ic-wj iC-Haus, ic-wj Datasheet - Page 10

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ic-wj

Manufacturer Part Number
ic-wj
Description
Laser Diode Driver
Manufacturer
iC-Haus
Datasheet

Available stocks

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Part Number
Manufacturer
Quantity
Price
Part Number:
IC-WJ
Manufacturer:
ROHM
Quantity:
11 500
Analogue modulation during CW operation
The modulation cut-off frequency is determined by the
capacitor CI as well as by the operating point set with
the resistor RSET. With CI = 100 nF and RSET = R2 =
10 k
= 22 nF and the same resitor value of about 230 kHz.
The laser power can also be modulated by adapting a
current source, e.g. by using an operational amplifier
with a current output (OTA). To limit the current at pin
For the devices iC-WJ/WJZ/WJB a Demo Board is
available for test purposes. The following figures show
DEMO BOARD
iC-WJ, iC-WJZ
LASER DIODE DRIVER
VMOD
0..1.5 V
the cut-off frequency is approx. 40 kHz, with CI
10 kΩ
R2
22 nF
CI
Figure 11: Analogue modulation during CW operation
RSET
10 kΩ
1
2
3
4
GND
CI
CWD
ISET
iC−WJ/WJZ
WDOG
REF
2 nF
C3
AMD
VCC
KLD
ISET while turning on the power supply for the OTA cir-
cuitry, however, RSET should be connected to the OTA
output (instead of to GND). The maximum current pos-
sible at ISET must be taken into consideration when
dimensioning the capacitor CI.
PC board layout
The ground connections of the external components
CI, CWD and RSET have to be directly connected at
the IC with the GND terminal.
the schematic diagram and the component side of the
test PCB.
IN
5
8
7
6
LD
+5 V
12Ω
R1
100 nF
C2
MD
Rev C1, Page 10/12
100 uF
C1
+5 V

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