iC-VJ, iC-VJZ
LASER DIODE CONTROLLER
Rev A1, Page 2/10
DESCRIPTION
The devices iC-VJ and iC-VJZ are control ICs for
laser diodes. Control to the average of the laser cur-
rent and integrated protective functions ensure save
operation of the sensitive semiconductor laser. All re-
quired functions for the pulse operation of a CW laser
are integrated: a power driver and monitor amplifier
for direct connection of the laser diode, an oscillator
for pulse repetition frequency generation, a start-up
and temperature protection as well as monitor and
pulse repetition frequency outputs for synchronous
control of a receiver circuit.
The laser power control is adapted to the laser diode
used with an external resistor at ISET. The capacitor
at CI determines the control time constants.
The oscillator operates with an external RC circuit in
the range from about 10 kHz to 4 kMHz. The gener-
ated pulse duty factor is a stable 1:1; the oscillator
frequency is reduced to 1/16
th
by the integrated di-
vider.
An image of the laser diode current is output via
MI. Output MI when connected with a low pass fil-
ter forms a voltage proportional to the average laser
current. This voltage is output to MO via the inte-
grated voltage follower and is thus available for any
applications. The Outputs PRF and NPRF supply the
pulse repetition frequency complementarily to ana-
logue levels (VCC / 2 ±0.75 V
pk
) to be able to activate
high-speed ECL logic of a receiver circuit.
The IC contains protective diodes against ESD de-
struction, a thermal shutdown, plus a start-up circuit
for the laser diode driver to protect the laser diode
when the supply voltage is switched on.
PACKAGES
SO16N to JEDEC Standard
PIN CONFIGURATION SO16N
(top view)
1
16
PIN FUNCTIONS
No. Name Function
n.c.
AMD
2
15
KLD
3
NPRF
14
GND
4
PRF
13
MI
5
MO
12
R
6
VCC
11
RC
7
ISET
10
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
AMD
KLD
GND
MI
R
RC
AGND
n.c.
CI
n.c.
ISET
Anode Monitor Diode
Cathode Laser Diode
Ground
Monitor Current Output
Oscillator Resistor
Oscillator Capacitor
Analogue Ground
Averaging Capacitor
iC−VJ# Code...
...
...yyww
AGND
8
9
n.c.
CI
n.c.
Set-up Resistor for the
Laser Diode Power
VCC 5 V Supply Voltage
MO
Monitor Voltage Output
PRF Pulse Repetition Frequency Output
NPRF Inverted PRF
n.c.
ICHAUS [ IC-HAUS GMBH ]
