Switching Matrix

I think I found a way to implement the submodular synthesizer architecture that I have been thinking about. Following discussions with my good friend Dave, I believe that I could use the AD75019 analog crosspoint switch as a foundation. This device is essentially a matrix of 256 switches that lets you route an analog signal from any one of 16 inputs to any one of 16 outputs, with minimal distortion (no gain, 150 Ω on resistance), and a very simple serial interface for digital control.

What’s more, multiple devices can be cascaded in order to extend the number of switches in the array, while using a single serial interface. As a result, a 32 × 32 matrix could be created with four devices, and a 64 × 64 with 16. At $20 a piece, this would remain relatively affordable. The device uses the 44 ld PLCC package, which could be interfaced to a prototyping breadboard with this adapter.


2 thoughts on “Switching Matrix

  1. Julien says:

    Be careful with such a matrix. With the 150 Ω on resistance you’ll have voltage drop accross it. For CV signals that control a VCO frequency this will raise tuning issues. For CV signal that control an LFO speed or an ADSR this won’t harm though. This is the same issue that you have with active mult, you want Vin == Vout.


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