• RE: AD8675 Input Voltage Range, Noise & LTSPICE model

    Hello ARoxas

    Thank you for your reply. I uploaded the screenshot with higher resolution, sorry for that.

    I took the headroom as the input voltage where the difference between input and output starts to increase. This is at approximately V+ - 3.5V.

    I then…

  • RE: OP270AZ

    The OP270 is a very ooooooold part;  not recommended for new design.

    I would look at using the AD8672.

    There is no current limit for the OP270, so it's a function of the output transistors.

    I would use 30-40 mA for calculations.


  • RE: SPICE model for OpAmp Noise


    Has this issue been resolved? In ADISimPE, the noise is still wrong (not matching datasheet) for AD8676.

    In LTSpice I used AD8675 for simulation because there is no model for AD8676 but the results do not match the datasheet as well.

    - Input Voltage…

  • AD8676 :input voltage exceeds the common mode voltage range


    I have a question.

    Does AD8676 will occur "phase reversal" when the input voltage exceeds the common mode voltage range within supply voltage range?

    Ex. AD8672  D/S Page 1  "No phase reversal"

    In this regard, the same as the

  • RE: Noisest Opamp?

    There two AD8512 and one AD8672 in the circuit.  This image is the first amp after the demodulator.

    I need to increase the noise below 100 Hz.


  • RE: to connect or not to connect Multiple ADA4930-2 Vocm(x) together

    Hi Ching,

    You can actually use any op amps as a buffer but I would recommend AD8542, ADA4001-2, or AD8672 because these are low noise, low input bias current op amps that suit your application.

    Also, since you need only two buffers (one for each AD9681…

  • RE: Will there be a dual version ADA4627-1.



    I wish you would have gotten a name so I could track this down further.  Was it a local field office

    or an office in Norwood?   Which department?  That is certainly unacceptable behavior.

    I was the product line apps engineer for the ADA4627-1. 

  • RE: AD9837: ignored commands

    Hi Miguel,

    I can see the same problem in both transitions (0->1 and 1->0), event though it's more likely to see the error when I switch to freq1.

    I'll check again the power supply and the grounding, but I must say the PCB follows the rules…

  • RE: 5532 1st order bandpass for electret mic preamp

    I have some questions:

    Are you able to use a 3-wire connection to the mic, or does your design require a 2-wire? The WM-60A is now obsolete because of RoHS non-compliance, I believe that the WM-61A is the compliant replacement. I have not run into the…