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M61880FP 반도체 회로 부품 판매점

Laser-diode driver / controller



Mitsubishi 로고
Mitsubishi
M61880FP 데이터시트, 핀배열, 회로
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
SETTING LOAD
BIAS CURRENT SETTING
VOLTAGE INPUT
VB
REFERENCE VOLTAGE
OUTPUT
Vref
REFERENCE VOLTAGE
INPUT
Vr
3
4
5
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 23
RS GND1 RB
2.5V
50K
Reference
voltage
1.5V
4 56
VB Vref Vr
7
8 9 10
S/H Vcc1 NC
( 1 / 11)


M61880FP 데이터시트, 핀배열, 회로
MITSUBISHI < DIGITAL ASSP >
M61880FP
Laser-diode driver / controller
FUNCTIONS
erating a potential difference (Vm). Vm is compared with the
The M61880 is a semiconductor laser-diode driver/controller. voltage applied to the Vr pin. If Vm < Vr , a constant current is
Its functions are the driving and laser power control of a spe- sourced through the CH pin so that the external capacitor is
cific type (Mitsubishi's N type laser) of semiconductor laser charged. If Vm > Vr , a constant current sinks through the CH
diode , in which the anode of a semiconductor laser diode pin to discharge the external capacitor.
(LD) is connected in stem structure to the cathode of a moni- The above operation occurs when the S/H input is "L" and
toring photodiode (PD).
DATA = "L" (sample).When the S/H input is "H" , the CH pin
The functions to drive LD and to control laser power are car- is maintained at high impedance state (hold) , irrespective of
ried out by connecting an external capacitor to the CH pin and the state of Vm , Vr , and DATA input.
applying a reference voltage to the Vr pin.
The LD drive current is made up of the switching current, lsw,
The PD current generated by LD illumination flows through which is controlled by the DATA input, and IB , which is the
the resistor connected between 1RM and 2RM , thereby gen- bias current to LD independent of the state of the DATA input.
PIN DESCRIPTIONS
Pin Name
LD Laser current output
PD Monitoring diode input
Switching current
Rs Set load output
Description
Connect to cathode on semiconductor laser diode.
Connect to anode on monitoring photodiode.
Connect a load resistor between this pin and GND for the setting of current (lsw)
to be switched.
RB
Bias current
Set load output
Connect a load resistor between this pin and GND for the setting of bias current
(IB). Leave this pin open if IB is not used.
Bias current setting
Bias current (IB) is set by applying a voltage at this pin. Leave this pin open if IB
VB voltage input
is not used.
DATA
Switching data input
If this pin is "L" ,a current of Isw+IB flows through laser diode, if "H" , current
IB flows.
1RM,2RM
For monitoring
Load input
A load resistor is connected between pins 1RM and 2RM for conversion of
current generated by monitoring photodiode into changes in voltage.
( 2RM pin connects to GND in the IC.)
ENB
RO
Laser current enable input If this pin is "H" all current source circuits are turned off.
Laser current load output Connect a laser current load resistor between this pin and Vcc.
S/H Sample hold control input If this pin is "L" ,sampling (APC) occurs, if "H" ,holding (switching).
CH
Holding capacitor load
input/output
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Vref Reference voltage output Internal reference voltage (1.5Vtyp.) output pin of M61880.
A reference voltage is applied to this pin to operate the comparator in the
Vr Reference voltage input sample-hold circuit. Connect this pin to the Vref pin if the internal reference
voltage of the M61880 is to be used.
Vcc1
Vcc2
Power supply pin 1
Power supply pin 2
Power supply to internal analog circuits. Connect to a positive power source(+5V).
Power supply to internal digital circuits. Connect to a positive power source(+5V).
GND1
GND2
GND pin 1
GND pin 2
GND for internal analog circuits.
GND for internal digital circuits.
( 2 / 11 )




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M61880FP diode

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M61880FP

Laser-diode driver / controller - Mitsubishi