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TLV9354: main contributing factor for the high distortion figure

Marvin Cantos
Expert 5705 points
Part Number: TLV9354
Other Parts Discussed in Thread: TLV9364, OPA1679

Hi Team, 

Good day. I am posting this inquiry on behalf of the customer.

"I was thinking of using the TLV9354 part in a circuit where low sensitivity to temperature in regards to input voltage offset and input bias current is required, and this part seems to achieve that quite well for its price, however, I also noticed it has a fairly high THD (Figure 6-21 in the datasheet). In section 7.3.6, it is mentioned that certain parameters (including THD) may suffer for common-mode inputs near the positive rail, so I was wondering if this is the main contributing factor for the high distortion figure, in which case I could still use the part since it will not operate in that region. In any case, I would be grateful if you could point me toward another part in a similar price range that can outperform the TLV9354 in terms of distortion that can be powered from a +/-12V supply (I am aware of the TLV9364, but it seems to have higher input bias current variation in relation to temperature)"

Please help to advise. Thank you for extending your help.

Kind regards, 

Marvin

  • 0
    TI__Mastermind 20402 points

    Hey Marvin, 

    Figure 6-21 on the TLV9354 datasheet shows the typical THD+N of the device (not just at the worse region). 

    I suggest looking at the OPA1679. Here is side by side comparison of the THD=N v Freq: 

    TLV9354 is on left and OPA1679 is on the right: 

    Here is the input bias current vs temperature comparison: 

    I saw a number of devices that had a better THD+N than the TLV9354 but none in which the IIB v Temp compared (all similar logarithmic curve similar to TLV9364). 

    All the best,
    Carolina