oq2541u NXP Semiconductors, oq2541u Datasheet - Page 12

• Manufacturer Part Number: oq2541u
• Description: Sdh/sonet Data And Clock Recovery Unit Stm1/4/16 Oc3/12/48 Ge
• Manufacturer: NXP Semiconductors

Philips Semiconductors
D
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 V
(+5 V). Pins connected to V
V
damage the IC.
RF
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 V
for proper RF performance. The best performance is
obtained when the transmission line reference plane is
also decoupled to V
decoupling schemes should be taken into account. While
designing the printed-circuit board, bear in mind that the
V
1999 May 27
EE
CC
IVIDER SETTINGS
SDH/SONET data and clock recovery unit
STM1/4/16 OC3/12/48 GE
INPUT AND OUTPUTS
CC
because connecting these pins to ground (0 V) will
has become what was formerly ground.
. Therefore a clean V
CC
. Careful design of V
CC
EE
rail is of ultimate importance
should still be connected to
CC
and good
CC
12
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.
OQ2541HP; OQ2541U
Product specification