MITSUBISHI 〈DIGITAL ASSP〉
M66510P/FP
LASER-DIODE DRIVER
EVALUATION OF SWITCHING OPERATION WAVEFORM
Connector
0.1mF
VCC 1
GND 2
VL1 3
VL2 4
VOFF 5
GND 6
CO 7
MO 8
22mF
1 VCC1
2 VL1
RC1
680Ω
3 1RC
4 VL2
RC2
680Ω
JP RC3
(Open) 390Ω
5 2RC
6 VOFF
7 3RC
8 GND1
DATA 9
PD 10
9 1RM
RM
3kΩ
10 2RM
1RO 20
2RO 19
LD 18
GND 17
PD 16
DATA 15
VCC2 14
CO 13
MO 12
CD 11
91pF
RO
12Ω
(V) (V)
RLD CLD
500Ω 75pF
VCC = 5V
Ta = 25°C
Laser beam
output
Laser power
meter
0.1
mF
ML4403R
Directly mounted on 50Ω
PC board
Oscilloscope
(laser beam output)
P.G. (Note 9)
50Ω
Oscilloscope (data input)
V : The RLD and CLD optimum values depend on
a type of laser used and a PCB pattern.
Note 9: tr = tf = 6ns, VO = 3Vp-p, duty = 50%
SWITCHING OPERATION WAVEFORM
DATA input
(2V/div)
Laser beam output
(1mW/div)
3V
0V
3mW
0mW
EVALUATION CIRCUIT
2Mbit/s (t: 200ns/div)
5Mbit/s (t: 100ns/div)
10Mbit/s (t: 50ns/div)
20Mbit/s (t: 20ns/div)
Note: The delay from DATA input to laser beam output includes a measurement delay.
10