oq2541bhp NXP Semiconductors, oq2541bhp Datasheet - Page 8
oq2541bhp
Manufacturer Part Number
oq2541bhp
Description
Oq2541bhp; Oq2541bu Sdh/sonet Data And Clock Recovery Unit Stm1/4/16 Oc3/12/48 Ge
Manufacturer
NXP Semiconductors
Datasheet
1.OQ2541BHP.pdf
(40 pages)
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Philips Semiconductors
2000 Sep 18
handbook, halfpage
handbook, full pagewidth
SDH/SONET data and clock recovery unit
STM1/4/16 OC3/12/48 GE
(1) L1 = RF choke type Murata BLM21 or equivalent.
Fig.7 Functionality of pin AREF.
500
16 k
on chip
Fig.6 Schematic diagram of OQ2541B power control loop.
V EE
GND
AREF
off chip
2
V AREF
R AREF
MGL667
1 k
100 nF
BAND GAP
REFERENCE
V EE
R1
6.8
100
1
k
8
PC
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 V
follows:
and:
where R1 = 500 , R2 = 16 k and V
To maintain a single-ended swing of 200 mV (p-p) across
a 50
This can be achieved by connecting a 7.3 k resistor
between pins AREF and V
V
R
–
AREF
100 mV
3.3
AREF
nF
L1
(1)
AC-coupled load, the voltage on pin AREF must be
=
=
GND
–
----------------------------------------------------------- -
1
R
-------------------- -
–
-------------------------------- -
L
MGT205
R1
50 + 100
R
1 F
+
R1
------- -
R2
L
50
OQ2541BHP; OQ2541BU
R
on chip
off chip
O
--------------- - 1
V
4.5 V
V
AREF
--------------- - 1
V
0.5V
EE
V
AREF
EE
=
–
EE
swing
–
–
.
300 mV
Product specification
EE
= 3.3 V.
EE
are as
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