• AD8648: FAQ

    FAQ

  • AD8648: Current Noise Density

    Q 

    To perform a Noise-Analysis we need the Current Noise Density of the AD8648ARZ.
    Unfortunately this value is not available from the datasheet.
    -        Can you please help to provide this value?

     

    A 

    The AD8648ARZ has a very low Input Bias Current…

  • RE: 4-ch low noise opamp

    Hi EZ team, I would also like to check input noise current density specs for these two parts. Many thanks!

    1. ADA4891-4

    2. AD8648

  • RE: Replacement for MCP6004

    Hi wbadry,

    What is your source impedance in this configuration where you replaced MCP6004 with LT1679 and got higher noise reading?

    If your input impedance is "high", you'd want to choose a device which has low current noise density. LT1679 input current…

  • RE: High frequency noise at the output of a 4th order filter

    FormerMember
    FormerMember

    HA,

      A quad is not four op amps in one package, it is four functions in one piece of silicon.  At high 

    frequencies, you have coupling with stray C to substrate, through the bond wires, between

    the traces on the pc board, etc.  If you have capacitance…

  • RE: ESD Tolerance

    FormerMember
    FormerMember

    Acryl,

      The AD8648 meets AEQC-100.  It passed HBM ESD on all pins at 1kV.

    You said:  "I can´t use a surge protection on the output of the opamp"

    Did you really mean output or input?

    Harry

  • Replacing LMV84x by AD8646/8648 ?

    Hi,

    We are now studying to replace LMV84x on existing system by AD8646 or AD8648, then having questions as follows.

    1) Absolute Maximum Ratings of input voltage at AD8646/8648 is defined as "GND to Vsy".

      I could not find any clear definition…

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  • RE: 【求助】ADMP401 加运放ADA4897-1 电路  Vref取值问题？

    您好。

    REF的值主要取决于后端运放的供电范围以及要放大的信号增益。具体计算可以参考ADI应用笔记AN1165  Supply Voltage一节。

    • AN-1165.pdf

  • Noise optimizing AD8599 &&

    Good day,

    I have a task to optimize noise in BW 10Hz - 10kHz.

    Voltage gain shall be around 20..50. OA connected directly to source of signal,

    which has impedance 1kOm DC and 50Om AC. OA connected to middle point of R1/R2 divider,

    where R1 connected…

    • LowNoise_OA_selection_AN-940.pdf