PGA2310 - PGA2311 - CS3310: version without OPAMP for outdoor OPAmp connection wanted

[tiefbassuebertr]

The IC type from the headline have two disadvantages for me:
1) The quality standart of the internal OP-Amp is unknown - not very high however
2) the variable resistor for the volume control is located in the NFB. This means, that the THD character is dependend of the level position resp. of the individual adjusted gain factor (particularly by freqencies above 10 KHz).

Therefore for me the question rises up, whether there are other versions, both at whole passive for the analoge signal pad so as with additional pins for use of various external operational amplifiers like AD797, LME49710 etc.

Thanks for advices.

 

[davidsrsb]

How about this one by Analog?
http://www.analog.com/en/digital-to...l-potentiometers/ad5293/products/product.html
1024 taps and all three terminals exposed

 

[sonnya]

You can go 2 ways.

Davidsrsb solution. Which is analog devices and well documented datasheet

Or discrete R2R with todays standard of analog switches!

 

[exclusive]

as requested

MAS6116 - Stereo Digital Volume Control IC - Micro Analog Systems Oy

 

[maxw]

Or discrete R2R with todays standard of analog switches!

Any example of this?

 

[BV]

DAC8043 (or similar) in multiplying mode (see datasheet) with quality OA, eg. OPA1642, OPA1612..Results are very good (example in attachment), but uP is a must. It is far better than PGA, MAS, CS or similar..

 

[maxw]

DAC8043 (or similar) in multiplying mode (see datasheet) with quality OA, eg. OPA1642, OPA1612..Results are very good (example in attachment), but uP is a must. It is far better than PGA, MAS, CS or similar..

What do you mean by "uP"? Do you have a schematic?

Is this the same implementation as these two?
http://www.diyaudio.com/forums/soli...igh-precision-digital-control-attenuator.html
Audio electronic potenciometer

I want to make one!

 

[BV]

What do you mean by "uP"? Do you have a schematic?

uP-microprocesor interfacing, schematic fig. 3 in datasheet. Vref is signal input.
http://www.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=dac8043&fileType=pdf

 

[tiefbassuebertr]

interesting advices - thank you very much therefore.
An other question in this case is for me of interest. Which OP-Amp type corresponds to the integrated version at best?
The NE5532, OPA2604 or OPA2132?
Because there is no circuit diagram in the datasheet of PGA2310/2311, this is hard to say for me. Who know this ? The most interesting fact is the topology and the idle current of the output stage.
Maybe anybody can ask by TI this.
Thanks again.

 

[BV]

An other question in this case is for me of interest. Which OP-Amp type corresponds to the integrated version at best?

Today I would use e.g. OPA1611(or 1612-dual) or Jfet version OPA1641 (1642). There are no information about OA used in PGA, nor output idle current, but quiescent current for whole analogue section is about 10mA (both channels). I used PGA2310, but it was for me not satisfying..Try to find some information about THD(+N) vs.freq at gains other than 0dB, and input levels about 1V RMS, this is most used regime.

 

[Shinja]

Digital Potentiometers - Maxim
MUSES72320,MUSES72320V (18V Operation 2-Channel Electronic Volume) | MUSES Official Website

luxman and esoteric employed NJR's MUSES72320 in recent products.
yamaha's A-S3000 employs NJU72321, which seems to be the customized one for yamaha.
A-S3000 - Integrated Amplifiers - Yamaha - UK and Ireland

 

[spiri]

Use the Muses 72320!

I've finished my Protos and it sounds great.
I use only the 20k Pot
and a Fet Buffer with an OPA1632 Gainstage on an separate board.