M66515FP Datasheet, PDF (1/7 Pages) Mitsubishi Electric Semiconductor – LASER-DIODE DRIVER/CONTROLLER

MITMSUITBSIUSBHIS〈HDIG〈DITIAGLITALSSAPS〉SP〉
M665M16565F1P5FP
LASLEARS-DEIRO-DDEIODDREIVDERRIV/CEORN/CTORNOTLRLOERLLER
DESCRIPTION
The M66515 is a semiconductor laser-diode driver/controller.
Its functions are the driving and laser power control of a spe-
cific type (Mitsubishi’s N type laser) of semiconductor laser
diode, in which the anode of a semiconductor laser diode is
connected in stem structure to the cathode of a monitoring
photodiode.
The IC has a laser drive current output pin of sink type and is
capable of driving a laser diode on a maximum bias current
of 30mA and a maximum switching current of 120mA, which
is switched at a rate of 40Mbit/s.
Since the M66515 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 internal APC function
• High speed switching (40Mbps)
• Large drive current (150mA max.)
• Capable of setting bias current (30mA max.)
• 5V single power supply
APPLICATION
Semiconductor laser-diode applied equipment
PIN CONFIGURATION (TOP VIEW)
OUTPUT TO SWITCHING
CURRENT SETTING LOAD
RS ← 1
GND1 2
OUTPUT TO BIAS CURR-
ENT SETTING LOAD
RB ← 3
BIAS CURRENT
SETTING VOLTAGE INPUT
VB → 4
REFERENCE VOLTAGE
OUTPUT
REFERENCE VOLTAGE INPUT
Vref ← 5
Vr → 6
HOLDING CAPACITANCE
LOAD INPUT/OUTPUT
CH ←→ 7
→ SAMPLE-HOLD CONTROL
INPUT
S/H
8
VCC1
9
TEST PIN TEST 10
20 VCC2
19 →RO
LASER CURRENT
LOAD OUTPUT
18 NC
17 →LD
LASER CURRENT
OUTPUT
16 GND2
15 ←PD
MONITORING DIODE
INPUT
14 ←DATA SWITCHING DATA INPUT
13 ←ENB
LASER CURRENT
ENABLE INPUT
12
11
←2RM
←1RM



MONITORING
INPUT
LOAD
Outline 20P2N-A
NC: No Connection
BLOCK DIAGRAM
REFERENCE
VOLTAGE INPUT Vr 6
SAMPLE-HOLD S/H 8
CONTROL INPUT
HOLDING CAPACITANCE
LOAD INPUT/OUTPUT CH 7
OUTPUT TO SWITCHING
CURRENT SETTING _{RS 1}
LOAD
BIAS CURRENT SETTING
VOLTAGE INPUT
VB 4
OUTPUT TO BIAS RB 3
CURRENT SETTING LOAD
MONITORING
LOAD INPUT
1RM
11
2RM
12
MONITORING
DIODE INPUT
PD
15
LASER CURRENT REFERENCE LASER CURRENT
OUTPUT VOLTAGE OUTPUT LOAD RESISTOR
LD
Vref
RO
17
5
19
DIFFRENTIAL AMP
SAMPLE-HOLD
CIRCUIT
REFERENCE
IPD
VOLTAGE SOURCE
(1.2V typ)
IB⁺ISW
CURRENT SWITCHING
CIRCUIT
IB
ISW
SWITCHING CURRENT
SOURCE (ISW)
120mA max.
BIAS CURRENT
SOURCE (IB)
30mA max.
VCC1, GND1: For analog circuits in IC
VCC2, GND2: For digital circuits in IC
14 DATA
SWITCHING
DATA INPUT
9 VCC1
20 VCC2
2 GND1
16 GND2
13 ENB
LASER CURRENT
ENABLE CONTROL
INPUT
1