IC-WJBEVALWJ1D ICHAUS [IC-Haus GmbH], IC-WJBEVALWJ1D Datasheet - Page 10

no-image

IC-WJBEVALWJ1D

Manufacturer Part Number
IC-WJBEVALWJ1D
Description
2.7 V LASER DIODE DRIVER
Manufacturer
ICHAUS [IC-Haus GmbH]
Datasheet
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 = R3 =
15 k the cut-off frequency is approx. 30 kHz, with CI =
22 nF and the same resitor value of about 150 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 purpose. The following figures show
DEMO BOARD
iC-WJB
2.7 V LASER DIODE DRIVER
VMOD
0..1.3V
CI
22nF
RSET
27kΩ
R3
27kΩ
3
4
1
2
GND
Figure 11: Analogue modulation during CW operation
CI
CWD
ISET
WDOG
REF
iC−WJB
VCC
KLD
AMD
IN
8
7
6
5
2.7..6V
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.
R1
100nF
0..2Ω
C2
C1
47uF
C3
2nF
Rev E1, Page 10/12
LD
MD

Related parts for IC-WJBEVALWJ1D