1.1GHZ DUAL PLL

S1T8825

13

PRELIMINARY ( VER.2.1 )

Channel1 and 2 Programmable Counter Division Ratio, N

N = 2

× (32 × B + A), B ≥ A

Division ratio: 192 ~ 262142

Example) A Signal of 453 MHz is entered into Fin1, and divided into 25 kHz steps.

(Reference frequency is 12.5 kHz)

453 MHz

÷ 12.5 kHz = 36240

36240 = 2

× (32 × B + A)

∴ B = (1132)

Example) A Signal of 462.9 MHz is entered into Fin2, and divided into 25 kHz step.

(Reference frequency is 12.5 kHz)

462.9 MHz

÷ 12.5 kHz = 37032

37032 = 2

× (32 × B + A)

∴ B = (1157)

PHASE DETECTOR AND CHARGE PUMP CHARACTERISTICS

Phase difference detection Range: -2

π ~ +2 π

When SW = Low

Figure 6.

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