Hello,

My customer will use ADA4937-1 and AD9258 at repeater application.

1. Input voltage range of the Vocm pin in the ADA4937-1 is min 1.2V to max 3.8V. However, the VCM output of the AD9258 is 0.9V.

    The voltage ranges between the Vocm pin and the…

Hi there,

My customer is designing ADA4937-1 to drive AD9284 for his project. He follow AD9284-250EBZ schematic design, however there are some questions.

1) In EVB circuit, ADA4937-1 IN+ & IN- are swapped compared to Fig19 in AD9284 DS. Is there any…

Trying to run simulation on ADA4937 with Diff-Amp Calculator, and no matter what the input or gain is, it thinks the input is clipped. What's going on?

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…

Hi,

My customer wnats to get your advice about their schematic with AD9251-80 and ADA4937-1.

They used AD9251-65 and ADA4937-1 in their system, but now they will change the sampling frequency of their system.

So they need your help.

The sampling frequency…

我的电路图如上图所示，其中ADA4937-1输出端的电阻应该是0欧姆。

两个运放电路一模一样。

我现在的问题是，不供任何信号，就这样的电路，加上电后，频谱仪设置为0-100MHz，幅度为-120~-20dB。

这个时候就可以看到，70MHz附近会有个一些信号抬起来。大概比噪底-70dB提高5dB左右。

实在找不到原因。

另外还有一个问题。调制器IQ数据的滤波电容改成560pF对100MHz带宽数据有没有影响？

Could anyone explain what 3NS means on part numbers such as LTM4650AIY-1#PBF vs LTM4650AIY-1#3NSPBF ?

I cannot find any information.

thank you

HI.

I have a question about some code in BATImpedance.cpp.

------------------------

AD5940_WriteReg(REG_AFE_SWMUX, 0);

or 

AD5940_WriteReg(REG_AFE_SWMUX, 1<< 1);

-----------------------

In the datasheet REG_AFE_SWMUX  (0x0000235C)

[2:0] reserved ,