6

MB15C103

s FUNCTIONAL DESCRIPTIONS

Two different frequencies can be selected by DIV input “H” or “L”.

The divide ratios are calculated using the following equation:

÷ R (A < N)

s PHASE DETECTOR TIME CHART

Note: • Phase error detection range: –2

π to +2π

• Pulses on Do output signal during locked state are output to prevent dead zone.

less and continues to be so for three cycles or more.

Symbol

Description

DIV = “H”

DIV = “L”

fvco

Output frequency of external VCO

178.00 MHz

129.55 MHz

fosc

Reference oscillation frequency

12.8 MHz

12.8 MHz

N

Divide ratio of the main counter

27

161

A

Divide ratio of the swallow counter

13

15

P

Preset divide ratio of dual modulus

prescaler

16/17

16/17

R

Divide ratio of the reference counter

32 (fr = 400 kHz)

256 (fr = 50 kHz)

fr

fp

LD

High impedance