• Replacement for AD8672

    Hi all!!

    for building a precise and efficient Sample and Hold circuit, i found the following application note in AD website


    But the operating voltage range of the op amp used (AD8672) is…

  • 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

  • Loading between channels on AD8672?

    Im using the AD8672 on the dual op amp evaluation board to provide 2 output channels.

    Both amplifier A and B are given the same 30us input signal. Amplifier A is behaves normally as long as Amplifier B is not connected to a scope (50ohm termination)…

  • AD8672 is very easy to be damaged

    I already destroy more then 10 pcs AD8672 in my experiment.

    I just use it as a low noise unit gain buffer.

    Supply voltage are +/-12V

    IN+ is connected to the reference output from LM399.
    IN- and output is shorted to provide the negative supply voltage…

  • 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.


  • AD8672  Datasheet 上的Open-Loop Gain and Phase Shift vs. Frequency &  Output Impedance vs. Frequency 參數疑問?

    想請問一下我使用AD8672 spice model  去跑Open-Loop Gain and Phase Shift vs. Frequency &  Output Impedance vs. Frequency  這兩個參數,RUN出來的參數為何 DATASHEET上面所標示的是不一樣的,測試條件與Datasheet一樣 , 詳細測試數據在附件,thanks!!!

  • 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.


  • AD8672  Open-Loop Gain and Phase Shift vs. Frequency &  Output Impedance vs. Frequency Question?

    Hi there,

      We are using the SPICE model of AD8672 to simulate the open-loop gain & phase shift vs. frequency & output impedance vs. frequency. It turns out to be quite different from the listed in data sheet. Attached is the test result for your information…

  • 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…