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PGA2310 vs PGA2320 vs PGA2311 performance

Torje Nikolai Thorsen
Intellectual 520 points
Other Parts Discussed in Thread: PGA2320, PGA2310, PGA2311, PGA4311, LM2664

Dear TI,

The differences between the three volume control chips mentioned in the title seem to be rather subtle, apart from their supply voltage and package options. This raises some questions:


1) Regardless of supply voltage and package, which one should I choose in order to get the absolute best audio performance?

2) If I am happy with the SOIC package ("SOL-16"), is there any reason for using the PGA2310 instead of the PGA2320, since the latter is cheaper and supposed to have slightly better THD+N specs? Is the same die used in both products, hence the difference in THD+N simply a result of a different packaging process?

3) What are the differences and practical implications of the "mixed-signal BiCMOS process for superior analog characteristics" used for the PGA2310 and PGA2320 chips compared to the "sub-micron CMOS process" used for the PGA2311?

Best regards,
Torje

  • 0
    TI__Mastermind 27715 points

    Hello Torje,

    1. Disregarding supply voltage and package variations, the A-grade PGA2311 (or PGA4311 for a quad) has the best data sheet THD+N at 0.0002%, or -114dB, typical.
    2. Some reasons for using the PGA2310 over the PGA2320 would be higher operating temperature range, lower gain error, slightly lower noise, higher bandwidth (useful in active filter designs), and lower quiescent current. The benefit of the PGA2320 is slightly lower THD+N, better input and output range, and higher current output. The devices do not share a die, as evident by the differences in quiescent current and bandwidth, but it is very likely that the PGA2320 is a spin of the PGA2310, possibly for a customer that needed slightly tweaked specs.
    3. Given the age of these products, it would be difficult for me to find any information on what parts of the PGA2310/PGA2320 are bipolar vs. CMOS. My recommendation is to select the PGA2320 if you require a higher-voltage input and output, or the PGA2311/4311 if ±5V is sufficient.

    You also may be interested in THD+N vs. gain measurements I took last week on the PGA4311 and PGA2310. The increase of THD+N with increasing gain is due to the rising noise floor as well as the introduction of some even and odd order harmonics.

    Best regards,

    Ian Williams
    Linear Applications Engineer
    Precision Analog - Op Amps

  • 0 in reply to Ian Williams
    Intellectual 520 points
    Hello Ian,

    Thank you very much for your quick answer, it is very clear. I will go for the PGA2311 in my design then.

    I am indeed interested in the THD+N measurements you mentioned. However, it seems that I do not have permission to view/download this item. Would you mind sending it to me in a private message or changing the document's permissions?

    Best regards,
    Torje
  • 0 in reply to Torje Nikolai Thorsen
    TI__Mastermind 27715 points

    Hi Torje,

    Sorry about that. I've re-uploaded the measurements below. Please keep in mind this is a sample size of 1 device for each part number, but it is still a good indication of relative performance.

    PGA4311, PGA2310 THD+N vs. Gain.xlsx

    Best regards,

    Ian Williams

  • 0 in reply to Ian Williams
    Intellectual 520 points

    Hello Ian,

    Thank you for the interesting figures, the link is working perfectly now.

    Best regards,
    Torje N. Thorsen

  • 0 in reply to Ian Williams
    Prodigy 45 points
    Hi Ian,

    I just got the PGA2311, I would like to use it in my system but - I got only 1 5VDC power supply, is there any way to use it without second power supply (-5VDC)?

    Thanks in advance!
    Best regards,
    Alon
  • 0 in reply to Alon Perelmuter
    TI__Mastermind 27715 points

    Hello Alon,

    As specified in the power supply section of the PGA2311 data sheet, you must provide both a +5V and -5V supply in order for the device to function correctly. You may want to consider a voltage inverter device such as the LM2664 to generate a -5V supply from your existing +5V rail.

    Best regards,

    Ian Williams

  • 0 in reply to Ian Williams
    Prodigy 45 points
    Hi Ian,
    Thanks for the information.
    I just brought ICL7660, it also works as voltage inverter. but I have another problem.
    I have connected the PGA2311 by the typical application in figure 13 from the datasheet (www.ti.com/.../sbos218d.pdf)

    While streaming signal to VinL or VinR i am getting cracking noise in the Vout, like some loud electrostatic noise...
    Any idea why this could happened ? (I tried to connect -5V from differenct power supply and its the same...