S1T8825X01-R0B0 datasheet(13/16 Pages) SAMSUNG

부품명	S1T8825X01-R0B0

상세설명	1.1GHZ DUAL PLL

PDF	16 Pages

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제조업체	SAMSUNG [Samsung semiconductor]

홈페이지	http://www.samsung.com/Products/Semiconductor

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13 / 16 page

1.1GHZ DUAL PLL

S1T8825

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)

10 = (10001101100)2, A = (16)10 = (10000)2

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)

10 = (10010000101)2, A = (8)10 = (01000)2

PHASE DETECTOR AND CHARGE PUMP CHARACTERISTICS

Phase difference detection Range: -2

π ~ +2 π

When SW = Low

Figure 6.

MSB

LSB

MSB

LSB

r > fp

r = fp

r < fp

S1T8825X01-R0B0 데이터시트(PDF) 13 Page - Samsung semiconductor