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HDMI TX ADV7511W

Hi,

I am using HDMI TX ADV7511W with its digital inputs interfaced to FPGA (Virtex 7).

The datasheet mentions that its video/audio logic accepts levels from 1.8V to 3.3V.

The IC ADV7511W has 1.8V Supply Voltage (DVDD, AVDD, PVDD, BGVDD) and 3.3V Supply Voltage (DVDD_3V). There is no specific IO voltage pin (like DVDD_IO for some other interfaces). So how does it know which IO Voltage its working with? 

Can I interface its digital inputs with LVCMOS18 IO standard working on 1.8V IO interfaced to FPGA?

-Chinmay

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  • FormerMember
    FormerMember
+1

Yes, the open drain can be pulled to 2.5V.

The power rails of the ADV7511 must remain as defined.  They can not be changed to 2.5V.  The inputs will work with 2.5V sources even though the rails are at 3…

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  • Okey, for the other hand, Hardware Users Guide indicates:

    " The interrupt pin, INT is an open drain output. It should be pulled to a logic high level (such as 1.8V or 3.3V depending on the high logic level of the microcontroller) through a resistor (2kOhm to 5kOhm)"

    The SDA and SCL pins should be connected to an I2C Master. A pull-up resistor of 2kΩ (+/-10%) to 1.8V or 3.3V is recommended for each of these signals. "

    So, can I pull-up these pins to 2.5V or the output timing can slow down?

    Moreover, to interface digital input pins to 2.5V, I have to change the level of the power supply pins (AVDD, BGVDD, DVDD, PVDD)?

    Thanks.

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  • Okey, for the other hand, Hardware Users Guide indicates:

    " The interrupt pin, INT is an open drain output. It should be pulled to a logic high level (such as 1.8V or 3.3V depending on the high logic level of the microcontroller) through a resistor (2kOhm to 5kOhm)"

    The SDA and SCL pins should be connected to an I2C Master. A pull-up resistor of 2kΩ (+/-10%) to 1.8V or 3.3V is recommended for each of these signals. "

    So, can I pull-up these pins to 2.5V or the output timing can slow down?

    Moreover, to interface digital input pins to 2.5V, I have to change the level of the power supply pins (AVDD, BGVDD, DVDD, PVDD)?

    Thanks.

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