M61880FP Datasheet, PDF (1/11 Pages) Mitsubishi Electric Semiconductor – Laser-diode driver / controller

MITSUBISHI < DIGITAL ASSP >
M61880FP
Laser-diode driver / controller
DESCRIPTION
The M61880FP is a semiconductor laser-diode driver/
controller. Its functions are the driving and laser power
control of a specific 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 40mA and a maximum switching current of 100
mA,which is switching at a rate of 200Mbps.
Since the M61880FP has a built in sample-hold circuit,it is
possible to realize an internal APC* system that requires
no external device for laser power control.
*:Automatic Power Control
FEATURES
Built-in sample-hold circuit for internal APC function
Hold error voltage is less than 1% for 1µs(C=0.047µF)
High speed switching 200Mbps
Large driving current 100mA (max)
Capable of setting bias current (40mA max)
5V single power supply
APPLICATION
Semiconductor laser-diode applied equipment
Laser beam printer(LBP)
Plain Paper Copier(PPC)
PIN CONFIGURATION (TOP VIEW)
OUTPUT TO SWITCHING
CURRENT SETTING LOAD
RS
1
GND1 2
OUTPUT TO BIAS CURRENT _RB
3
SETTING LOAD
BIAS CURRENT SETTING
VOLTAGE INPUT
VB
4
REFERENCE VOLTAGE
OUTPUT
Vref
5
REFERENCE VOLTAGE
INPUT
Vr
6
HOLDING CAPACITOR
LOAD INPUT/OUTPUT
CH
7
SAMPLE-HOLD
CONTROL INPUT
S/H 8
Vcc1 ⁹
NC ¹⁰
20 _Vcc2
19
RO
LASER CURRENT
LOAD OUTPUT
18 N C
17
LD
LASER CURRENT
OUTPUT
16 GND2
15
PD
MONITORING
DIODE INPUT
14
DATA ^SWITCHING
DATA INPUT
13 ENB ^{LASER CURRENT}
ENABLE INPUT
12 2RM ^MONITORING
LOAD INPUT 2
11 1RM ^MONITORING
LOAD INPUT 1
NC : No connection
Outline 20P2N-A
BLOCK DIAGRAM
Vcc2 RO N C LD GND2 PD _{DATA ENB} 2RM 1RM
20
19
18
17
16
15
14
13
12
11
+
TTL/ECL
ISW
COMP
IB
1
2
3
RS GND1 RB
2.5V
50K
Reference
voltage
1.5V
4
5
6
7
VB Vref Vr
8
9
10
S/H Vcc1 NC
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