Are there logic operators available for the GPIO inputs of the ADAU1445?

Hello Gerard.

I tried the schematic below on a ADAU1701, but the concept should also work on a -1445. Three GPIO inputs are assigned power-of-two weights by their Buffer Gate bit positions. They're added to produce a number from 0 to 7, which drives the De-Multiplexer to output a 1 in that numbered slot. The result is similar to a BCD -- 1 of 8 decoder.

Best regards,

Bob

Hi Bob,

Thank you.

I understand the demultiplexer outputs are able to control sigma studio functions like externally controlled xfaders?

With kind regards,

Gerard van Beijsterveld

Hi,

Blocks such as slew muxes (cross-fade) expect an "integer" (28.0) format control input, while other blocks (such as volume controls) expect a 5.23 full scale input. You can choose which format the demux outputs by changing its DC source input, or by using Buffer Gates at each demux output as needed. Unselected demux outputs are zero, fortunately the same in any format.

Bob

Thank you Bob,

I’ll try it.

Gerard van Beijsterveld

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