[sdiy] Problems with linearized SSI2164 ?

Mattias Rickardsson mr at analogue.org
Wed Feb 6 23:41:55 CET 2019


Hi Danjel,

with 30k for Rin, do you mean one of the 100k in the linear control circuit?
If so, that's probably the reason it misbehaves.

Best,

/mr


Den ons 6 feb. 2019 23:19 skrev Danjel van Tijn <danjel at intellijel.com>:

> Hi there,
>
> Has anyone else experienced issues with the SSI2164 used in place of a
> Coolaudio 2164 in a linearized VCA configuration?
>
> With no CV applied to the circuit control pin of the VCA should be close
> to 0 (and it is when I swap back in a coolaudio chip)  but with a SSI2164
> the voltage at the control pin is around 0.85V.
>
> I am using accurate voltage sources for the negative and positive voltage
> references (-5 and +5). and as aforementioned swapping in a coolaudio chip
> returns the circuit to working as expected.
> Opamp is a  TI TL072CPWR.
>
> The only two differences from the datasheet version are that we are using
> 30K for Rin and 510R+560p for stability;  both are within range of
> acceptable values according to datasheet.
>
> Any thoughts?  possibly bad batch of ICs?
>
>
> --
> cheers,
>
> Danjel van Tijn
> Intellijel Designs Inc.
> m. +001 604-773-2426 <(604)%20773-2426>
>
> www.intellijel.com
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