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PCM2704: DAC on PCM1794+DIR9001

Gennadiy Poznyakov
Prodigy 140 points
Part Number: PCM2704
Other Parts Discussed in Thread: DIR9001, , INA1650, PCM1794, PCM2903C

Hello!

Can you please tell me if this scheme will work?

I'm not sure about the possibility of such a connection between PCM2704 and DIR9001. I'm also interested in pins 23 and 22 from DIR9001. Did I connect them correctly?

Is it possible to use the INA1650 chip for the final signal output from PCM1794?

I want to connect a smartphone to the input via an OTG cable.

Thank you!

  • 0
    TI__Mastermind 26431 points

    Hi, i will take a look at it today or tomorrow and let you know.

    Regards,

    Arash

  • 0 in reply to Arash Loloee
    TI__Mastermind 26431 points

    Hello, The FILT is connected to the charge pump and and values you used for its component looks consistent with datasheet.

    I believe it is better to use  one of our CODECs such as PCM2903C that has USB interface and get the analog out from its DAC . But if you want to go from a USB DAC to interface and then another DAC that is your choice, it should work too. The OPAMP recommendation needs to come from the other product line as I suggested before  and they can give you different options/alternatives.

    Regards,

    Arash

  • 0 in reply to Arash Loloee
    Prodigy 140 points

    Please tell me how to correctly formulate the text of the question about OPAMP. The power supply of the device is one polar (battery 12V).

    I do not know much English.

    Thank you!

  • +1 in reply to Gennadiy Poznyakov
    TI__Mastermind 26431 points

    Hello, If you need an alternative IC to replace INA1650 ( as you were asking in your previous post)  then it is better to ask the question from the OPAM experts .

    PCM1794 User's guide recommends using OPA2134A , but you can use any comparable opamp. Looking at specs of both amplifiers , INA has slower slew rate  and a little bit worse CMRR but  i think you can use INA1650. Note that you can use either of them with single supply. 

    Regards,

    Arash