SC9257 查看數據表（PDF） - Silan Microelectronics

零件编号

产品描述 (功能)

生产厂家

SC9257

0.3-6.0V PLL for digital tuning systems (DTS)

Silan Microelectronics 

Silan

Semiconductors

SC9257

Following is a typical lock detection operation. It shows the operation flow from locked state to frequency change

with a phase error greater than ±6.05µs.

Frequency change

WAIT

Phase error detection start

Reset bit 1

WAIT

Time interval exceeding that of

reference frequcncy cycle

ENABLE=1?

YES

UNLOCK bit =0?

NO

NO (UNLOCK)

YES (Lock)

Check phase error

detection bits PE1,PE2

and PE3

NO

PE1=1,PE2=0,PE3=1?

YES

Phase error=greater than f4.95­s

and less than f6.05­s

Fig.11

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

REV: 1.0

23

2001.10.18

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