MITSUBISHI 〈DIGITAL ASSP〉
MITSUBISHI 〈DIGITAL ASSP〉
M66512P/FP
M66512P/FP
LASER-DIODE DRIVER
LASER-DIODE DRIVER
FEATURES
• Two kinds of outputs for monitoring laser power built in.
(comparator output and analog output)
• Pin provided for forced OFF of current circuit.
• High speed switching (40 Mbit/s)
• Large drive current (120mA max.)
• 5V single power supply
PIN CONFIGURATION (TOP VIEW)
VCC1
CURRENT SETTING INPUT 1 VL1
CURRENT SETTING LOAD OUTPUT 1 1RC
CURRENT SETTING INPUT 2 VL2
CURRENT SETTING LOAD OUTPUT 2 2RC
LASER CURRENT
FORCED OFF INPUT VOFF
CURRENT SETTING LOAD OUTPUT 3RC
GND1
MONITORING LOAD INPUT 1 1RM
MONITORING LOAD INPUT 2 2RM
1
2
3
4
5
6
7
8
9
10
M66512P/FP
DESCRIPTION
The M66512 is a semiconductor laser-diode driver for driving
a specific type* of semiconductor laser, in which the anode of
a semiconductor laser diode is connected in stem structure to
the cathode of a monitoring photodiode.
The amplitude of laser drive current is set by applying a voltage from an external source. the M66512 is capable of driving laser diodes on a maximum current of 120 mA.
It operates on a 5-V single power supply and switches laser
drive current at a rate of 40 Mbit/s.
*: The N type of Mitsubishi’s semiconductor lasers.
20
19
18
17
16
15
14
13
12
11
LASER CURRENT
RO LOAD OUTPUT
NC
LD LASER DIODE OUTPUT
GND2
PD MONITORING DIODE INPUT
DATA DATA INPUT
VCC2
MONITORING
CO COMPARATOR OUTPUT
MO MONITORING ANALOG
OUTPUT
NC
Outline 20P4
20P2N-A
APPLICATION
Laser beam printers
NC: No Connection
BLOCK DIAGRAM
MONITORING
OUTPUT
MO
12
2RM 10
13
Linear amp
1RM 9
COMPARATOR
OUTPUT
CO
Comparator
(Vref=1.4V)
PD
16
LD
18
RO
20
Current switching circuit
Differential
amp
15 DATA
DATA INPUT
IL=IL1+IL2+IL3
VL1 2
1RC 3
VL2 4
Constant current
source(IL1)
Max.60mA
2RC 5
Constant current
source(IL2)
Max.30mA
3RC 7
Constant current
source(IL3)
Max.30mA
6 VOFF
LASER CURRENT
FORCED OFF
1 VCC1
14 VCC2
VL1, 1RC : Laser current (IL1) setting pin
VL2, 2RC : Laser current (IL2) setting pin
3RC : Laser current (IL3) setting pin
8 GND1
17 GND2
VCC1, GND1 : Power supply pin for analog circuits in IC
VCC2, GND2 : Power supply pin for digital circuits in IC
1
