IC-VJ Datasheet, PDF (2/10 Pages) IC-Haus GmbH – LASER DIODE CONTROLLER

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
AMD
2
KLD
3
GND
4
MI
5
R
6
RC
7
AGND
8
n.c.
16
n.c.
15
NPRF
14
PRF
13
MO
12
VCC
11
ISET
10
n.c.
9
CI
PIN FUNCTIONS
No. Name Function
1 AMD Anode Monitor Diode
2 KLD Cathode Laser Diode
3 GND Ground
4 MI Monitor Current Output
5R
Oscillator Resistor
6 RC Oscillator Capacitor
7 AGND Analogue Ground
8 n.c.
9 CI Averaging Capacitor
10 n.c.
11 ISET Set-up Resistor for the
Laser Diode Power
12 VCC 5 V Supply Voltage
13 MO Monitor Voltage Output
14 PRF Pulse Repetition Frequency Output
15 NPRF Inverted PRF
16 n.c.