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DIR1703E input SPDIF from SN74LVC2GU04

Atharva U
Intellectual 400 points
Other Parts Discussed in Thread: SN74LVC2GU04, TLV3201, TLV7011, TLV7012

Hi,

We are looking at TAS5001-5122C2EVM Application Report. Attached here.

0451.DASF00654 (1).pdf

Have one question on SPDIF input to SN74LVC2GU04.

SPDIF input after C100 is pure AC with 600mV pk-pk. This is after assuming, capacitor removes all DC content.

How SN74LVC2GU04 can pick up this voltage levels as high/low ? Datasheet says min 2.5V required for high logic.

Please help us understand.

Thanks
ATharva

  • +1
    Guru 243980 points

    The SN74LVC2GU04 is an unbuffered inverter, which means that the I/O pins go directly to the two MOSFETs that make up the inverter, and that you can use analog properties of these transistors to create an analog amplifier. R102 biases the input to about VCC/2, which should be near the switching threshold. The second inverter amplifies the signal further, so that the output voltage reaches valid logic levels.

    Nowadays, I'd recommend to use a fast comparator (e.g., TLV7011, TLV3201) instead.

  • 0 in reply to Clemens Ladisch
    Intellectual 400 points

    Thanks for the inputs. It is actually providing offset at the inputs, so input voltage does not swing negative\

    Will try to see TLV7012