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TLV320AIC3254 interface to TMS320C5515

Nandakumar MReddy
Prodigy 195 points
Other Parts Discussed in Thread: TMS320C5515, TXB0108, TLV320AIC3254, TXB0106

Hi,

We are using TLV320AIC3254 CODEC in our application. I am interfacing this CODEC to TMS320C5515. My TMS320C5515 IO lines are operating at 1.8V and my TLV320AIC3254 IO lines are operating at 3.3V.  So I am using TXB0108 level translator in between for the interface.

Now my issue is TXB0108 needs an driving strength of ±2 mA at its input lines. So does TLV320AIC3254 support the IO drive strength of ±2 mA?

If not then how do i mitigate this issue.

Kindly help me our in this issue, As of now we are in layout design design. I need to finalize it immediately

Regards

Nanda Kumar M

  • 0
    TI__Guru**** 189401 points

    Hi, Nanda,

    Why don't you just run the TLV320AIC3254 with its IOVDD=1.8V so you don't need the level translator?

    According to the d/s on page 12, the outputs are able to drive the load of two TTL devices. I believe those are typically around 1.6 mA, so the chip can drive 3.2 mA should you choose to use the translator route.

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 195 points

    Dear Don,

    Thanks for the reply. We were really worried for this. Because it CODEC dint support 2mA drive strength then it migth have screwed up my entire design. I am thank full for your solution to my issue.

    We cant go ahead with IOVDD of 1.8V because MIC bias we are expecting 3.3V swing which is intern dependent on IOVDD. If we use IOVDD as 1.8V then MIC bias volatge swing will become 1.8V , which could not meet our requirement.

    And also we are using pre amplifier circuit which will be operating at 3.3V so this MIC in to CODEC will be of 3.3V.

    That is why we are going for IOVDD of 3.3V.

    So will their be any issues for the current design with using 3.3V IOVDD and converting down to 1.8V using level translator TXB0106?

    Hope fully it should not give. But please confirm on this.

    Regards

    Nanda Kumar M

  • 0 in reply to Nandakumar MReddy
    TI__Guru**** 189401 points

    Nandakumar,

    According to the information I have, this will be fine.

    -d2