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ADV3003-EVALZ 数据表(PDF) 10 Page - Analog Devices

部件名 ADV3003-EVALZ
功能描述  HDMI/DVI TMDS Equalizer
Download  16 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADV3003-EVALZ 数据表(HTML) 10 Page - Analog Devices

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ADV3003
Rev. 0 | Page 10 of 16
THEORY OF OPERATION
INTRODUCTION
The primary function of the ADV3003 is to buffer the four high
speed channels of a single HDMI or DVI link. The HDMI/DVI
link consists of four differential, high speed channels and four
auxiliary single-ended, low speed control signals. The high
speed channels include a data-word clock and three transition
minimized differential signaling (TMDS) data channels
running at 10× the data-word clock frequency for data rates
up to 2.25 Gbps.
All four high speed TMDS channels on the ADV3003 are
identical; that is, the pixel clock can be run on any of the four
TMDS channels. Receive channel compensation (12 dB of
fixed equalization) is provided for the high speed channels
to support long input cables. The ADV3003 also includes
selectable pre-emphasis for driving high loss output cables
or long PCB traces.
In the intended application, the ADV3003 is placed between
a source and a sink, with long cable runs at both the input and
the output.
INPUT CHANNELS
Each high speed input differential pair terminates to the
3.3 V VTTI power supply through a pair of single-ended 50 Ω
on-chip resistors, as shown in Figure 25. When the transmitter
of the ADV3003 is disabled by setting the TX_EN control pin
as shown in Table 5, the input termination resistors are also
disabled to provide a high impedance node at the inputs. Disabl-
ing the input terminations when the transmitter is disabled
indicates to any connected HDMI sources that the link through
the ADV3003 is inactive.
CABLE
EQ
50Ω
TX_EN
50Ω
IP[3:0]
IN[3:0]
AVEE
VTTI
Figure 25. High Speed Input Simplified Schematic
The input equalizer provides 12 dB of high frequency boost.
No specific cable length is suggested for this equalization level
because cable performance varies widely among manufacturers;
however, in general, the ADV3003 does not degrade input
signals, even for short input cables. The ADV3003 can equalize
more than 20 meters of a 24 AWG cable at 2.25 Gbps, for
reference cables that exhibit an insertion loss of −15 dB at the
fundamental frequency of this data rate.
OUTPUT CHANNELS
Each high speed output differential pair of the ADV3003
terminates to the 3.3 V VTTO power supply through two
single-ended 50 Ω on-chip resistors, as shown in Figure 26.
TX_EN
VTTO
50Ω
50Ω
OP[3:0]
ON[3:0]
AVEE
IOUT
Figure 26. High Speed Output Simplified Schematic
The output termination resistors of the ADV3003 back-terminate
the output TMDS transmission lines. These back-terminations,
as recommended in the HDMI 1.3 specification, act to absorb
reflections from impedance discontinuities on the output traces,
improving the signal integrity of the output traces and adding
flexibility to how the output traces can be routed. For example,
interlayer vias can be used to route the ADV3003 TMDS outputs
on multiple layers of the PCB without severely degrading the
quality of the output signal.


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