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參數(shù)資料
| 型號： | 935198040551 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | CLOCK RECOVERY CIRCUIT, PQFP48 |
| 封裝： | PLASTIC, SOT-313, LQFP-48 |
| 文件頁數(shù)： | 4/38頁 |
| 文件大?。?/td> | 209K |
| 代理商： | 935198040551 |
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1999 May 27
12
Philips Semiconductors
Product specication
SDH/SONET data and clock recovery unit
STM1/4/16 OC3/12/48 GE
OQ2541HP; OQ2541U
DIVIDER SETTINGS
The reference frequency dividers and the STM mode
selectors still operate the same in a positive supply voltage
application. The only difference is that pins formerly
connected to ground should now be connected to VCC
(+5 V). Pins connected to VEE should still be connected to
VEE because connecting these pins to ground (0 V) will
damage the IC.
RF INPUT AND OUTPUTS
All RF inputs, outputs and internal signals of the OQ2541
are referenced to pins GND. In the positive supply voltage
application, this means that all RF signals are referenced
to VCC. Therefore a clean VCC rail is of ultimate importance
for proper RF performance. The best performance is
obtained when the transmission line reference plane is
also decoupled to VCC. Careful design of VCC and good
decoupling schemes should be taken into account. While
designing the printed-circuit board, bear in mind that the
VCC has become what was formerly ground.
While laying out the application, the return path is the most
important issue to be considered. It is always advised to
examine carefully the current carrying loops in the design.
Care should be taken that for all frequencies (both of
interest and not of interest) low ohmic and low inductance
return paths are available. These return paths should
preferably have an enclosed area as small as possible,
both horizontally and vertically (by means of through-holes
or vias). The position of a decoupling capacitor is very
important. A decoupling capacitor on an unfavourable
position could do more damage than completely omitting
the capacitor, while on the right location it can mean the
difference between mediocre results and the ultimate
achievement.
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