• AD8336_AN934 bandwidth change

    In Application Note AN-934 "60 dB Wide Dynamic Range, Low Frequency AGC
    Circuit" the circuit has output level flat over the audio frequency range of 20
    Hz to 20 KHz. What changes are required in the circuit to get flat output level…
  • AD636_figure 17 input floating noise filtering

    One customer has two questions regarding the figure 17 in AD636 datasheet. 1.
    He said if there is no Vin connected, there will be interference coupled on
    10Mohm R1~R4. He would like to know that whether we have a solution to avoid
    the…
  • AD737 AGC Bandwidth

    In Application Note AN-934 "60 dB Wide Dynamic Range, Low Frequency AGC
    Circuit" the circuit has output level flat over the audio frequency range of 20
    Hz to 20 KHz. What changes are required in the circuit to get flat output level…
  • RE: RMS and peak limiters, latency/look ahead

         Hello Kim and Dave,

         The IIR filter's b1 coefficient works out to about 2^(-35).  This is way too small to represent in any SigmaDSP, which are 5.23 or 8.24 fixed point (double-precision refers to the calculations, not the coefficients).  I'm not…

  • A Poor Engineer's Distortion Analyzer

        Yes, there are poor engineers.  Where I work audio is a sideline, so we do not yet have a dedicated distortion analyzer.  I've been toying  with buying a used one on eBay, but it's interesting to see what can be done with just a ADAU1701 evaluation…

  • RE: sigma studio sub harmonic synth documentation missing

        Hello Ben,

         I'm afraid that what you're saying about the documentation is substantially true.  ADI stopped updating SigmaStudio's built-in help files some time ago in favor of the wiki, yet even this has fallen behind.  I suspect there's several…

  • RE: Adaptive Loudness

         Hello Lu,

         By "simpler," do you mean, "fewer instructions?"  And is your DSP the ADAU1701?  If the answers are "Yes," the circuit below, while appearing more complex than the one you found, saves many instructions.  Here…

  • Low Noise Variable Gain AD600 Amplifier

    Hello,

    I, Satyabrata Sarangi, am using AD 600 in a cascading mode to get 80 dB gain. The problem i am facing is always i am getting an amplified output, with a larger bandwidth. If the original signal is of 1 MHz, i am getting a 25-30 MHz signal as output…

  • Output of AD8436

    Hi everyone,

    we are designing a true rms circuit using the AD8436 (see attached pdf).

    The Circuits uses a wide input range of AD8436 to measure input voltages from 0-250V RMS with different input frequencies  An external opmamp circuit adjusts the values…

  • What is an rms-dc converter?

    An rms-dc converter is a special linear circuit that computes the rms (i.e. heating value) of an ac waveform to an exact dc voltage having the same value