CN-0156 ,Similar to it needed Amplitude Control of Sine wave from 0.5VAC to 6VAC

Dear Sir/Madam,

I am looking for Amplitude Control of Sine wave from( 0.5VAC to 5.5VAC) with Frequency of 400Hz,

Amplitude Control thought microcontroller or thought SPI interface, 

https://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0156.pdf

The about link is Somewhat okay but, It Can give Sine wave from ( 0.1VAC to 0.6VAC) only..

Plz Help me how to Achieve Sine wave from( 0.5VAC to 5.5VAC)  which can be Amplitude Control thought microcontroller

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  • +1
    •  Analog Employees 
    on May 6, 2019 4:34 PM

    Hi pavankumarsn27,

    The datasheet for the AD9834 is indeed a bit light on signal conditioning for the output signal, but fundamentally, the outputs are two complementary current sources, with a compliance voltage of +0.6V. That is, if the output load resistance is too high such that the output voltage exceeds 0.6V, performance may be degraded.

    In order to achieve a 5.5V output, you will need a gain stage. A useful reference would be the LTC1668 datasheet - while the LTC1668 outputs sink current (vs the AD9834, which sources), the idea is the same. The LTC1668 eval board has three different output circuits that you could refer to:

    https://www.analog.com/media/en/dsp-documentation/evaluation-kit-manuals/DC2459AF.PDF

    -Mark

Reply
  • +1
    •  Analog Employees 
    on May 6, 2019 4:34 PM

    Hi pavankumarsn27,

    The datasheet for the AD9834 is indeed a bit light on signal conditioning for the output signal, but fundamentally, the outputs are two complementary current sources, with a compliance voltage of +0.6V. That is, if the output load resistance is too high such that the output voltage exceeds 0.6V, performance may be degraded.

    In order to achieve a 5.5V output, you will need a gain stage. A useful reference would be the LTC1668 datasheet - while the LTC1668 outputs sink current (vs the AD9834, which sources), the idea is the same. The LTC1668 eval board has three different output circuits that you could refer to:

    https://www.analog.com/media/en/dsp-documentation/evaluation-kit-manuals/DC2459AF.PDF

    -Mark

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