AFBR-5805ATZ 查看數據表（PDF） - Avago Technologies

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AFBR-5805ATZ

ATM Transceivers for SONET OC-3 / SDH STM-1 in Low Cost 1 x 9 Package Style

Avago Technologies 

Notes:

1. This is the maximum voltage that can be applied across the Differen-

tial Transmitter Data Inputs to prevent damage to the input ESD pro-

tection circuit.

2. The outputs are terminated with 50  connected to VCC -2 V.

3. The power supply current needed to operate the transmitter is pro-

vided to differential ECL circuitry. This circuitry maintains a nearly

constant current flow from the power supply. Constant current op-

eration helps to prevent unwanted electrical noise from being gen-

erated and conducted or emitted to neighboring circuitry.

4. This value is measured with the outputs terminated into 50

W connected to VCC - 2 V and an Input Optical Power level of

-14 dBm average.

5. The power dissipation value is the 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.

6. This value is measured with respect to VCC with the output termi-

nated into 50  connected to VCC - 2 V.

7. The output rise and fall times are measured between 20% and 80%

levels with the output connected to VCC -2 V through 50 .

8. These optical power values are measured with the following condi-

tions:

• The Beginning of Life (BOL) to the End of Life (EOL) optical

power degradation is typically 1.5 dB per the industry con-

vention for long wavelength LEDs. The actual degradation

observed in Avago Technologies’ 1300 nm LED products is

< 1 dB, as specified in this data sheet.

• Over the specified operating voltage and temperature ranges.

• With 25 MBd (12.5 MHz square-wave), input signal.

• At the end of one meter of noted optical fiber with cladding

modes removed.

The average power value can be converted to a peak power value by

adding 3 dB.

9. The Extinction Ratio is a measure of the modulation depth of

the optical signal. The data “1” output optical power is com-

pared to the data “0” peak output optical power and expressed

in decibels. With the transmitter driven by a 25 MBd (12.5 MHz

square-wave) input signal, the average optical power is mea-

sured. 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 “1” level compared to the optical

power at the “0” level expressed in decibels.

10. The transmitter will provide this low level of Output Optical Power

when driven by a logic “0” input. This can be useful in link trouble-

shooting.

11. The relationship between Full Width Half Maximum and RMS values

for Spectral Width is derived from the assumption of a Gaussian

shaped spectrum which results in a 2.35 X RMS = FWHM relation-

ship. The optical rise and fall times are measured from 10% to 90%

when the transmitter is driven by a 25 MBd (12.5 MHz square-wave)

input signal. The ANSI T1E1.2 committee has designated the pos-

sibility of defining an eye pattern mask for the transmitter optical

output as an item for further study. Avago Technologies will incor-

porate this requirement into the specifications for these products if

it is defined. The AFBR-5805 products typically comply with the tem-

plate requirements of CCITT (now ITU-T) G.957 Section 3.2.5, Figure

2 for the STM-1 rate, excluding the optical receiver filter normally

associated with single mode fiber measurements which is the likely

source for the ANSI T1E1.2 committee to follow in this matter.

12. Systematic Jitter contributed by the transmitter is defined as the

combination of Duty Cycle Distortion and Data Dependent Jitter.

Systematic Jitter is measured at 50% threshold using a 155.52 MBd

(77.5 MHz square-wave), 27 -1 psuedo random data pattern input

signal.

13. Random Jitter contributed by the transmitter is specified with a

155.52 MBd (77.5 MHz square-wave) input signal.

14. This specification is intended to indicate 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 1 x 10-10.

• At the Beginning of Life (BOL)

• Over the specified operating temperature and voltage ranges

• Input is a 155.52 MBd, 223 - 1 PRBS data pattern with 72 “1”s and

72 “0”s inserted per the CCITT (now ITU-T) recommendation G.958

Appendix I.

• Receiver data window time-width is 1.23 ns or greater for the

clock recovery circuit to operate in. The actual test data window

time-width is set to simulate the effect of worst case optical input

jitter based on the transmitter jitter values from the specification

tables. The test window time-width is AFBR-5805 3.32 ns.

• Transmitter operating with a 155.52 MBd, 77.5 MHz square-wave,

input signal to simulate any cross-talk present between the trans-

mitter and receiver sections of the transceiver.

15. All conditions of Note 14 apply except that the measurement is

made at the center of the symbol with no window time-width.

16. Systematic Jitter contributed by the receiver is defined as the

combination of Duty Cycle Distortion and Data Dependent Jitter.

Systematic Jitter is measured at 50% threshold using a 155.52 MBd

(77.5 MHz square-wave), 27 - 1 psuedo random data pattern input

signal.

17. Random Jitter contributed by the receiver is specified with a 155.52

MBd (77.5 MHz square-wave) input signal.

18. This value is measured during the transition from low to high levels

of input optical power.

19. This value is measured during the transition from high to low levels

of input optical power.

20. The Signal Detect output shall be asserted within 100 μs after a step

increase of the Input Optical Power.

21. Signal detect output shall be de-asserted within 350 μs after a step

decrease in the Input Optical Power.

22. The AFBR-5805 transceiver complies with the requirements for the

trade-offs between center wavelength, spectral width, and rise/fall

times shown in Figure 9. This figure is derived from the FDDI PMD

standard (ISO/IEC 9314-3 : 1990 and ANSI X3.166 - 1990) per the de-

scription in ANSI T1E1.2 Revision 3. The interpretation of this figure is

that values of Center Wavelength and Spectral Width must lie along

the appropriate Optical Rise/Fall Time curve.

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