Receiver Output Amplitude and De-emphasis
Package Outline
Receiver outputs can be programmed to provide several
levels of amplitude and de-emphasis. See Figure 5 for de-
emphasis definition. The user can program for peak-to-
The module is designed to meet the package outline
defined in the PPOD MSA. This MSA follows the outline
of the SNAP12 MSA except for the position of the MEG-
peak amplitude and then a de-emphasis level. If zero de- Array® connector and pin assignments. See the package
emphasis is selected, then the signal steady state equals outline and host board footprint figures (Figures 23 -26)
the peak-to-peak level. For other levels of de-emphasis
the selected de-emphasis reduces the steady-state from
the peak-to-peak level. The change from peak-to-peak
level to steady-state occurs within a bit time. See Rx
Memory Map 01h Upper Page section addresses 228 - 233
for amplitude programming details and addresses 234 –
239 for de-emphasis programming details.
for details.
Handling and Cleaning
The transmitter and receiver modules can be damaged
by exposure to current surges and over voltage events.
Care should be taken to restrict exposure to the condi-
tions defined in the Absolute Maximum Ratings. Wave
soldering, reflow soldering and/or aqueous wash process
with the modules on board are not recommended.
Normal handling precautions for electrostatic discharge
Control Signal Interface
The control interface includes dedicated signals for
address inputs, interrupt output and reset input and bidi- sensitive devices should be observed.
rectional clock and data lines for a two-wire serial access
Each module is supplied with an inserted port plug for
protection of the optical ports. This plug should always
be in place whenever a fiber cable is not inserted.
(TWS interface) to control and status and information
registers. The TWS interface is compatible with industry
standard two-wire serial protocol scaled for 3.3 volt LVTTL.
It is implemented as a slave device. Signal and timing The optical connector includes recessed elements that
characteristics are further defined in the Control Charac- are exposed whenever a cable or port plug is not inserted.
teristics and Control Interface & Memory Map sections.
Prior to insertion of a fiber optic cable, it is recommended
that the cable end be cleaned to avoid contamination
from the cable plug. The port plug ensures the optics
remain clean and no addition cleaning should be needed.
In the event of contamination, dry nitrogen or clean dry
air at less than 20 psi can be used to dislodge the contami-
nation. The optical port features (e.g. guide pins) preclude
use of a solid instrument. Liquids are also not advised.
The registers of the serial interface memory are defined in
the Control Interface & Memory Map section.
Regulatory & Compliance Issues
Various standard and regulations apply to the modules.
These include eye-safety, EMC, ESD and RoHS. See
the Regulatory Section for details regarding these and
component recognition. Please note the transmit-
ter module is a Class 1M laser product – DO NOT VIEW
RADIATION DIRECTLY WITH OPTICAL INSTRUMENTS. See
Regulatory Compliance Table for details.
Data
0
1
0
0
0
1
0
1
1
1
1 bit
De-Emphasis (DE)
Steady-State (SS)
Output
Voltage
De-Emphasis % = (DE/SS)(100%)
Figure 5. Definition of De-emphasis and Steady State
4
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