• RE: LTC6409 DC-Coupling

    The LTC2158 has a common mode voltage of 0,8V (0.783V to typical), the amplifier needs to provide that or else you will need to provide blocking caps and pull up resistors to provide the ADC with a proper common mode voltage.  The input of the LTC6409…

  • RE: LTC6409 resistor calculation

    I agree with you

    have you ever checked DC2266A document from LinearTech?


    please just look at page 3:

    is it possible above statement…

  • RE: Spice models or S-Parameters for LTC6409 and LTC2208

    IBIS models only model the digital I/O lines.   We have s-parameters for the LTC2208, email me and I will send them to you, it isn't letting me upload it here, If you want a spice model of the LTC2208 front end use the equivalent circuit in the datasheet…

  • DC2266A 16-Bit, 210Msps ADC FMC reference design and Linux drivers.


    Has anyone modified any of the ADI reference designs or created the Linux drivers for the DC2266A?

    LTC2107 and LTC6409.

    ZC706, ZCU102, KC705, KC102, Arria 10 SoC, Arria 10 GX or Zed.

    Thanks in advance. 

  • RE: anti aliasing filter for an ADC

    The AD9248 has a common mode voltage that is 3.3V/2 = 1.65, the LTC6409 can easily provide that and do a gain of 10 and do a single ended to differential conversion.  


    The filter you have picked out from mini circuits should be ok, but only before the…

  • Improving Linearity by Using Absorptive Filters

    When driving a direct sampling high speed ADC, the most likely place to degrade the performance is the interface between the final amplifier and the ADC.  With any direct sampling ADC there will be nonlinear charge produced in the sampling process. This…

  • RE: RE: AD8302 phase measurement

    The input range of the DC1945 is 62mV to 125mV because of the gain of the LTC6409.  If you reduce the gain of that amplifier by changing the feedback resistors you can get a higher input range. The input range of the ADC itself is 2Vpp or 1Vpp depending…

  • RE: AD9744 output bias voltage

    1.55 V is larger than 1.25 V. The voltage on either DAC output cannot at any time go above 1.25 V. For the best distortion performance it is best if the voltage never exceed 1.0 V. The smaller the voltage swing on the outputs the better.

    I can't help…

  • AD8039 noise issue

    In this project, we used Linear's high speed ADC LTC2175, LT6409(SE~Difference) as the driver. AD8039 as the first level amplifier and follower. Signal input Range: ±0.5V~±5V (i.e. Gain: 1~10); Input Freq: DC~60 MHz; When the input signal of AD8039 connected…

  • ADI工程师博客分享——利用吸收式滤波器提高线性度

    作者: Clarence.Mayott

    驱动直接采样高速ADC时,最有可能降低性能的地方是最终放大器与ADC之间的接口。任何直接采样ADC都会在采样过程中产生非线性电荷。每次采样开关闭合时,此电荷就会反射到输入网络中。如果不加以衰减,它会反射回ADC且被重新采样,致使ADC的失真或交调失真性能下降。ADC的输入网络应尽可能接近50 Ω,以便最大限度地吸收此非线性电荷。使用高吸收性滤波器可抑制采样过程中产生的非线性信号音,从而改善SFDR。