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PGA2311 is to qiet

MP1993
Prodigy 40 points
Other Parts Discussed in Thread: PGA2311

Hello,

i have biuld a circuit with a PGA 2311 and he is to qiet. It is louder when i bridge the input pins to the output pins. Its louder without the PGA2311. I have used the recommended Connection from the PDF (Figure5). At start N is 150 and i didn't hear anything out of the speakers and if N is 255 i can hear the sound, but it's not as loud as i can hear without the PGA2311. The power supply is VA+ 5,1V , VA-  -4,9V and VD+ 4,97V.  The transformer for the Analog side has 1,8VA and 2x6V.  7805 and 7905 regulate the Voltage.

I hope you can help me.

Marius 

  • 0
    TI__Mastermind 27715 points

    Hello Marius,

    It seems like there's a wiring error in your circuit. Unfortunately I can not see the schematic image clearly in order to make a further assessment. Can you please re-upload the schematic at a higher resolution, or upload it as a file instead of an image?

    Best regards,

    Ian Williams
    Linear Applications Engineer
    Precision Analog - Op Amps

  • 0
    Prodigy 40 points

    Here is the Eagle File

    atmega16 pga neu.sch

    And a new Image ( I hope this is better)

  • 0 in reply to MP1993
    TI__Mastermind 27715 points

    Hello Marius,

    Thank you for the new image - it is very clear. After reviewing your schematic I have some follow-up questions and recommendations.

    1. AGND and DGND must be shorted together, preferably at a single point. Looking at your schematic I don't see that this is the case. Can you please confirm if the two ground nodes are shorted?
    2. It looks like you're using a network of switches to create your own input multiplexer. I see where the off-board input jumpers connect to VIN_R and VIN_L, but where does the input connect to AGND? The analog input and output of the PGA2311 are unbalanced (referred to AGND) so you must connect the ground of the input to AGND. If the inputs are floating with respect to the PGA2311, you may damage the device or drive it into heavy saturation.
    3. The PGA2311 powers up into a software MUTE state. Are you writing a new gain value, such as 0dB or higher, before attempting to pass audio through the device?
    4. You said that the audio signal is louder at the output when you bridge the input to the output. Can you please specify how you are doing this?

    Best regards,

    Ian Williams

  • 0 in reply to Ian Williams
    Prodigy 40 points

    Thank you for the fast reply.

    1. The conntectors JP14 (Digital Ground) and JP15 (Analog Ground) are connected by a wire from JP 14 to JP 15.

    2. The audio input is connected to JP 15 ( Analog Ground)

    3. At start the PGA get a value of 150.

    4. The PGA is mountet at a socket and i removed the PGA and connected Pin16 to 14 and Pin 9 to 11.

    Some pictures from the board

  • 0 in reply to MP1993
    Prodigy 40 points

    I have found the mistake. It was a faulty solder joint at the mute pin. Sometimes the solder joint must have contact because at the measurement was 5V at the mute pin.

    Now everything works fine and I can listen this smooth sound.

    Thanks for your help

    Best regards

    Marius

  • 0 in reply to MP1993
    TI__Mastermind 27715 points

    Hello Marius,

    I'm happy to hear that your issue was resolved! Enjoy the smooth sound of the PGA2311.

    Best regards,

    Ian Williams