dBFS to Voltage Map (MA12070P)

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emiliano
Level 1
Level 1
First question asked Welcome!

Hi all! I'm Emiliano from DSP development at KomboAudio. 
Our current system consists of a main DSP to an Infineon MA12070P (through I2C, without any scaling).

We would like to know the relationship between the dBFS DSP output and the Voltage in the amplifier.
For example, we assume that 0 dBFS matches the maximum 26V; and -inf dBFS would match 0V.
In other words, we would like a graph/table showing on the x-axis the dBFS values and on the y-axis the Voltage.

Thanks!
Emiliano

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1 Solution
Nishanth
Moderator
Moderator
Moderator
50 likes received 100 solutions authored 10 likes given

Hello @emiliano,

Thank you for contributing to the Infineon community.

0dBFS correlates to the maximum output level just before clipping (full-scale output) with a 26V supply. This gain (0dBFS) is constant over the entire supply range, e.g. the output will be severely distorted by a 0dBFS at a supply voltage of 13V. A -6dBFS gain reduction will yield an undistorted, full scale-output. Gain can be manipulated with the volume control registers. Please refer to the datasheet MA12070P datasheet  p. 19-20, Table 8-9 for volume control register/mapping. A full-featured limiter function is also available, please see the datasheet p. 20-22.

Please feel free to reach out to us if you need further clarification on this topic. 

Regards,

Nishanth

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1 Reply
Nishanth
Moderator
Moderator
Moderator
50 likes received 100 solutions authored 10 likes given

Hello @emiliano,

Thank you for contributing to the Infineon community.

0dBFS correlates to the maximum output level just before clipping (full-scale output) with a 26V supply. This gain (0dBFS) is constant over the entire supply range, e.g. the output will be severely distorted by a 0dBFS at a supply voltage of 13V. A -6dBFS gain reduction will yield an undistorted, full scale-output. Gain can be manipulated with the volume control registers. Please refer to the datasheet MA12070P datasheet  p. 19-20, Table 8-9 for volume control register/mapping. A full-featured limiter function is also available, please see the datasheet p. 20-22.

Please feel free to reach out to us if you need further clarification on this topic. 

Regards,

Nishanth