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SFP Module Reference Design

SFP_SY84782U_R0

Preliminary

Micrel Inc. • 2180 Fortune Drive • Jose, CA 95131 • USA • tel +1 (408) 944 0800 • fax + 1 (408) 474 1000 • San - - http://www.micrel.com

March 19, 2015

Preliminary

General Description

This evaluation board is a complete SFP module as

dened in the SFP MSA document. The design uses

Micrel’s MIC3003 controller, the 1 G DFB/FP laser .25

driver SY84782U, and any of the SY84113U iting lim

amplier A picture of the fully loaded board is shown on .

the next page.

Datasheets and support documentation are available on

Micrel’s web site at: . www.micrel.com

Related Support Documentation

 MIC3003 datasheet: Fibre optic module controller

featuring digital diagnostic monitoring interface, as per

SFF-8472/SFF-8432, with internal/external calibration

and full laser control with bias and modulation current

compensation for temperature variations using lookup

tables.

 84782U datasheet. SY .

 SY84113U datasheet. . .

 MIC3003 software user’s guide.

Features

 Compliant with SFP MSA

 Allows for easy and fast evaluation of Micrel’s chipset

for low power SFP module

 Multi-rate operation up to 1.25Gbps

 Single, power supply: 2.5V or 3.3V

 Extended temperature range: -40°C to +9 5°C

Transmitter FP/DFP Laser Diode Driver –

 Operates from a single 2.5V or 3.3V supply

 Modulation current up to 80mA

 C be DC or AC coupled to the laser an

 Small form factor 3mm x 3mm QFN package

Receiver Limiting Post Amplier –

 Wide dierential input range (5mVPP 1800to mVPP)

 Wide SD de-assert or LOS assert threshold range

3mVPP to 30mVPP with 4dB typical electrical hysteresis

 Fast SD / LOS assert/de-assert time

 Available in a tiny 3mm x 3mm QFN package

Controller

 Extensive temperature range

 Alarms and warnings interrupt and TXFAULT masks

 Capability to support up to four chips on the serial

interface

 Integrated digital temperature sensor

 Temperature compensation of modulation, bias, and

fault levels via NVRAM lookup tables

 User-writeable EEPROM scratchpad

 Option to be used with Cisco security chip

 Diagnostic monitoring interface per SFF-8472/8432

 Space saving 3mmx3mm package available

(MIC3003GFL)

Micrel, Inc.

SFP_SY84782U Reference Design

March , 2015 17

Preliminary

Evaluation Board

TOSA

SY84113U ROSA

Top Side

MIC3003 Boom Side

SY84782U

Evaluation Board Setup

TOSA and ROSA Installation

Check the pin conguration of the TOSA and ROSA and

install them according to the diagrams shown in Figure 1.

Driver Laser Coupling

The laser is AC-coupled to the driver. Compensation for

laser parasitics can be improved by choosing appropriate

values for R6 and C15 (or R6 and C7) T. he laser’s

response can be improved by tuning, in addition to

R6/C15, R2 and R4/R13/L3. The optimal values of /R3/L2

these components depend on the length of the laser leads

and can vary from one family of lasers to another. It’s up to

the user to tune the values in order to achieve the best

compensation for the laser used with this board.

Receiver Sensitivity and Hysteresis Setting

The limiting amplier has a receive signal LOS/SD

indicator. The LOS/SD sensitivity is set by the voltage at

SD/LOSLVL (pin ) adjusted by the value of R , which 14 16

forms a voltage divider with the 2.8k internal resistor Ω

terminated to VCC-1.3V.

TOSA Anode (Top)

TOSA PD Anode (Top)

TOSA Cathode (Top)

ROSA VOUT+ (Top)

ROSA GND (Top)

ROSA VOUT- (Top)

TOSA GND (Bottom)

ROSA RSSI (Bottom)

ROSA VDD (Bottom)

Figure 1 Mounting of TOSA and ROSA .

Micrel, Inc.

SFP_SY84782U Reference Design

March , 2015 17

Preliminary

Setup and Operation

1. Set the desired frequency on a pattern generator with

amplitude between 200mVPP and 1800mVPP. Typical

data patterns are 27-1 or 223-1 PRBS patterns,

depending on the application. Because the inputs to

the board are AC-coupled, the voltage oset of the

pattern generator is not signicant, so it can be set

between GND and VCC.

2. Connect the pattern generator with dierential outputs

as a data source to the TXIN+ and TXIN- inputs on the

host board. Use matched length dierential cables.

3. Connect the USB plug-in of the host board to the USB

port of the computer.

4. Connect the 3.3V red post on the host board to the

output of the 3.3V power supply and the black post to

the GND and install a jumper between pin 2 and pin 3

of SW1.

5. Plug the SFP module into the host board connector

and connect the laser to the optical plug- of the in

scope.

6. Turn on the power supply.

7. Launch the MIC3003 software, select the serial

address of the device to be scanned (A0 is the default

address), and then click initialization. The main

window will open.

8. Memory content can be read and/or modied on the

panels or by accessing the registers directly by

selecting , enter the serial address ALL REGISTERS

and register address, then select to read the GET

content or enter a new value, and select SET NEW to

write. In this procedure, the bits are set on the panels.

9. Refer to the MIC3003 Software User’s Guide for the

detailed settings and illustrations.

10. and On the list, select Panels OEM CONFIG 3-4

select EXTERNAL CALIBRATION (default setting),

LOS COMPARATOR ENABLE SHDN RXLUT , ,

INPUT TEMPERATURE RSOUT, and . If needed, later

set to a dierent value to speed up the APC ISTART

loop during laser turn ON after a FAULT occurrence.

Close this window to return to the main window.

11. On the list, select Calibration EXTERNAL

CALIBRATION OFFSETS. Set all the to 0 and

SLOPES RXPWR RX_PWR(1) to 1. For , set only to 1.

These parameters might need to be changed later to

correct the measured values (calibration). Close this

window to return to the main window.

12. On the list, select to open Panels OEM CONFIG 0-2

the OEM conguration windows for registers 0, 1, and

2. Check the default setting of each and reset the

parameters to the correct values (below) if needed.

a. In the OEM Configuration Register 0 window, set

ENABLE/DISABLE to DISABLE, and set VMOD

REFERENCE to GND.

b. In the OEM Configuration Register 1 window, set

APC OP-AMP TYPE to EMITTER FOLLOWER,

select the voltage to report VINH:VINL, and set the

feedback voltage source to 1.22V. Also set

FEEDBACK BIAS REF RES TERMINATION and

to GND VBIAS DRIVE SOURCE and set to

(NPN). Set INTERNAL FEEDBACK RESISTOR

to INF.

c. In the OEM Configuration Register 2 window, the

MIC3003 address can be modied.

13. In the OEM Configuration Register 0 window, set

ENABLE/DISABLE ENABLE to .

14. On the list, select . Check and Panels User APCSET0

MODSET0 USER CONTROL REGISTER in the

(default setting). All the other parameters’ functionality

can be checked later. Return to the main window.

15. On the Panels list, select OEM Settings and enter the

following values:

a. Enter 255 for the IBIAS FAULT and TX PWR

FAULT thresholds.

b. Enter 0 for LOSS- -SIGNAL threshold and 0 for OF

FAULT SUPPRESSION TIMER.

c. Enter desired DAC values for bias and modulation

between 0 and 255.

Produktspecifikationer

Varumärke:	Microchip
Kategori:	Inte kategoriserad
Modell:	SY84113BU

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