• RE: What's the input resistance of ADA8691?

    Hi hulala,

    Because the AD8691 is a CMOS amplifier, it should have very high input impedance. I do not think there will be any problems with interfacing this to the ADMP411. I have communicated with the engineer of this part to try and see whether I…

  • RE: ADMP441, SSM2529 Speech transmission

    This application note may be helpful for your application. It was specifically written for mic preamp applications, but is applicable for many different audio applications. You can see in here how to select an amplifier with appropriate slew rate, along…

  • About Input voltage range

    Hi there,

    I have a quesion about AD8691.


    Looking at the input voltage range of the datasheet, it says +3.9V(Max) at Vs=5V.

    And also this is  specifired at T A  = 25°C.

    I need…

  • RE: ADA4530-1 Die level option

    Hi Mika,

    We currently don't have ADA4530-1 in a die level and I'm  not sure if we will have in the near near future. However, i found these few devices with 1pA typical bias current operational amplifiers in die/chipscale package. We have AD8691…

  • RE: Specifying a driver amp for high-resolution precision ADCs

    The first thing to compare is the Signal-to-Noise and Distortion (known as SINAD) of the ADC to the distortion and noise (THD+Noise) of the op amp. You want the SNR+THD of the amplifier to be less  than (i.e., more dB)that of the ADC. For example, the…

  • RE: Switching Regulator Question


    The ADP1621 boost controller can be used as you describe for an asynchronous design (one switch, one diode) with or without isolation.

    The ADP1828 buck controller can be used as a 2 low side switch flyback if you do not need isolation.

    Here is…

  • 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…

  • AD7998

    AD7998 datasheet says that the voltage range for external reference can be any between 1.2 and VDD. I acquired an eval-ad7998 board and rewired one of the digital potentiometer to work as the external reference voltage at 1.0 vcc (my magic number). The…

  • RE: Replacing LMV84x by AD8646/8648 ?

    Hi Usaghi,

    Regarding to your first question,  you're right about Vsy and Isy. Vsy or simply Vs, is the supply voltage of the part while Isy is the supply current per amplifier of the part.

    On your second question, actually our parts has input…