PIN FUNCTIONS
Pin No.
Symbol
Function and Application
12
VCC
Supply voltage pin of prescaler, phase
detector, crystal oscillator, VCO buffer.
(Divider Block)
13
LO_out
Monitor pin of comparison frequency at
phase detector.
14
XO_out
Monitor pin of crystal oscillator ÷2 output
at phase detector.
15
PD1
Power down control pin
Low = Whole chip off except XTAL osc.
High = Whole chip on except XTAL osc.
16
PD2
Reference block standby mode.
Low = Reference block disabled.
High = Reference block enabled.
UPB1007K
Internal Equivalent Circuit
17
REFout
Output pin of reference frequency or
crystal oscillator. The frequency from pin
17 can be taken out as 1Vp-p swing.