ADV3003

Rev. 0 | Page 11 of 16

The ADV3003 has an external control pin, TX_EN. The

TX_EN pin must be connected to either a logic high (1) or

low (0), in accordance with the logic values set forth in Table 1.

The use of the TX_EN pin is described in Table 5. When the

transmitter is enabled by setting TX_EN to 1, both the input

and output terminations are enabled. Setting TX_EN to 0

disables the transmitter, reducing power when the transmitter

is not in use. When the transmitter is disabled, the input termi-

nation resistors are also disabled to present a high impedance

state at the input and indicate to any connected HDMI sources

that the link through the ADV3003 is inactive.

Table 5. Transmitter Enable Setting

TX_EN

Input

Termination

Transmitter

State

Output

Termination

0

Off

Off

On

1

On

On

On

The ADV3003 also includes two levels of programmable output

pre-emphasis, 0 dB and 6 dB. The output pre-emphasis level can

be manually configured by setting the PE_EN pin. The PE_EN

pin must be connected to either a logic high (1) or low (0), in

accordance with the logic values set forth in Table 1. The use of

the PE_EN pin is described in Table 6. No specific cable length

is suggested for use with either pre-emphasis setting, because

cable performance varies widely among manufacturers.

Table 6. Pre-Emphasis Enable Setting

PE_EN

Boost

0

0 dB

1

6 dB

In a typical application, the output of the ADV3003 is

connected to the input of an HDMI/DVI receiver, which

provides a second set of matched terminations in accordance

with the HDMI 1.3 specification. If neither receiver nor receiver

termination is connected to the output of the ADV3003 in the

end-application, each ADV3003 output pin should be tied to 3.3

V through a 50 Ω resistor.