What do we think about solid-state potentiometers?

JanErik

Member
2010-08-09 9:35 am
Vasa
I have a few of these and am thinking to incorperate them in either an existing amp or a future DAC. What is the general consensus on these, better or worse than a normal pot in the signal chain?

PGA2310PA, +/-15V Stereo Audio Volume Control, Audio - Volume Control - PGA2310 - TI.com

DS1882E, Dual Log Audio Digital Potentiometer, DS1882 Dual Log Audio Digital Potentiometer - Overview

MAX5475, 32-Tap, Nonvolatile, Linear-Taper Digital Potentiometers, MAX5471, MAX5472, MAX5474, MAX5475 32-Tap, Nonvolatile, Linear-Taper Digital Potentiometers in SOT23 - Overview
 

Mooly

Administrator
Paid Member
2007-09-15 8:14 am
Yes, the video seems to have been removed. I couldn't find it elsewhere either.

It was an informative discussion... the general feeling being that a good analogue control was superior to digital, I think because of resolution (as in bit depth) at low level.
 

sarathssca

Member
2014-05-12 7:47 am
Yes, the video seems to have been removed. I couldn't find it elsewhere either.

It was an informative discussion... the general feeling being that a good analogue control was superior to digital, I think because of resolution (as in bit depth) at low level.

Hi Mooly,

But here for the signal path for the both will be analog only..only the control part will be different ie. analog or digital control.
So will it make any difference between analog or digital potentiometers (ds1882 etc)?
Also how about using relays and resister ladders for potentiometer action?

thanks and regards
S Sarath
 

Mooly

Administrator
Paid Member
2007-09-15 8:14 am
I haven't used the type of devices you mention... maybe others that have can comment on that. For me, a motorised pot located at the most suitable physical location on the PCB is the best option. Resistor ladders/relays and switched attenuators suffer limited setting resolution, and are layout and 'real estate' intensive making them prone to slight noise pickup.
 

Pano

Administrator
Paid Member
2004-10-07 6:05 am
Panama
It's important to note that the potentiometers linked to above are all analog pots with digital control. They do not attenuate a digital audio signal, but an analog one. Only the control is digital.

IMO, if the signal is digital, use digital volume control wherever possible. I have done extensive measurements and listening tests of digital volume control and can find not problem with it at all. The only thing that changes is S/N ratio, as one would expect.
 
Having a range of devices to compare including pga 2311 digital pre
Quad 44 with LM4562 and LME49710 , and a LDR preamp, and if music
is what you use your preamp for, the LDR wins every time.

Initial tests show a pga2311 can accept and pass DC where voltage/current
is limited for feeding the anode of a LDR - this is perhaps where pga2311
or other digital chips can be used.

Cheers / Chris
 
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