HFBR-1414TZ Avago Technologies US Inc., HFBR-1414TZ Datasheet - Page 11

• Manufacturer Part Number: HFBR-1414TZ
• Description: XMITTER FIBER OPTIC HIGH PWR ST
• Manufacturer: Avago Technologies US Inc.

Specifications of HFBR-1414TZ

• Wavelength: 820nm
• Voltage - Forward (vf) Typ: 1.7V
• Current - Dc Forward (if): 100mA
• Voltage - Dc Reverse (vr) (max): 1.8V
• Capacitance: 55pF
• Connector Type: ST
• Function: High performance fiber optic communication links for information systems and industrial applications.
• Product: Transmitter
• Data Rate: 160 MBd
• Diode Capacitance: 55 pF
• Maximum Rise Time: 6.5 ns
• Maximum Fall Time: 6.5 ns
• Pulse Width Distortion: 7.56 ns
• Operating Supply Voltage: 7 VDC
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Spectral Bandwidth: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With: Multimode Glass, Hard Clad Silica
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 516-2039

5 MBd Logic Link Design
If resistor R1 in Figure 2 is 70.4 Ω, a forward current I
of 48 mA is applied to the HFBR-14x4Z LED transmitter.
With I
guaranteed to work with 62.5/125 µm fiber optic cable
over the entire range of 0 to 1750 meters at a data
rate of dc to 5 MBd, with arbitrary data format and
pulse width distortion typically less than 25%. By
setting R
I
achieve lower pulse distortion.
The following example will illustrate the technique for
selecting the appropriate value of I
+5 V
NOTE:
IT IS ESSENTIAL THAT A BYPASS CAPACITOR (0.01 µF TO 0.1 µF
CERAMIC) BE CONNECTED FROM PIN 2 TO PIN 7 OF THE RECEIVER.
TOTAL LEAD LENGTH BETWEEN BOTH ENDS OF THE CAPACITOR
AND THE PINS SHOULD NOT EXCEED 20 MM.
Figure 2. Typical Circuit Configuration.
11
F
DATA IN
= 30 mA, if it is desired to economize on power or
1 K
SELECT R
F
= 48 mA the HFBR-14x4Z/24x2Z logic link is
½ 75451
1
R
R
R
1
1
= 115 Ω, the transmitter can be driven with
1
1
TO SET I
233
V
CC
I
I
F
F
F
V
2
6
7
3
F
TRANSMITTER
HFBR-14xxZ
5V
T
1.5V
15
mA
F
and R
1
.
TRANSMISSION
F
DISTANCE =
Maximum distance required = 400 meters. From Figure
3 the drive current should be 15 mA. From the
transmitter data V
shown in Figure 9.
The curves in Figures 3, 4, and 5 are constructed
assuming no inline splice or any additional system loss.
Should the link consists of any in-line splices, these
curves can still be used to calculate link limits provided
they are shifted by the additional system loss expressed
in dB. For example, Figure 3 indicates that with 48 mA
of transmitter drive current, a 1.75 km link distance is
achievable with 62.5/125 µm fiber which has a
maximum attenuation of 4 dB/km. With 2 dB of
additional system loss, a 1.25 km link distance is still
achievable.
F
= 1.5 V (max.) at I
HFBR-24x2Z
RECEIVER
R
7 & 3
2
6
F
= 15 mA as
TTL DATA OUT
R
L
0.1 µF
V
CC