Tue Oct 19 01:34:43 CEST 2010

Programmable gain amplifiers

To make some noise with digitally controlled analog circuits, it might
be interesting to look at programmable gain amps that can be inserted
into SVF filter feedback loops.  Maxim has some.  What this needs is
dynamic range.  The MAX9939[1] might be an intersting candidate,
however it has only 10 settings.  Can such a thing be modulated?

Another one is DS4420[2] which has a 60dB/3dB scale.

Maybe a digi pot is better[3]..  This goes to 1024 steps linear and
128 steps log.  I've ordered samples for DS1807[4] and DS1801[5].

[1] http://www.maxim-ic.com/datasheet/index.mvp/id/5825
[2] http://www.maxim-ic.com/datasheet/index.mvp/id/5218
[3] http://para.maxim-ic.com/en/results.mvp?fam=dig_pot
[4] http://www.maxim-ic.com/datasheet/index.mvp/id/2782
[5] http://www.maxim-ic.com/datasheet/index.mvp/id/2777