MITSUBISHI
〈DIGITAL
ASSP〉
MITSUBISHI
〈DIGITAL
ASSP〉
M66512P/FP
M66512P/FP
LASER-DIODE DRIVER
LASER-DIODE DRIVER
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 volt-
age from an external source. the M66512 is capable of driv-
ing 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.
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
APPLICATION
Laser beam printers
PIN CONFIGURATION (TOP VIEW)
V
CC1
CURRENT SETTING INPUT 1
V
L1
CURRENT SETTING LOAD OUTPUT 1
1RC
CURRENT SETTING INPUT 2
V
L2
CURRENT SETTING LOAD OUTPUT 2
2RC
LASER CURRENT
FORCED OFF INPUT
V
OFF
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
20
19
18
17
16
15
14
13
12
11
RO
LOAD OUTPUT
NC
LD
LASER DIODE OUTPUT
GND2
PD
MONITORING DIODE INPUT
DATA
DATA INPUT
V
CC2
MONITORING
CO
COMPARATOR OUTPUT
MO
MONITORING ANALOG
OUTPUT
NC
LASER CURRENT
Outline 20P4
20P2N-A
NC: No Connection
M66512P/FP
BLOCK DIAGRAM
MONITORING
OUTPUT
MO
12
Linear amp
COMPARATOR
OUTPUT
CO
13
Comparator
(Vref=1.4V)
PD
16
LD
18
RO
20
1RM 9
2RM 10
V
L1
2
1RC 3
V
L2
4
2RC 5
Differential
amp
Current switching circuit
15 DATA
DATA INPUT
I
L
=I
L1
+I
L2
+I
L3
Constant current
source(I
L1
)
Max.60mA
Constant current
source(I
L2
)
Max.30mA
Constant current
source(I
L3
)
Max.30mA
6 V
OFF
LASER CURRENT
FORCED OFF
1 V
CC1
14 V
CC2
8 GND
1
17 GND
2
3RC 7
V
L1
, 1RC : Laser current (I
L1
) setting pin
V
L2
, 2RC : Laser current (I
L2
) setting pin
3RC : Laser current (I
L3
) setting pin
V
CC1
, GND1 : Power supply pin for analog circuits in IC
V
CC2
, GND2 : Power supply pin for digital circuits in IC
1
MITSUBISHI [ MITSUBISHI ELECTRIC SEMICONDUCTOR ]
