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PDF M66516FP Data sheet ( Hoja de datos )
| Número de pieza | M66516FP | |
| Descripción | LASER-DIODE DRIVER/CONTROLLER | |
| Fabricantes | Mitsubishi | |
| Logotipo |  |
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MITMSUITBSIUSBHIS〈HDIG〈DITIAGLITALSSAPS〉SP〉
M665M16665F1P6FP
DESCRIPTION
The M66516 is a semiconductor laser-diode driver/controller.
Its functions are the driving and laser power control of a spe-
cific type (Mitsubishi’s R type laser) of semiconductor laser
diode, in which the cathode of a semiconductor laser diode is
connected in stem structure to the anode of a monitoring
photodiode.
The IC has a laser drive current output pin of source type and
is capable of driving a laser diode on a maximum bias current
of 30mA and a maximum switching current of 120 mA, which
is switched at a rate of 20Mbits/sec.
Since the M66516 has a built in sample-hold circuit, it is pos-
sible to realize an internal APC∗ system that requires no ex-
ternal device for laser power control.
∗: Automatic Power Control
FEATURES
• Built-in sample-hold circuit for APC function
• High speed switching (20Mbps)
• Large drive current (150mA max.)
• Capable of setting bias current (30mA max.)
• 5V single power supply
APPLICATION
Semiconductor laser-diode applied equipment
LASLEARS-DEIRO-DDEIODDREIVDERRIV/CEORN/CTORNOTLRLOERLLER
PIN CONFIGURATION (TOP VIEW)
VCC1 1
→SWITCHING CURRENT
SETTING INPUT 1
VL1
←OUTPUT TO SWITCHING
CURRENT SETTING LOAD
1RC
→1
SWITCHING CURRENT
VL2
←SETTING INPUT 2
OUTPUT TO SWITCHING
2RC
→CURRENT SETTING LOAD
2
ENB
←LASER CURRENT
ENABLE INPUT
3RC
OUTPUT TO BIAS
CURRENT SETTING LOAD
GND1
1RM →
2
3
4
5
6
7
8
9
MONITORING LOAD 2RM→ 10
INPUTS MO← 11
MONITORING ANALOG
OUTPUT
MONITORING
COMPARATOR OUTPUT
CO← 12
24 → RO
23 → LD
22 NC
OUTPUT TO LASER
CURRENT LOAD
LASER CURRENT
OUTPUT
21 ← PD
MONITORING DIODE
INPUT
20 GND2
→19
Vref
REFERENCE VOLTAGE
OUTPUT
←18
Vr
REFERENCE VOLTAGE
INPUT
17
← DATA
SWITCHING
INPUT
DATA
16
CD
DUTY CONTROL
INPUT
15 VCC2
14
CSH
CONNECTION PIN FOR
SAMPLE-HOLD CAPACITOR
13 ← S/H
SAMPLE-HOLD
CONTROL INPUT
Outline 24P2N-B
NC: No Connection
BLOCK
DIAGRAM
MONITORING
COMPARATOR OUTPUT
CO
12
MONITORING
ANALOG OUTPUT
MO
11
REFERENCE
VOLTAGE OUTPUT
Vref
19
COMPARATOR
Vr 18
VL1 2
SWITCHING CURRENT VL2 4
SETTING INPUTS 1RC 3
2RC 5
LINEAR AMP
REFERENCE
VOLTAGE
SOURCE
SWITCHING
CURRENT
SOURCE
RO
24
3RC 7
BIAS CURRENT
SOURCE
1
VCC
15
8
GND
20
DIFFERENTIAL
AMP
SAMPLE-HOLD
CIRCUIT
CURRENT
SWITCHING
CIRCUIT
9 10 13
14
21 23
16
17 6
1RM 2RM S/H
CSH
PD
LD
CD
DATA
ENB
MONITORING SAMPLE-HOLD CONNECTION MONITORING OUTPUT TO DUTY CONTROL SWITCHING LASER CURRENT
LOAD INPTUT CONTROL INPUT PIN FOR DIODE INTPUT LASER
INPUT
DATA INPUT ENABLE INPUT
SAMPLE-HOLD
CURRENT LOAD
CAPACITOR
1
1 page  
MITSUBISHI 〈DIGITAL ASSP〉
M66516FP
LASER-DIODE DRIVER/CONTROLLER
(2) External voltage-applied APC circuit
The following figure is an example of APC circuit configura-
tion, in which voltages are applied from external sources to
the VL1 and VL2 input pins of the M66516. In this example, the
S/H input pin is connected to Vcc and the CSH pin is open.
The CO or MO output is used to monitor laser power for ad-
justment of external control voltage.
External control voltage 1
External control voltage 2
CO
12
Vr
18
2
VL1
3
1RC
VL2 4
5
2RC
7
3RC
8
1RM
10
2RM
MO
11
14
CSH
RM
Vref
19
M66516FP
13
S/H
20 23
PD LD
RO
24
16 17
CD DATA
91pF
6
ENB
Data stream
Control signal
(3) Peak-holding internal APC circuit
The following figure is a configuration example of peak-hold-
ing internal APC circuit. In this example, the S/H input pin is
connected to GND.
If laser power is lower than preset value, C1 is charged with
the current from the CSH output pin through D1. The charge
stored in C1 is discharged through R1 thereafter.
Vr 18
CO
12
VL1 2
3
1RC
VL2 4
5
2RC
7
3RC
9
1RM
10
2RM
RM
R1 C1
MO
11
14
CSH
R2
Vref
19
M66516FP
RO
24
13
S/H
21 23
PD LD
16
CD
91pF
17
DATA
6
ENB
Data stream
Control signal
C1, R1: Time constant components
R2: Pull–down resistor
(Used for establishing CSH line voltage in case that CSH is in high impedance condition.)
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet M66516FP.PDF ] | |
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