• AD9251-40 的差分时钟问题

    在使用AD9251-40 做FPGA 控制采集时候发现由ADC采集上来的信号有非常大的串扰,怀疑是ADC差分时钟的问题。所用FPGA 型号是EP4CE40F23I7, 采用方式是直接用FPGA IO 口产生LVDS差分时钟输出给ADC,请问一下各位高手这里是否会出问题

    现在时钟频率是20M

  • 关于AD9258/AD9251的部分数据位不输出的问题


    故障现象:

    a、项目中使用AD9258-105芯片,上电默认不进行任何配置时,通道A或通道B的某些位没有输出(特别是低几bit,比如D0~D5。具体是哪些位,无规律),电压固定在0.2V左右;

    b、个别板卡又工作正常;

    检查步骤:

    1、怀疑芯片焊接问题,于是取下重新焊接。重新焊接后,无输出的几个bit可能会有所改变,也可能故障依旧;

    2、更换AD9251-80芯片,也可能会出现部分低几个bit无输出的现象(明显感觉,AD9251-80芯片所有bit都能输出信号的可能性大的多);

  • 哪里可以查到所有ADC的Chip ID

    我在调试双通道14bit 的AD9251-80时遇到如下问题:当读取Chip ID寄存器时,读到的器件编号为0xa3,实际上AD9251的Chip ID是0x23,有人遇到过这个问题吗?0xa3是哪个型号的CHip ID?哪里可以找到?求助!(ps:基本可以确定程序没有错误,读出的Chip ID的确就是0xa3)

  • RE: HSC-ADC-EVALCZ: EXTERNAL SYNC I/O

    Hi,

    Thank you for your interest in AD9251.

    The FPGA program that is released for AD9251 does not output clocks on J5 and J7. Is it the ADC sampling clock that you want to use for other circuits?

    The sampling time of the AD9251 is determined by the…

  • RE: AD9231 output data multiplexed configuration

    Hi Nail,

    Thank you for your interest in AD9231.

    There is more information on the output multiplex mode here: AD9251 interleaved output mode . This is for the AD9251, but the information is applicable to AD9231.

    Please let me know if you need more information…

  • Request Schematic Review about AD9258-125 and ADA4937-1

    Hello,

    My customer request your confirmation about their schematic.

    They used AD9251-65 and ADA4937-1 to LTE ICS Repeater.

    But now they want to change ADC from AD9251-65 to AD9258-125.

    As you know, these two devices are pin compatible, so they want…

  • RE: Input Resistance

    Hi,

    Thank you for your interest in the AD9204.

    Please refer to the AD9204 page on analog.com . Scroll down to the "Tools & Simulation" section. There is a link to a file named "AD9204/AD9231/AD9251 S-Parameters". This file contains…

  • PN sequence for ADC & DDC ?

    I am working with the AD6636 (DDC) and AD9251 (ADC) , both of which have a PN sequence generator, usually used for BIST purposes.

    I am interested in vaildating my raw data streams from these devices when they are outputting the PN streams,

    Can anyone…

  • RE: 有关AD输出数字口的阻抗

    Hi,

    你好,

    不反对你说的22ohm的作用,但是对于某些像AD9251的芯片来说,AD输出数字线需要串接220 ohm,这恐怕不能构成串联端接?

  • RE: Who can sell me / give me an AD9248 Evaluation Board

    Hello,

    The AD9248 is an older device released back in 2005.  While we still sell the IC itself we no longer sell the EVB due to low demand for new design-ins on this device.  The AD9251 would be a functional replacement for the AD9248 and has an EVB available…