IC-HGP Datasheet, PDF (8/20 Pages) IC-Haus GmbH – 3A HIGH-SIDE LASER SWITCH

iC-HGP
3 A HIGH-SIDE LASER SWITCH
CONFIGURATION INPUT ELVDS
preliminary
Rev A1, Page 8/20
Pin ELVDS select between 6 channel TTL mode or 3
channel LVDS mode and chooses slow or fast switch-
ing speed. The unconnected pin ELVDS is an error
condition signaled at pin NER with the laser current
disabled.
Pin ELVDS connected to GND selects the six channel
fast TTL mode. Pin ELVDS connected to 30% VDD
selects the six channel slow TTL mode. Pin ELVDS
connected to 70% VDD selects the three channel slow
LVDS mode. Pin ELVDS connected to VDD selects the
three channel fast LVDS mode.
An easy way to set the slow operation mode for TTL
and LVDS mode is to connect a voltage divider at pin
ELVDS. Figure 1 shows the recommended voltage di-
vider for slow TTL mode and Figure 2 shows the rec-
ommended voltage divider for slow LVDS mode.
Figure 1: TTL Slow
Figure 2: LVDS Slow
DIGITAL INPUTS EN1...6
EN1...6 are the digital switching inputs. With pin ELVDS
set to 6 channel TTL mode, each pin ENx enables the
current source at the respective LDAx. With pin ELVDS
set to 3 channel LVDS mode, the odd ENx pins are the
positive and the even ENx pins are the negative LVDS
inputs:
For correct LVDS operation 100 Ω terminating resis-
tors between the respective ENx pins, very close to
the inputs, are strongly recommended. Input pins from
unused channels have to be connected to GND (TTL
operation) resp. even ENx pins to GND and odd ENx
pins to VDD (LVDS operation).
EN1 and EN2 control LDA1 and LDA2.
EN3 and EN4 control LDA3 and LDA4.
EN5 and EN6 control LDA5 and LDA6.