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PDF OQ2545HP Data sheet ( Hoja de datos )
| Número de pieza | OQ2545HP | |
| Descripción | SDH/SONET STM16/OC48 laser drivers | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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INTEGRATED CIRCUITS
DATA SHEET
OQ2545HP; OQ2545BHP
SDH/SONET STM16/OC48
laser drivers
Product specification
Supersedes data of 1997 Nov 27
File under Integrated Circuits, IC19
1999 Aug 24
1 page  
Philips Semiconductors
SDH/SONET STM16/OC48 laser drivers
Product specification
OQ2545HP; OQ2545BHP
PINNING
SYMBOL
VEE2
GND
DIOA
GND
LA
LA
LAQ
LAQ
GND
IBIAS
GND
VEE2
VEE2
GND
EFADJ
AMPADJ
SMOD
SIMOD
SIBIAS
GND
DLOOPQ
DLOOP
GND
VEE2
VEE2
GND
CLOOPQ
i.c.
CLOOP
i.c.
GND
CIN
i.c.
CINQ
i.c.
GND
DIN
DINQ
PIN
OQ2545HP OQ2545BHP
11
22
33
44
55
66
77
88
99
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
21 21
22 22
23 23
24 24
25 25
26 26
27 −
− 27
28 −
− 28
29 29
30 −
− 30
31 −
− 31
32 32
33 33
34 34
TYPE(1)
S
S
A
S
O
O
O
O
S
O
S
S
S
S
AI
AI
I
I
I
S
I
I
S
S
S
S
I
−
I
−
S
I
−
I
−
S
I
I
DESCRIPTION
supply voltage for analog section (−6.5 V)
ground supply
temperature sensing diode array connection
ground supply
laser modulation current output
laser modulation current output
inverted laser modulation current output
inverted laser modulation current output
ground supply
laser bias current control output
ground supply
supply voltage for analog section (−6.5 V)
supply voltage for analog section (−6.5 V)
ground supply
input for emitter follower current adjustment
input for preamplifier current adjustment
input for data polarity switch
input for RF modulated output current control
input for DC output current control
ground supply
inverted loop mode data input
loop mode data input
ground supply
supply voltage for analog section (−6.5 V)
supply voltage for analog section (−6.5 V)
ground supply
inverted loop mode clock input
internally connected; internal resistance of 50 Ω to GND
loop mode clock input
internally connected; internal resistance of 50 Ω to GND
ground supply
clock input
internally connected; internal resistance of 50 Ω to GND
inverted clock input
internally connected; internal resistance of 50 Ω to GND
ground supply
data input
inverted data input
1999 Aug 24
5
5 Page 
Philips Semiconductors
SDH/SONET STM16/OC48 laser drivers
Product specification
OQ2545HP; OQ2545BHP
RF connections
A coupled stripline or microstrip with an odd mode
characteristic impedance of 50 Ω (nominal value) should
be used for the differential RF connections on the PCB.
This applies to the CML differential line pairs on pins CIN
and CINQ, DIN and DINQ, CLOOP and CLOOPQ,
DLOOP and DLOOPQ, and MON and MONQ.
In addition, the following lines should not differ in length by
more than 10 mm:
• Lines to pins DIN, DINQ, CIN and CINQ
• Lines to pins CLOOP, CLOOPQ, DLOOP
and DLOOPQ.
ESD protection
In order to achieve high frequency performance, it has
been necessary to make adjustments to the standard ESD
protection scheme. Inputs on pins DIN, DINQ, CIN, CINQ,
DLOOP, DLOOPQ, CLOOP and CLOOPQ and outputs on
pins MON and MONQ are protected by a reduced ESD
structure. The outputs on pins LA and LAQ have no
protection against ESD, so extra care should be taken
with these pins.
Power consumption
The total power consumption of the OQ2545(B)HP
depends strongly on the application. A rough guideline is
given to estimate the power consumption for a specific
application.
The total power dissipation (Ptot) consists of the following
terms:
Ptot = PVEE1 + PVCC + PVEE2 − (PLA + PLAQ + PIBIAS)
where
1. PVEE1 and PVCC represent the power consumption
terms corresponding with the supplies VEE1 and VCC,
required for the digital section and the TTL interfaces.
These 2 terms are application independent and only
depend on the process spread and supply voltages.
Values can be found in Chapter “Characteristics”.
2. PVEE2 = IEE2 × VEE2 represents the power
consumption of the analog section, including the
modulation current and bias current. It is mainly
determined by the magnitude of the modulation
current and bias current and the additional biasing
currents of the preamplifier and emitter followers.
The supply current is the summation:
IEE2 = 55 mA + 1.5 × Imod + IIBIAS + 3 × IAMPADJ
+ 55 × IEFADJ
where IAMPADJ and IEFADJ are the currents through
pins AMPADJ and EFADJ, respectively.
These figures are valid for nominal supply voltage and
temperature and are given for rough indication only.
3. PLA, PLAQ and PIBIAS represent the dissipation in the
external load (laser or EAM), caused by the
modulation and bias current. The expressions are:
PLA = 0.5 × ILA(ext) × VLA,
PLAQ = 0.5 × ILAQ(ext) × VLAQ and
PIBIAS = IIBIAS × VIBIAS.
The factor 0.5 represents the fact that, for a
(scrambled) random data pattern, the modulation
switch will be switched to either side 50% of the time
integrated over many cycles.
VLA and VLAQ are the voltages on pins LA and LAQ
when the modulation current flows through pins LA
and LAQ, respectively and the values depend on the
external laser or EAM supply voltage, the forward
diode voltage drop and additional loads.
To increase the dissipation in the external load and
thereby decreasing the dissipation in the IC, the values
of VLA or VLAQ can be increased by adding
additional external resistors. A minimum value of VLA
and VLAQ is required for proper operation of the IC.
A similar argument is valid for power consumption due
to the bias current. It should be noted that this is
important, because it provides an easy way to lower
the power dissipation of the IC.
Example
Consider the following example to illustrate the calculation
of Ptot. A laser diode operates at 0.3 mW (optical low) and
3 mW (optical high), i.e. an extinction ratio of 10 dB.
For this laser type this requires IBIAS = 20 mA and
ILA(ext) = 40 mA (see Fig.8).
The series resistance of the laser is 30 Ω. Therefore the
ratio is: I-I-L-L--A-A---((-e-i-n-x--t-t-)) = 1--3--0--0-0--
Consequently, a total Imod = (130/100) × 40 = 52 mA will
be generated by the IC.
The impedance connected to pin LAQ is 30 Ω as well.
As a result also ILAQ(ext) = 40 mA and ILAQ(int) = 12 mA
(see Fig.9).
In first instance the eye pattern is of adequate quality and
the preamplifier and emitter follower do not need additional
bias current, i.e. pins AMPADJ and EFADJ can be left
open-circuit.
1999 Aug 24
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet OQ2545HP.PDF ] | |
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