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