iC-HG
3 A LASER SWITCH
Rev A2, Page 11/21
LASER OUTPUTS LDK1. . . 6
LDK1. . . 6 are the current pins for the laser diode cath- tance. It may still be necessary though to use an RC
ode. For high speed operation connect the laser diode snubber network for damping LC oscillations.
as close as possible to this pins to minimize the induc-
ANALOG GROUNDS AGND1. . . 6
AGND1. . . 6 are the ground pins for the channels. It is
recommended to connect all AGND1. . . 6 pins to GND.
ERROR OUTPUT NER
The open drain NER pin is a low-active error output.
Signalled errors are ELVDS open or at 50% VDD, VDD
undervoltage and thermal shutdown.
THERMAL SHUTDOWN
iC-HG is protected by an integrated thermal shutdown laser may be to also disable any external control cir-
feature. When the shutdown temperature is reached cuits for the laser output power or current control dur-
all channels are disabled. Falling temperature after ing thermal shutdown. The error signal at pin NER can
this shutdown will unconditionally enable all channels be used to e.g. disable the control circuit.
again. Necessary precaution to prevent damage of the
ICHAUS [ IC-HAUS GMBH ]
