ADV3000-EVALZ AD [Analog Devices], ADV3000-EVALZ Datasheet - Page 21

• Manufacturer Part Number: ADV3000-EVALZ
• Description: 3:1 HDMI/DVI Switch with Equalization
• Manufacturer: AD [Analog Devices]

APPLICATION INFORMATION
The ADV3000 is an HDMI/DVI switch, featuring equalized
TMDS inputs and pre-emphasized TMDS outputs. It is intended
for use as a 3:1 switch in systems with long cable runs on both
the input and/or the output, and is fully HDMI 1.3 receive-
compliant.
PINOUT
The ADV3000 is designed to have an HDMI/DVI receiver
pinout at its input and a transmitter pinout at its output. This
makes the ADV3000 ideal for use in AVR-type applications
where a designer routes both the inputs and the outputs directly
to HDMI/DVI connectors, as shown in Figure 31. When the
ADV3000 is used in receiver type applications, it is necessary to
change the order of the output pins on the PCB to align with the
on-board receiver.
One advantage of the ADV3000 in an AVR-type application is
that all of the high speed signals can be routed on one side (the
topside) of the board, as shown in Figure 31. In addition to
12 dB of input equalization, the ADV3000 provides up to 6 dB
of output pre-emphasis that boosts the output TMDS signals
and allows the ADV3000 to precompensate when driving long
Figure 31. Layout of the TMDS Traces on the ADV3000 Evaluation Board (Only Top Signal Routing Layer is Shown)
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PCB traces or output cables. The net effect of the input
equalization and output pre-emphasis of the ADV3000 is that
the ADV3000 can compensate for the signal degradation of
both input and output cables; it acts to reopen a closed input
data eye and transmit a full swing HDMI signal to an end
receiver. More information on the specific performance metrics
of the ADV3000 can be found in the Typical Performance
Characteristics section.
The ADV3000 also provides a distinct advantage in receive-type
applications because it is a fully buffered HDMI/DVI switch.
Although inverting the output pin order of the ADV3000 on the
PCB requires a designer to place vias in the high speed signal
path, the ADV3000 fully buffers and electrically decouples the
outputs from the inputs. Therefore, the effects of the vias placed
on the output signal lines are not seen at the input of the ADV3000.
The programmable output terminations also improve signal
quality at the output of the ADV3000. The PCB designer therefore
has significantly improved flexibility in the placement and
routing of the output signal path with the ADV3000 over other
solutions.
ADV3000