCO contents regarding fast Lock mode and VCO calibration.
Note1) The initial register values are not defined. Therefore, it is required to write the data in all
addresses of the register.
Note2) The stabilization time for LDO is required more than 10ms.
MS1551-E-00
28
2013/8