3
Agere Systems Inc.
Data Sheet, Rev. 1
September 2002
C482, C484, and C486 (C48-Type)
2.5 Gbits/s Cooled Laser Transmitters
Characteristics
Minimum and maximum values specified over operating case temperature range at 50% duty cycle data signal.
Typical values are measured at room temperature unless otherwise noted.
1. Inputs are ac-coupled into an equivalent input impedance of 50
.
2. Single-ended or differential operation may used. If the inputs are driven single-ended, the unused inputs must be terminated in 50
.
3. Clocked operation is optional. For clocked operation, pin 5 must be a logic 0. With clocked operation, the optical output changes state with
the rising edge of the input clock signal.
4. If left unselected, clocked operation will be selected.
5. Deviation due to temperature variation detected by the thermistor.
6. This voltage is measured from pin 2 to GND.
7. Frequency range: 100 kHz—2 GHz.
8. At frequency of 2.5 GHz.
Table 2. Electrical Characteristics
Parameter
Symbol
V
CC
Min
4.75
Typ
5.0
Max
5.25
Unit
V
dc Power Supply Voltage
dc Power Supply Current:
C482, C484
C486
Power Dissipation
Input Data/Clock Voltage:
1, 2
Single-ended Input
Differential Input
Nonclocked/Clocked Select Voltage:
3, 4
Clocked Operation
Nonclocked Operation
Input Impedance
Transmitter Enable Voltage (TTL) V
IL
Transmitter Disable Voltage (TTL) V
IH
Wavelength Selection Voltage (TTL) V
IL
Wavelength Selection Voltage (TTL) V
IH
λ
Deviation
Alarm:
Levels (CMOS) V
OL
Levels (CMOS) V
OH
Setting (active-high)
5
Laser Bias Monitor Voltage (default)
Laser Degrade Alarm (option):
Levels (CMOS) V
OH
Levels (CMOS) V
OL
Setting (active-low)
Laser Back-facet Monitor Voltage (50% duty
cycle)
6
Clock Duty Cycle
TEC Current
TEC Voltage
Return Loss:
7, 8
Input Data
Input Clock
I
CC
I
CC
P
DIS
—
—
—
350
—
4.5
400
500
5.2
mA
mA
W
V
IN
V
IN
250
125
0.0
2.0
—
0.0
2.0
0.0
2.0
900
450
1300
650
mVp-p
mVp-p
V
SEL_CLK
V
DIS_CLK
R
IN
V
EN
V
DIS
V
N
V
λ
N – 1
—
—
50
—
—
—
—
0.8
V
CC
—
0.8
V
CC
0.8
V
CC
V
V
V
V
V
V
V
NO-
λ
ALARM
V
λ
ALARM
λ
ALARM
V
LBM
0
4.5
–100
—
—
—
—
20
0.3
V
CC
100
—
V
V
pm
mV/mA
V
NO-ALARM
V
ALARM
LD
ALARM
V
BF
4.5
0
—
—
—
—
—
500
V
CC
0.3
55
—
V
V
mA
mV/mW
C
DC
I
TEC
V
TEC
40
—
3.0
50
0.6
3.3
60
1.2
3.5
%
A
V
RL
DATA
RL
CLK
–10
–12
—
—
—
—
dB
dB