GN8062 Datasheet, PDF (3/3 Pages) Panasonic Semiconductor – GaAs IC

GaAs MMICs
s Block Diagram
INSIDE GN8062
VDD
VIN
VSS
VSS
VDD
OUTSIDE GN8062
+5V
LASER DIODE
OUT
GN8062
VSS
VIP
VSS
GND 1
8
VSS
NC 2
7
VIN
NC 3
OUT ⁴
6
VDD
5
VIP
from CONTROL
CIRCUIT
s Caution for Handling
1) The recommended V_IN voltage is 2.5 to 3V for [H] and
0 to 0.4V for [L].
2) Do not apply V_IN while the power supply is OFF.
3) For the current source to be connected to the V_IP pin,
use a Si bipolar transistor as shown in the circuit dia-
gram.
MA3068(VZ=6.8V,Cd=85pF,RZ=6Ω)
(Example: 2SD874)
To connect a resistor to the emitter or collector, use a
resistor of a few ohm. The use of higher resistor may
cause large change in the voltage at the V_IP pin, and
may make the output waveform distortion. (See the pulse
output current control example).
To use another current control circuit, set so that the V_IP
pin voltage becomes around 2V.
GN8062
GND VSS
–5.0V
NC VIN
200Ω to 2kΩ
50Ω
NC VDD
5.0V
OUT VIP
4) When mounting, minimize the connection distance be-
tween the semiconductor laser and IC, and use the chip
Connection example of pin protection circuit
parts (C, R) of less parasitic effects.
5) Attention to damage by the power surge (see the ex-
ample connection of the pin protection circuit).
During handling, take care to ground the human body
and solder iron tip.
6) When the power supply is turned ON and OFF, set the
current value of the current source connected to the V_IP
pin to zero. This is important to prevent the large cur-
rent flow through the semiconductor laser during power
GN8062
GND VSS
NC VIN
NC VDD
OUT VIP
–+
IB
0.22mF
I COLLECTOR
ON/OFF.
When the power supply is ON, be sure to turn ON V_DD,
5Ω
after V_SS is completely equal to – 5V. When the power
supply is OFF, be sure to turn OFF V_SS, after V_DD is
completely 0V.
VEE=–5 to 0V
Example of pulse output current control circuit
7) Pay attention to release the heat.