HFBR-5111 Agilent(Hewlett-Packard), HFBR-5111 Datasheet - Page 14

• Manufacturer Part Number: HFBR-5111
• Description: Low Cost/ Industry Standard FDDI MIC Transceivers
• Manufacturer: Agilent(Hewlett-Packard)

Notes:
10. Duty Cycle Distortion contributed by
1. This is the maximum voltage that can
2. The outputs are terminated with 50
3. The specified signaling rate of
4. The power supply current needed to
5. This value is measured with an output
6. This value is measured with the out-
7. The power dissipation value is the
8. This value is measured with respect to
9. The output rise and fall times are
be applied across the Differential
Transmitter Data Inputs to prevent
damage to the input ESD protection
circuit.
connected to V
10 MBd to 125 MBd guarantees
operation of the transmitter and
receiver link to the full conditions
listed in the FDDI Physical Layer
Medium Dependent standard.
Specifically, the link bit error ratio
will be equal to or better than
2.5 x 10
pattern. The transmitter section of
the link is capable of dc to 125 MBd.
The receiver is internally ac-coupled
which limits the lower signaling rate
to 10 MBd. For purposes of
definition, the symbol rate (Baud),
also called signaling rate, f
reciprocal of the shortest symbol
time. Data rate (bits/sec) is the
symbol rate divided by the encoding
factor used to encode the data
(symbols/bit).
operate the transmitter is provided to
differential ECL circuitry. This
circuitry maintains a nearly constant
current flow from the power supply.
Constant current operation helps to
prevent unwanted electrical noise
from being generated and conducted
or emitted to neighboring circuitry.
load R
puts terminated into 50
to V
Power level of -14 dBm average.
power dissipated in the receiver
itself. Power dissipation is calculated
as the sum of the products of supply
voltage and currents, minus the sum
of the products of the output voltages
and currents.
V
50
measured between 20% and 80%
levels with the output connected to
V
the receiver is measured at the 50%
threshold using an IDLE Line State,
125 MBd (62.5 MHz square-wave),
CC
CC
CC
- 2 V through 50
with the output terminated into
connected to V
L
- 2 V and an Input Optical
= 10 k .
-10
for any valid FDDI
CC
- 2 V.
CC
- 2 V.
.
connected
s
, is the
11. Data Dependent Jitter contributed by
12. Random Jitter contributed by the
13. These optical power values are
14. The Extinction Ratio is a measure of
• The Beginning of Life (BOL) to the
• Over the specified operation voltage
• With HALT Line State, (12.5 MHz
• At the end of one meter of noted
input signal. The input optical power
level is -20 dBm average. See
Application Information - Transmitter
Jitter Section for further information.
the receiver is specified with the
FDDI DDJ test pattern described in
the FDDI PMD Annex A.5. The input
optical power level is -20 dBm
average. See Application Information
- Transmitter Jitter Section for
further information.
receiver is specified with an IDLE
Line State, 125 Mbd (62.5 MHz
square-wave), input signal. The input
optical power level is at maximum
“P
Information - Transmitter Jitter
Section for further information.
measured with the following
conditions:
The average power value can be
converted to a peak power value by
adding 3 dB. Higher output optical
power transmitters are available on
special request.
the modulation depth of the optical
signal. The data “0” output optical
power is compared to the data “1”
peak output optical power and
expressed as a percentage. With the
transmitter driven by a HALT Line
State (12.5 MHz square-wave) signal,
the average optical power is
measured. The data “1” peak power is
then calculated by adding 3 dB to the
measured average optical power. The
data “0” output optical power is
found by measuring the optical power
when the transmitter is driven by a
logic “0” input. The extinction ratio is
the ratio of the optical power at the
“0” level compared to the optical
IN Min.
End of Life (EOL) optical power
degradation is typically 1.5 dB per
the industry convention for long
wavelength LEDs. The actual
degradation observed in Hewlett-
Packard’s 1300 nm LED products
is < 1 dB, as specified in this data
sheet.
and temperature ranges.
square-wave), input signal.
optical fiber with cladding modes
removed.
(W).” See Application
15. The transmitter provides compliance
16. This parameter complies with the
17. This parameter complies with the
18. Duty Cycle Distortion contributed by
19. Data Dependent Jitter contributed by
20. Random Jitter contributed by the
21. This specification is intended to indi-
power at the “1” level expressed as a
percentage or in decibels.
with the need for Transmit_Disable
commands from the FDDI SMT layer
by providing an Output Optical
Power level of < -45 dBm average in
response to a logic “0” input. This
specification applies to either
62.5/125 m or 50/125 m fiber
cables.
FDDI PMD requirements for the
tradeoffs between center wavelength,
spectral width, and rise/fall times
shown in Figure 9.
optical pulse envelope from the FDDI
PMD shown in Figure 10. The optical
rise and fall times are measured from
10% to 90% when the transmitter is
driven by the FDDI HALT Line State
(12.5 MHz square-wave) input signal.
the transmitter is measured at a 50%
threshold using an IDLE Line State,
125 MBd (62.5 MHz square-wave),
input signal. See Application Informa-
tion – Transceiver Jitter Performance
Section of this data sheet for further
details.
the transmitter is specified with the
FDDI test pattern described in FDDI
PMD Annex A.5. See Application
Information – Transceiver Jitter
Performance Section of this data
sheet for further details.
transmitter is specified with an IDLE
Line State, 1256 MBd (62.5 MHz
square-wave), input signal. See
Application Information – Trans-
ceiver Jitter Performance Section of
this data sheet for further details.
cate the performance of the receiver
section of the transceiver when Input
Optical Power signal characteristics
are present per the following
definitions. The Input Optical Power
dynamic range from the minimum
level (with a window time-width) to
the maximum level is the range over
which the receiver is guaranteed to
provide output data with a Bit Error
Ratio (BER) better than or equal to
2.5 x 10
• At the Beginning of Life (BOL).
• Over the specified operation
temperature and voltage ranges.
-10
.
105