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)： 36/38頁
文件大小： 209K
代理商： 935198040551
1999 May 27
7
Philips Semiconductors
Product specication
SDH/SONET data and clock recovery unit
STM1/4/16 OC3/12/48 GE
OQ2541HP; OQ2541U
Fig.4 RF data and clock input circuit.
MGL669
VEE
DINQ,
CREFQ
DIN,
CREF
50
50
Fig.5 RF data and clock output circuit.
handbook, halfpage
MGL670
VAREF
VEE
DOUTQ, COUTQ
100
100
DOUT, COUT
Power supply and power control loop
The OQ2541 contains an on-board voltage regulator.
An external power transistor is needed to deliver the
supply to this circuit. The required external circuit is
straightforward, and can be built using a few components.
A suitable circuit with a power supply of
4.5 V is illustrated
in Fig.6.
A different configuration could be used, as long as the
power supply rejection ratio is greater than 60 dB for all
frequencies. The inductor is a RF choke with an
impedance greater than 50
at frequencies higher than
2 MHz. Any transistor with a
β > 100 and enough current
sink capability can be used.
The OQ2541 can also be used with a power supply of
5.0 or 5.2 V. The only adaptation to be made to the
power control circuit is to change the emitter resistor R1
(see Table 1).
Table 1
Value of resistor R1.
POWER SUPPLY
RESISTOR R1
4.5 V
2.0
5.0 V
6.8
5.2 V
8.2
Output amplitude reference
The voltage swing at the CML compatible output stages
(pins DOUT, DOUTQ, COUT, COUTQ, DLOOP,
DLOOPQ, CLOOP and CLOOPQ) can be controlled by
adjusting the voltage on pin AREF (see Fig.7). An internal
voltage divider of 500
and 16 k connected between
ground and VEE initially fixes this level.
In most applications the outputs will be DC-coupled to a
load of 50
. The output level regulation circuit will
maintain a 200 mV (p-p) single-ended swing across this
load. The voltage on pin AREF is half the single-ended
peak-to-peak value of the output signal (
100 mV).
No adjustments are necessary with DC-coupling.
If the outputs are AC-coupled, the voltage on pin AREF is
half the single-ended peak-to-peak value of the output
signal multiplied by a factor
where RL is the external load and Ro is the output
impedance of the OQ2541 (100
).
R
L
R
o
+
R
L
--------------------
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