參數(shù)資料
型號(hào)： 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)： 37/38頁
文件大?。?/td> 209K
代理商： 935198040551
1999 May 27
8
Philips Semiconductors
Product specication
SDH/SONET data and clock recovery unit
STM1/4/16 OC3/12/48 GE
OQ2541HP; OQ2541U
Fig.6 Schematic diagram of OQ2541 power control loop.
(1) L1 = RF choke type Murata BLM21 or equivalent.
handbook, full pagewidth
2
R1
2
1 k
1
k
1
F
L1(1)
4.5 V
β > 100
100 nF
3.3
nF
MGL732
BAND GAP
REFERENCE
VEE
PC
GND
off chip
on chip
Fig.7 Functionality of pin AREF.
handbook, halfpage
MGL667
500
16 k
RAREF
VEE
AREF
off chip
on chip
VAREF
GND
If the outputs are AC-coupled, the formulae for calculating
the required voltage on pin AREF and the value of the
resistor connected between pins AREF and VEE as
follows:
(1)
and:
(2)
where R1 = 500
, R2 = 16 k and VEE = 3.3 V.
To maintain a single-ended swing of 200 mV (p-p) across
a 50
AC-coupled load, the voltage on pin AREF must be
This can be achieved by connecting a 7.3 k
resistor
between pins AREF and VEE.
V
AREF
R
L
R
o
+
R
L
--------------------
0.5V
swing
×
–
=
R
AREF
R1
V
EE
V
AREF
-----------------
1
–
×
1
R1
R2
--------
V
EE
V
AREF
-----------------
1
–
×
–
----------------------------------------------------------------
=
100 mV
–
50 + 100
()
50
-----------------------------------
×
300 mV
–
=
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