e421371 Datasheet, PDF(11/29 Page) Fuji Electric – Fractional-N PLL Frequency Synthesizer

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e421371 Datasheet, PDF (11/29 Pages) Fuji Electric – Fractional-N PLL Frequency Synthesizer

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MB15F83UL

â¢ IF synthesizer Data Setting (Integer)

The divide ratio can be calculated using the following equation :

fVCOIF = [ (P Ã N) + A] Ã foscÃ·R (A < N)

fVCOIF

fosc

: Output frequency of external voltage controlled oscillator (VCO)

: Preset divide ratio of modulus prescaler (8 or 16)

: Preset divide ratio of binary 11 bit programmable counter (3 to 2047)

: Preset divide ratio of binary 4 bit swallow counter (0 to 15)

: Output frequency of the reference frequency oscillator

: Preset divide ratio of binary 14 bit reference counter (3 to 16383)

â¢ Binary 14-bit Programmable Reference Counter Data Setting (RC1 to RC14)

Divide ratio

(R)

RC14 RC13 RC12 RC11 RC10 RC9

RC8

RC7

RC6

RC5

RC4

RC3

RC2

RC1

00000000000011

00000000000100

ï£§

ï£§ï£§ï£§ï£§ï£§ï£§ï£§ï£§ï£§ï£§ï£§ï£§ï£§ï£§

16383

11111111111111

Note : Divide ratio less than 3 is prohibited.

â¢ Binary 11-bit Programmable Counter Data Setting (NC1 to NC11)

Divide ratio (N) NC11 NC10 NC9 NC8 NC7 NC6 NC5 NC4 NC3 NC2 NC1

00000000011

00000000100

ï£§

ï£§ï£§ï£§ï£§ï£§ï£§ï£§ï£§ï£§ï£§ï£§

2047

11111111111

Note : Divide ratio less than 3 is prohibited.

â¢ Binary 4-bit Swallow Counter Data Setting (AC1 to AC4)

Divide ratio (A) AC4 AC3 AC2 AC1

0000

0001

0010

ï£§

ï£§ï£§ï£§ï£§

1111

Note : A < N

â¢ Prescaler Data Setting (SWC)

SWC

Prescaler divide ratio

8/9

16/17

▷