Sdi Tx Channels - Altera SDI HSMC Reference Manual

Chapter 2: Board Components
Audio/Video Input and Output
Figure 2–7. SDI RX Channel Block Diagram

SDI TX Channels

The SDI TX channel consists of a SDI cable tri-speed driver (LMH0302) with slew rate
control, an output impedance matching network, an output vertical mount with a
4-GHz BNC connector, an SDI rate select control signal, DC blocking caps on the input
and output, and a red/green LED.
f
For the TX channel circuit diagram, refer to the schematic page entitled SDI Cable
Driver on page 5 of Altera schematic 150-0320610-B1. In Altera development kits that
contain the SDI HSMC, this schematic resides in the <install dir>\board_design_files
directory.
The SDI_RATE_SEL signal is driven from the host device through the HSMC
connector pins 71 and 73. These pins should not be allowed to float. A logic 1 reduces
the slew rate to match the SD-SDI signaling requirements while a logic 0 increases the
output slew rate of the SDI cable driver and is used when transmitting 1.485 Gbps rate
(HD) and 2.970 Gbps rate (3G).
© July 2009 Altera Corporation
SDI RX
LR
Network + Term
DC Block
bypass
SDI Cable
Equalizer
DC Block
Carrier Detect
SDI HSMC Reference Manual
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