TAS6754-Q1: about Gain

Part Number: TAS6754-Q1

Tool/software:

Hello, Team,

Please explain the meaning of “Gain 28V/FS” in the datasheet.

“TEST CONDITIONS” states “Peak output voltage at full scale digital input.”
Since it's “full scale digital input,” this corresponds to a 0dBFS input signal.

Simply calculating the output power at 28Vpeak yields 24.49W @ 4 ohms.
This value does not appear to match the value listed under “OUTPUT POWER”.

How should we interpret this Gain value?
Which value does 28Vpeak represent?
Is it the value before the LC filter?
Or is it the value after the LC filter?

Regards,
Kenji Gemma

  • Kenji,

    Your 24.49W calculation is based on a 28Vpp voltage and not a 28Vp voltage. 

    28Vp / 1.414 = 19.8Vrns

    19.8Vrms * 19.8Vrms / 4 ohms = 98W max

    We are voltage limited, so the amplifier will voltage clip before it can reach these power values.

    Regards,
    Gregg Scott