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參數(shù)資料
| 型號： | OQ2541BHP |
| 英文描述： | CLOCK/DATA RECOVERY|BIPOLAR|QFP|48PIN|PLASTIC |
| 中文描述： | 時鐘/數(shù)據(jù)恢復|雙極| QFP封裝| 48PIN |塑料 |
| 文件頁數(shù)： | 7/40頁 |
| 文件大?。?/td> | 292K |
| 代理商： | OQ2541BHP |
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2000 Sep 18
7
Philips Semiconductors
Product specification
SDH/SONET data and clock recovery unit
STM1/4/16 OC3/12/48 GE
OQ2541BHP; OQ2541BU
MGL669
VEE
DINQ,
CREFQ
DIN,
CREF
50
50
Fig.4 RF data and clock input circuit.
handbook, halfpage
MGL670
VAREF
VEE
DOUTQ, COUTQ
DOUT, COUT
100
100
Fig.5 RF data and clock output circuit.
Power supply and power control loop
The OQ2541B 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.
Asuitablecircuitwithapowersupplyof
4.5 Visillustrated
in Fig.6. Do not omit the 2
resistor in series with the
100 nF decoupling capacitor.
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 an RF choke with an
impedance greater than 50
at frequencies higher than
2 MHz. Any transistor with a
β
of approximately 100 and
sufficient current sink capability can be used.
The OQ2541B 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
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 V
EE
initially fixes this level.
In most applications, the outputs will be DC coupled to a
50
load. The output level regulation circuit will maintain
a 200 mV (p-p) single-ended swing across this load. The
voltage onpin AREF ishalf 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
R
-----R
signal multiplied by a factor
where R
L
is the external load and R
o
is the output
impedance of the OQ2541B (100
).
The resulting output amplitude with the same voltage on
pin AREF is thus different for DC and AC coupled loads.
POWER SUPPLY
4.5 V
5.0 V
5.2 V
RESISTOR R1
6.8
8.2
10.0
R
o
+
L
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| OQ2541HP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:SDH/SONET data and clock recovery unit STM1/4/16 OC3/12/48 GE |
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