• State Resolved
  • Locked Locked
  • Replies 8 replies
  • Answers 2 answers
  • Subscribers 31 subscribers
  • Views 547 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TLV320AIC1110: PCM codec replacement

Conor
Guru 12745 points
Part Number: TLV320AIC1110
Other Parts Discussed in Thread: TLV320AIC1106,

Hi,

Below is a PCM codec from TI. 
https://www.ti.com/audio-ic/converters/codec/products.html#1340=PCM&sort=1130;asc&

I am considering a TI product as a replacement for the LAPIS MSM7732A.

https://www.lapis-tech.com/en/data/datasheet-file_db/telecom/FEDL7732A-01-03.pdf

Does TI have a similar product?

It seems that TLV320AIC1106, TLV320AIC1110, etc. are applicable, but could you give me some advice?

Thanks,

Conor

  • 0
    TI__Mastermind 31985 points

    Hi Conor,

    Thanks for reaching out. 

    AIC1106 is for u-law and AIC1110 is for both A-law and u-law. AIC1110 seems to be the closest to the LAPIS part mentioned above.

    Most, if not all, of our CODECs are linear PCM. CODECS with the miniDSP (like AIC3262) can perform A-law/u-law using Pure Path Studio as well however these tend to be more difficult to configure. 

    Let me know if you have further questions. 

    Best,
    Andrew

  • 0 in reply to Andrew J
    Guru 12745 points

    Hi Andrew,

    We are considering AIC 1110.

    1. I could not find any reference schematics in the datasheet. Is there a reference schematic for AIC1110 ?

    2. I was planning to output using the MSM7732A VFRO (received audio signal output), but is there a part with such a terminal?
    　Should I use single-ended EAR2O?

    3. What is the meaning of MIC Amplifier 1 and 2?
    　The MSM7732A does not seem to have such a circuit, so I would like to know the meaning of gain control immediately after input.

    Thanks,

    Conor

  • 0 in reply to Conor
    TI__Mastermind 31985 points

    Hello Conor, 

    Glad to hear you are considering AIC3110.

    1. Although there is not an active EVM for this device, please consider using the EVM Guides as a reference (TLV320AIC1103/1109/1110EVM Users Guide (ti.com) and DSP - CODEC Development Platform UG (ti.com)
    2. I believe the EAR1 and EAR2 outputs are the closest to the MSM7732A's VFRO pin
    3. Gain control immediately after the input is an analogue Programable Gain Amplifier. This is useful when the microphone signal is normally quiet. The signal can be gained in the analogue domain to maximize the head room before the A/D conversion. 

    Best,
    Andrew

  • 0 in reply to Andrew J
    Guru 12745 points

    Hi Andrew,

    Additional question regarding Q3.
    Programmable Gain Amplifier (PGA): Is there a way to disable MIC AMP1 and MIC AMP2?

    I would like to have 0dB gain on the transmit side if possible.

    Thanks,

    Conor

  • +1 in reply to Conor
    TI__Mastermind 31985 points

    Hello Conor, 

    There is no option for 0dB gain for this device. The total TX channel gain can vary with user control from 41.5 dB to 19.5 dB. The default total TX channel gain is 23.5 dB.

  • 0 in reply to Andrew J
    Guru 12745 points

    Hi Andrew,

    By adding an external resistor 470kΩ for ATT at the red frame, the GAIN of MIC AMP1 can be 23.5dB to 0.1dB and 0.1dB can be obtained as TOTALTX GAIN. The concern would be the input offset voltage due to variations in the external resistors, though, Is it possible to use it in this way?

     

    Thanks,

    Conor

  • +1 in reply to Conor
    TI__Mastermind 48675 points

    Hi Conor,

    It's plausible, but as you mentioned the variation in the resistors would impact the offset voltage as well as the gain matching of the positive and negative sides. I think with care it is fine.

    Best regards,
    Jeff McPherson

  • 0 in reply to Jeff McPherson
    Guru 12745 points

    Hi Jeff,

    Thanks for the good information.