Has anyone tried the above device for a volume control?
*1024 steps - nice because you can use the top 2 bits for level matching between sources
*20k, 50k and 100k versions - 20k and 50k look useful. 100k has bandwidth issues
*Distortion very low - quoted at <90db FS for the 20k version and 93db FS for the 20k version -
*+-16.5V analog signal capability - great because most digital pots nowdays are designed for 3-5 *volt portable systems - other than DS1808, I don't know of any stand alone high voltage, l*ow distortion log pots (the Maxim devices have high distortion specs unfortunately)
*easy serial interface
This is a linear pot. But , if for example you take th e 50k pot and connect a 10k resistor between the wiper and ground, you get a psuedo log response - see the attached picture.
Heres the data sheet link:-
AD5292 | Single Channel, 1024-Position, 1% R-Tol, Digital Potentiometer with 20-Times Programmable Memory | Digital Potentiometers | Digital to Analog Converters | Analog Devices
There is a short section in the data sheet about it s use as a volume control, but th e focus is on reducing zipper noise. However, if this thing is being driven from a rotary encoder and there are NO step changes in the volume setting (so always monotonic) then this should not be a problem (maybe only on the rollover from 511 to 512? does anyone have any experience on this)
I am also interested to know if there is any distortion as a result of loading the wiper in the manner described. Any ADI guys around that can comment?
Comments welcome
*1024 steps - nice because you can use the top 2 bits for level matching between sources
*20k, 50k and 100k versions - 20k and 50k look useful. 100k has bandwidth issues
*Distortion very low - quoted at <90db FS for the 20k version and 93db FS for the 20k version -
*+-16.5V analog signal capability - great because most digital pots nowdays are designed for 3-5 *volt portable systems - other than DS1808, I don't know of any stand alone high voltage, l*ow distortion log pots (the Maxim devices have high distortion specs unfortunately)
*easy serial interface
This is a linear pot. But , if for example you take th e 50k pot and connect a 10k resistor between the wiper and ground, you get a psuedo log response - see the attached picture.
Heres the data sheet link:-
AD5292 | Single Channel, 1024-Position, 1% R-Tol, Digital Potentiometer with 20-Times Programmable Memory | Digital Potentiometers | Digital to Analog Converters | Analog Devices
There is a short section in the data sheet about it s use as a volume control, but th e focus is on reducing zipper noise. However, if this thing is being driven from a rotary encoder and there are NO step changes in the volume setting (so always monotonic) then this should not be a problem (maybe only on the rollover from 511 to 512? does anyone have any experience on this)
I am also interested to know if there is any distortion as a result of loading the wiper in the manner described. Any ADI guys around that can comment?
Comments welcome
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For not have zero crossing it is a crap .
You will have a lot of noise if you do not implement the zero crossing circuit presented on page 29 of data sheet .
All this type of pots are not designed for audio , plain and simple !
Every CS and PG2310...2311 and 4311 will do the job without reinventing the hot water and bare foot walking .
You will have a lot of noise if you do not implement the zero crossing circuit presented on page 29 of data sheet .
All this type of pots are not designed for audio , plain and simple !
Every CS and PG2310...2311 and 4311 will do the job without reinventing the hot water and bare foot walking .
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