The TDP158 is a signal
conditioning device that provides several forms of signal conditioning to
support compliance for HDMI or DVI at a source connector. These forms of signal
conditioning are accomplished using receive equalization, re-timing, and output
driver configurability. The transmitter will drive 1”– 2” of board trace and
connector when compliance is required at the connector.
To design in the TDP158 the
following need to be understood for a source side
application:
- Determine the loss profile
between the GPU/chipset and the HDMI /DVI
connector.
- Based upon this loss profile
and signal swing determine optimal location for
the TDP158, to pass source
electrical compliance. Usually within 1”– 2” of
the connector.
- Use the typical application
Figure 8-1 for information on control pin resistors.
- The TDP158
has a receiver equalizer but can also be
configured using EQ1 and EQ2 control pins.
- Set the VOD,
pre-emphasis, termination, and edge rate levels
appropriately to support compliance by using the
appropriate VSADJ resistor value and setting
SDA_CTL/PRE, TERM and SLEW control pins.
- The thermal pad must be
connected to ground.
- See schematics in Figure 8-1 on recommended decouple caps from
VCC pins to ground.