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Laser Driver Ba
andwidt at Low Current Output
th w t t
Rev A. Nov 2012
The ana alog modulatio on bandwidth* of the LDC5
h 500, freq
quency responses for LDC
C500/501, an LDC502,
nd
LDC501 an nd LDC502 is s specified for o operation at 550% are shown in Figu
ures 1 and 2.
of full scalee DC output (5 50% FS). Whe en the DC currrent
setting is v
very low, say 2% FS, the baandwidth will be
l From the figu
F ure, when the current settin ng is above
lower. To a achieve higher r frequency m modulation at low 40% FS, the ba
% measured to be around
andwidth is m
DC bias, directly injecti ing RF curren into the la
nt aser 1MH For example, at low ra
Hz. ange on the LDC501, full
diode can be used, wh hich is descr ther
ribed in anot scal is 250mA. 40% FS gi
le ives 100mA. When the
application n note on our w website. currrent setting is
s only 2% FS,, or 5mA, the bandwidth
is around 150kHz z.
A serie of measur
es rements was performed on
s
several uni its of LDC500, , LDC501 and LDC502. Typ pical
*
fined as the