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Original question:

LM13700: Terminating unused OTA

LM13700: What is function difference between LM13600 and LM13700.

Kazuya Nakai59
Guru 20610 points
Part Number: LM13700

 Hello guys,

 One of our customers is looking for TI device which can NJM13600 with because the competitor device will be EOL soon.

 NJM 13600/13700 datasheet

https://www.njr.com/semicon/PDF/NJM13600_NJM13700_E.pdf

 I think TI has LM13700 only now because LM13600 was obsoleted.

 Can LM13700 be used for NJM13600 replacing?

 I noticed that LM13700 block diagram is different from LM13600 schematic diagram. (I attached LM13600 datasheet.)

 In LM13600 schematic diagram. Q13 base is connected to Q3 collector. But in LM13700 case, it is no connection.

 What does this connection happen? Is it for higher speed operation of Buffer Output? Is ny AC characteristic different between LM13600 and 13700?

 Your reply would be much appreciated.

 Best regards,

 Kazuya Nakai.

/cfs-file/__key/communityserver-discussions-components-files/14/LM13600.pdf

  

  • 0
    Guru 140200 points
    Hi Kazuya,

    it's said that the difference is marginal in the most cases and that the LM13700 is offering superior performance in audio applications.

    But without knowing your circuit, I would recommend to run some tests with the 13600 and 13700 by yourself and find out if the LM13700 can be used.

    Kai
  • 0 in reply to kai klaas69
    TI__Guru*** 144706 points
    Kazuya,

    The extra connection in LM13600 has two main effects.
    It increases the buffer input current needed on pins 7 & 10.
    It allows buffer input transistor to turn off faster. Useful for square wave, 'digital' applications.
    This difference only affect the Darlington buffer.

    While Darlington buffer is useful, the output current on pins 5, 12 is ready to pass to a transimpedance op amp amplifier for gain and buffering. I prefer this because there is no output offset voltage and LM13700 output voltage doesn't move which should improve THD.
  • 0 in reply to Ron Michallick
    Guru 20610 points
    Hello Ron and Kai,

    Thank you very much for your reply.

    I understood!

    Thank you again and best regards,
    Kazuya Nakai.