SFP_022AL_R0 Reference Design
13, 2015 3 Revision 1.0
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 offset of the
pattern generator is not significant, so it can be set
between GND and VCC.
2. Connect the pattern generator with differential outputs
as a data source to the TXIN+ and TXIN- inputs on the
host board. Use matched length differential 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-in of the
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 modified on the
panels or by accessing the registers directly by
selecting ALL REGISTERS, enter the serial address
and register address, then select GET to read the
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. On the Panels list, select OEM CONFIG 3-4 and
select EXTERNAL CALIBRATION (default setting),
LOS COMPARATOR ENABLE, SHDN, RXLUT
INPUT TEMPERATURE, and RSOUT. If needed, later
set ISTART to a different value to speed up the APC
loop during laser turn ON after a FAULT occurrence.
Close this window to return to the main window.
11. On the Calibration list, select EXTERNAL
CALIBRATION. Set all the OFFSETS to 0 and
SLOPES to 1. For RXPWR, set only RX_PWR(1) 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 Panels list, select OEM CONFIG 0-2 to open
the OEM configuration 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 and RES TERMINATION
to GND and set VBIAS DRIVE to SOURCE
(NPN). Set INTERNAL FEEDBACK RESISTOR
to INF.
c. In the OEM Configuration Register 2 window, the
MIC3003 address can be modified.
13. In the OEM Configuration Register 0 window, set
ENABLE/DISABLE to ENABLE.
14. On the Panels list, select User. Check APCSET0 and
MODSET0 in the USER CONTROL REGISTER
(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-OF-SIGNAL threshold and 0 for
FAULT SUPPRESSION TIMER.
c. Enter desired DAC values for bias and modulation
between 0 and 255.
