• ADA4895 spec question

    Trying to ascertain the true Gain Bandwidth Product on this device - the closest the data sheet comes to that seems to be on page 21 talking about transimpedance design - there does not appear to be a number given there or anywhere - and no, the min gain…

  • ADA4895-1 output noise

    I would like a sanity check on my noise calculation and the actual result and any other comments.

    Two ADA4895-1 op-amps in series each with a non-inverting gain of 10x. Rf = 226 ohms. Rg = 25.1 ohms, Rs = 51 ohms.

    They are followed by an AD8021 with…

  • ADA4895 Distortion vs Vout

    I'm designing a Lock In amp which after processing will have a bandwidth of 10Hz - so the noise floor is very low ~40nV RMS (heavy loading by feedback network obviously) at ADA4895 output, G=10.  It is therefore important to know how the distortion…

  • ADA4895 Distortion in dBc to %

    I am having difficulty converting your distorsion specification from DBc to
    percentage (%), for example -96dBc.

     

    The following Analog Dialogue article may be of use, it explains some Amplifier
    Distortion
    Specifications:
    http…
  • ADA4895-1易坏

    使用ADA4895-1ARJZ时,负载约1k欧,反向放大,系统电源±6V,正负电均串联51欧(150欧)后给运放供电。经常发现器件损坏,而且是运放电源被拉至±1.2~±2V左右,而正常工作时运放电源约±5.4V。

    请问容易坏的原因是什么,改进方法除了单独用±5V还有吗?

  • ADA4895 SPICE model accuracy

    Hi,


    The open loop response I'm getting from the ADA4895 SPICE model does not look very realistic when compared to the datasheet.  Besides the dominant pole all I see is a single pole-zero pair around 1 GHz giving a phase dip down to about -145 degrees…

  • RE: whether negative supply on pin -Vs required for ADA4895-1?

    Thanks for the reply. I undershoot that total supply voltage (+Vs)-(-Vs) will decide the closed loop gain , not the dual supply voltage.

    This circuit is transimpedance amplifier ADA4895-2 with photodiode as input.

    First image - Gnd is connected to -Vs…

  • ADA4895-1的问题

    问题描述:

    1、批次1917的芯片都不能用。

    TEST2的波形图如下所示。在超声波信号到来的一段时间(将近33us内),波形是一条直线。33us后,噪声陡增。或者不放大超声波信号。

    2、老的批次基本可以用。

    请问这种现象是因为芯片的原因还是使用的原因造成的?

  • ada4895-1的问题

    原理图如上图所示。

    问题描述:

    1、批次1917的芯片都不能用。

    TEST2的波形图如下所示。在超声波信号到来的一段时间(将近33us内),波形是一条直线。33us后,噪声陡增。或者不放大超声波信号。

    2、老的批次基本可以用。

    请问这种现象是因为芯片的原因还是使用的原因造成的?

  • RE: Using ADA4895-1ARZ to amplify 1MHz FPGA GPIO 3.3V PRBS signal output distortion

    Hi,

    I think the ADA4895 could not meet your requirements.
    As mentioned, the ADA4895 need a gain of 10 or above to be stable.
    Aligned to this gain, is the Gain Bandwidth Product (GBP).
    ADA4895's GBP is 236MHz. At the gain of 10, your available bandwidth will…