HFBR-0410 Avago Technologies US Inc., HFBR-0410 Datasheet - Page 18

• Manufacturer Part Number: HFBR-0410
• Description: KIT EVAL FIBER OPTIC 5MBD
• Manufacturer: Avago Technologies US Inc.

Specifications of HFBR-0410

• Main Purpose: Interface, Fiber Optics
• Embedded: No
• Utilized Ic / Part: HFBR-1412, HFBR-2412
• Primary Attributes: DC ~ 5MBd TTL
• Secondary Attributes: ST Connectors
• Silicon Core Number: HFBR-1412, HFBR-2412
• Kit Contents: TX/RX Mods, Cable, Pol Kit, SW, Pwr. Sup
• Silicon Family Name: HFBR-0400
• Features: Dc To 5 MBd TTL Compatible Fiber Optic Component
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 516-2138; HFBR-0410

Recommended Drive Circuits
The circuit used to supply current to the LED transmitter
can significantly influence the optical switching charac-
teristics of the LED. The optical rise/fall times and propa-
gation delays can be improved by using the appropriate
circuit techniques. The LED drive circuit shown in Figure
11 uses frequency compensation to reduce the typical
rise/fall times of the LED and a small pre-bias voltage to
minimize propagation delay differences that cause pulse-
width distortion. The circuit will typically produce rise/fall
times of 3 ns, and a total jitter including pulse-width dis-
18
R
R
R
R
C(pF)
Example
V
Y
X1
EQ2
X2
F
All HFBR-14XXZ LED transmitters are classified as IEC 825-1 Accessible Emission Limit (AEL) Class 1 based upon the current
proposed draft scheduled to go in to effect on January 1, 1997. AEL Class 1 LED devices are considered eye safe. Contact your
Avago Technologies sales representative for more information.
CAUTION: The small junction sizes inherent to the design of these components increase the components’ susceptibility to
damage from electrostatic discharge (ESD). It is advised that normal static precautions be taken in handling and assembly of
these components to prevent damage and/or degradation which may be induced by ESD.
can
(V
=
=
(
CC
R
1
Ω
2
=
X3
be
(
)
-
2000
R
3.97
=
for
V
R
=
obtained
X1
R
F
Y
R
)
(
X1
X4
I
)
Ω
+
ps
F
-
=
3.97(V
)
ON
I
F
1
3(R
ON
=
from
100mA
(A)
EQ2
CC
)
-
Figure
V
F
:
-
1.6V)
( 9
=
1.84
V)
.
tortion of less than 1 ns. This circuit is recommended for
applications requiring low edge jitter or high-speed data
transmission at signal rates of up to 155 MBd. Component
values for this circuit can be calculated for different LED
drive currents using the equations shown below. For
additional details about LED drive circuits, the reader is
encouraged to read Avago Technologies Application Bul-
letin 78 and Application Note 1038.
R
R
R
R
R
C
Y
Y
X1
EQ2
X2
=
=
=
=
=
2000
11.8
=
(5
3.16
R
1
2
11.8
X3
(
-
0.100
93.5
3.97
1.84)
Ω
ps
=
+
1 -
R
6.19
=
X4
)
=
169
+
=
=
10.8
3.97(5
=
11.8
3
0.100
pF
93.5
(10.8)
Ω
Ω
-
Ω
1.84
=
32.4
-
1.6)
Ω