<div dir="ltr">I say keep the diode in case somebody drops in an SSM as a replacement...</div><br><div class="gmail_quote"><div dir="ltr">On Tue, Aug 7, 2018 at 7:53 PM Tim Ressel <<a href="mailto:timr@circuitabbey.com">timr@circuitabbey.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Yeah, upon further study I realize it is moot. 0 Volts = unity gain and <br>
higher voltages reduce the gain i.e. attenuate. The SSM2164 sez max <br>
voltage on the control port is -V to +V while the SSI2164 data sheet <br>
doesn't seem to say anything about range so I assume it is the same.<br>
<br>
So I dropped my flag in error. Sorry about that.<br>
<br>
Apparently the protection diode is not needed with the SSI2164 but maybe <br>
use it anyway. They is cheap.<br>
<br>
All in all a good chip. Glad it is available.<br>
--tr<br>
<br>
On 8/7/2018 3:15 PM, Tom Wiltshire wrote:<br>
> No, it means the original datasheet was full of nonsense. That 0-5V input was never correct, and didn’t make sense even with the rest of the stuff they said.<br>
><br>
>> On 7 Aug 2018, at 22:35, Tim Ressel <<a href="mailto:timr@circuitabbey.com" target="_blank">timr@circuitabbey.com</a>> wrote:<br>
>><br>
>> Flag on the play<br>
>><br>
>> The SSI2164 is saying 0 to 3.3 volts on the control port for attenuation whereas the SSM2164 says 0 to 5 volts. Does this mean it is not a direct replacement for the SSM2164?<br>
>><br>
>> --TimR<br>
>><br>
>><br>
>> On 8/7/2018 1:41 PM, Neil Johnson wrote:<br>
>>> Hi all,<br>
>>><br>
>>> Anyone with more than a passing interest in the 2164 quad VCA might be<br>
>>> interested in the latest version of the SSI2164 datasheet just<br>
>>> published online by Sound Semiconductor.<br>
>>><br>
>>> While specifically for the SSI2164 there is a lot of useful info there<br>
>>> that also relates to the earlier SSM2164 (and the Behringer/CoolAudio<br>
>>> V2164 clone).<br>
>>><br>
>>> Highlights for me:<br>
>>> * Explanation and formula for working out the compensation network<br>
>>> (confirms my earlier hand-wavey analysis)<br>
>>> * A superior expo converter by Dave Rossum<br>
>>> * More details on the internal workings<br>
>>><br>
>>> Direct link: <a href="http://www.soundsemiconductor.com/downloads/ssi2164datasheet.pdf" rel="noreferrer" target="_blank">http://www.soundsemiconductor.com/downloads/ssi2164datasheet.pdf</a><br>
>>><br>
>>> Cheers<br>
>>> Neil<br>
>> -- <br>
>> --Tim Ressel<br>
>> Circuit Abbey<br>
>> <a href="mailto:timr@circuitabbey.com" target="_blank">timr@circuitabbey.com</a><br>
>><br>
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<br>
-- <br>
--Tim Ressel<br>
Circuit Abbey<br>
<a href="mailto:timr@circuitabbey.com" target="_blank">timr@circuitabbey.com</a><br>
<br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>Quincas Moreira<br>Synth Diy Guy</div></div></div>