ADV3002 datasheet(21/28 Pages) AD

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ADV3002

Rev. 0 | Page 21 of 28

APPLICATIONS INFORMATION

HDMI MULTIPLEXER FOR ADVANCED TV

The ADV3002 is a complete HDMI/DVI link switch featuring

equalized TMDS inputs, ideal for systems with long cable runs.

The ADV3002 includes bidirectional buffering for the DDC bus

and CEC line, with integrated pull-up resistors for the CEC line.

Additionally, the ADV3002 includes an EDID replication function

that enables one EDID EEPROM to be shared for all four HDMI

ports. Alternatively, a system standby microcontroller can be

used instead of a dedicated EDID EEPROM to load the ADV3002

SRAM. Simplified application schematics are shown in Figure 33

and Figure 34 illustrating these two options.

HDTV SET

ADV3002

HDMI

SoC

MAIN PCB

Figure 30. ADV3002 as an HDMI Multiplexer in an HDTV

TMDS Signals

TMDS signals can be routed from an HDMI connector directly

to the inputs of the ADV3002. Additional components are not

required for the TMDS signals.

DDC Signals

47 kΩ pull-up resistors to 5 V are recommended for the DDC

input signals.

CEC Signal

The CEC buffer in the ADV3002 provides a fully compliant

input in situations where a general-purpose microcontroller is

used to interpret CEC commands. The rise time of the CEC

buffer is set by the time constant of the pull-up resistance and

the capacitance on the node. A 2 kΩ pull-up resistor to 3.3 V is

recommended for optimal output rise times. If a 3.3 V is not

available when the system power is off, a Thevenin equivalent

2 kΩ pull-up resistor to 3.3 V is shown in Figure 31.

ADV3002

MCU

CEC_OUT

CEC_IN

Ω

5V_COMBINED

AMUXVCC

Figure 31. CEC Circuit

5 V Power

The individual 5 V power from each HDMI source can be routed

to the respective 5 V inputs of the ADV3002. The ADV3002

combines these four 5 V supplies into one labeled AMUXVCC

to support EDID replication and CEC functionality when the

local system power is off. An internal 5 V supply must be provided

so that power is not drawn from the HDMI sources when the

local system power is on. When the local supply is off, this internal

5 V should be high impedance. This can be assured by using a

Schottky diode, as shown in Figure 32.

P5V_A

5V INTERNAL

P5V_B

P5V_C

P5V_D

AMUXVCC

Figure 32. 5 V Power Connections

ADV3002 Datasheet(PDF) 21 Page - Analog Devices

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