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…
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…
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…
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…
I'd like to know if there is any problem in using resistors of some kOhms as RF and RG for ADA4937 fully differential amplifier: I need a 2kOhms input impedance.
I have designed a circuit by using an ADA4937-1. I used it to drive ad AD9253-125.
As shown in the picture attached, the input is a single ended Vpp = 1,6V.
The Vcm of the ADC is qual to 0,9V but, using this voltage as Vocm for ADA4937, the signal…
I'm simulating the ADA4937 Differential Ampliifier that I will use as ADC driver for the AD9255, with and without output filter.
It seems that adding the output filter at tha ADA4937 leads to a huge distortion of the output signal.
I'll drive the 14-bit AD9255 ADC, sampling a 35MHz signal at 88MHz, with a ADA4937.
I read a couple of application notes, like AN742.
So, "the key is to make the input look as "real" as possible to achieve a good impedance match".…
The ADA4937-2 datasheet states that the ground and power planes should be cleared near the summing nodes and gives an example for the ADA4938-1:
This is a bit confusing to me because it only looks like the polygon pour on the top layer is removed…