Sony CXB1548Q-Y Datasheet
Laser Driver
Description
The CXB1548Q-Y is a high-speed monolithic
Laser Driver/Current Switch with ECL input level.
Open collector outputs are provided at the output
pins (Q, Q) and have the capability of driving
modulation current of 60mApp at a max. data rate of
2.0Gbps (NRZ). DRIVADJ and SDRIV inputs control
the modulation current amplitude, and BIASADJ,
SBIAS inputs control the bias current. Modulation
and bias current can be controlled by either voltage
or current through these pins. This device includes
three Operational Amplifiers and Laser Shutdown
function.
Features
• Maximum data rate (NRZ): 2.0Gbps (Typ.)
• Differential Data input: ECL
• On chip three Operational Amplifiers
• Laser Shutdown Input: TTL
CXB1548Q-Y
32 pin QFP (Ceramic)
Applications
• SONET/SDH: 155,622Mb/s,1.2Gb/s
• Fiber channel: 133,266,532Mb/s,1.062Gb/s
• FDDI: 125Mb/s ESCON: 200Mb/s HDTV: 1.5Gb/s
Absolute Maximum Ratings
• Supply voltage Vcc – VEE –0.3 to +7.0 V
• Input voltage VIN VEE to +0.5 V
• Differential input voltage |VIN – VIN| 0 to 2.5 V
• Output current (Continuous) IQ, IBIAS 0 to 80 mA
Input current (Continuous) IDRVADJ 0 to 8 mA
IBIASADJ 0 to 8 mA
• Storage temperature Tstg –65 to +150 °C
Recommended Operating Conditions
• DC power supply voltage Vcc – VEE 4.75 to 5.46 V
• Operating case temperature Tc 0 to +85 °C
Structure
Bipolar silicon monolithic IC
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
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E94721-PK
Block Diagram and Pin Assignment
CXB1548Q-Y
VEE1
BB
V
VCC1
DRIVADJ
CC2
V
LDOFF
23
24
25
VOLTAGE
SOURCE
BB)
(V
26
D
27
D
28
29
P
30
P
31
32
1
SDRIV
22
INPUT SIGNAL
MONITOR
2
3
EE2
V
IN3
IN3
21
MODULATION
GENERATOR
4
Q
Q
20
VOLTAGE
SOURCE
(V
OUT3
REF)
5
Q
IN2
19
18
BIAS
GENERATOR
6
7
Q
IN2
BIASB
17
8
BIASA
REF
V
16
15
14
13
12
11
10
9
OUT2
IN1
IN1
IGND
OUT1
BIASADJ
VEE2
SBIAS
Truth table
LDOFF
H
H
L
L
∗
In a case of resistor load
DQP
L
H
L
H
H
L
H
H
H
L
H
L
– 2 –
Pin Description
CXB1548Q-Y
Pin
No.
1
32
3
4
5
6
Symbol
SDRIV
DRIVADJ
Q
Q
BIASB7
BIASA8
Typical
Voltage (V)
DC AC
0mA to
∗1
8mA
0mA to
∗2
6mA
VEE to
VEE
+2.5V
–5.2V
—
—
0mA to
30mA
—
—
—
—VEE22, 10
0mA to
60mA
0mA to
40mA
0mA to
60mA
0mA to
40mA
—
∗1
∗2
∗1
∗2
32
10
Equivalent circuit Description
Modulation generator
3
current monitor.
Modulation generator
VCC
6
5
4
current adjustment.
Negative power supply
pin.
1
Modulation generator
2
7
8
VEE
current output.
Bias generator current
output.
VCC
SBIAS9
BIASADJ11
OUT112
IN114
IN115
OUT216
IN218
IN219
OUT320
IN321
IN322
IGND13
∗1
VEE = –5.46V to –4.94V
∗2
VEE = –4.94V to –4.75V
0mA to
8mA
VEE to
VEE
+2.5V
VEE
+0.7V
to –1.0V
open or
VEE
—
—
—
—
10
9
Bias generator current
monitor.
11
2
VEE
Bias generator current
adjustment.
Output pin for OpAmp.
15
14
19
18
22
IN
IN
21
13
12
OUT
16
20
Input pins for OpAmp.
Output pin for OpAmp.
Input pins for OpAmp.
Output pin for OpAmp.
Input pins for OpAmp.
OpAmp switch pin
IGND = VEE: active
IGND = OPEN: inactive
– 3 –
CXB1548Q-Y
Pin
No.
17
23
24
Symbol
VREF
LDOFF
VCC2
Typical
Voltage (V)
DC AC
VEE
+2.5V
open or
VEE.
0V
—
—
—
VREF
GEN
Equivalent circuit Description
VCC
17
Reference voltage
(VREF – VEE: 2.5V)
Max. drive current ±3mA
VEE
Shut down switch pin
LDOFF = L (VEE):
shut down
LDOFF = H (open):
Laser active
Positive Power supply
pin.
25
26
25
28
VEE1
VBB
VEE1
D27
D
–5.2V
–1.3V
–5.2V
—
—
—
—
–1.84V
to
–0.81V
29
27
28
900Ω
200Ω
200Ω
500µ
VCC
26
VEE
Negative Power supply
pin.
Reference voltage (–1.3V)
Use for the reference
voltage in the case of
single-phase input.
Max. drive current ±200µA
Negative power supply
pin.
VCC
Data signal input.
29
VCC1
0V
—
25
VEE
Positive power supply pin.
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