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參數(shù)資料
| 型號(hào)： | M61880FP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Laser-diode driver / controller |
| 中文描述： | 激光二極管驅(qū)動(dòng)器/控制器 |
| 文件頁(yè)數(shù)： | 2/11頁(yè) |
| 文件大小： | 160K |
| 代理商： | M61880FP |
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2
MITSUBISHI
<
DIGITAL ASSP
>
M61880FP
Laser-diode driver / controller
FUNCTIONS
The M61880 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
(LD) is connected in stem structure to the cathode of a moni-
toring photodiode (PD).
The functions to drive LD and to control laser power are car-
ried out by connecting an external capacitor to the C
H
pin and
applying a reference voltage to the Vr pin.
The PD current generated by LD illumination flows through
the resistor connected between 1RM and 2RM , thereby gen-
PIN DESCRIPTIONS
CoConnect a holding capacitor between this pin and GND. Inside the M61880
thisthis pin connects to the output of the sample-hold circuit and the current source
inp input for Isw.
Pin
Name
Description
LD
PD
DATA
1RM,2RM
ENB
RO
S/H
GND1
GND2
Vr
Laser current output
Connect to cathode on semiconductor laser diode.
Monitoring diode input
Connect to anode on monitoring photodiode.
Switching current
Set load output
Connect a load resistor between this pin and GND for the setting of current (lsw)
to be switched.
Bias current
Set load output
Connect a load resistor between this pin and GND for the setting of bias current
(I
B
). Leave this pin open if I
B
is not used.
Bias current setting
voltage input
Bias current (I
B
) is set by applying a voltage at this pin. Leave this pin open if I
B
is not used.
Switching data input
If this pin is "L" ,a current of Isw+I
B
flows through laser diode, if "H" , current
I
B
flows.
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.)
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.
Sample hold control input
If this pin is "L" ,sampling (APC) occurs, if "H" ,holding (switching).
Holding capacitor load
input/output
Reference voltage output
Internal reference voltage (1.5Vtyp.) output pin of M61880.
Reference voltage input
A reference voltage is applied to this pin to operate the comparator in the
sample-hold circuit. Connect this pin to the Vref pin if the internal reference
voltage of the M61880 is to be used.
Vcc1
Power supply pin 1
Power supply to internal analog circuits. Connect to a positive power source(+5V).
Vcc2
Power supply pin 2
Power supply to internal digital circuits. Connect to a positive power source(+5V).
GND pin 1
GND for internal analog circuits.
GND pin 2
GND for internal digital circuits.
Vref
C
H
V
B
R
B
Rs
erating a potential difference (Vm). Vm is compared with the
voltage applied to the Vr pin. If Vm < Vr , a constant current is
sourced through the C
H
pin so that the external capacitor is
charged. If Vm > Vr , a constant current sinks through the C
H
pin to discharge the external capacitor.
The above operation occurs when the S/H input is "L" and
DATA = "L" (sample).When the S/H input is "H" , the C
H
pin
is maintained at high impedance state (hold) , irrespective of
the state of Vm , Vr , and DATA input.
The LD drive current is made up of the switching current, lsw,
which is controlled by the DATA input, and I
B
, which is the
bias current to LD independent of the state of the DATA input.
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