AFE5801: Question about input resistance value

Zhengquan Lu

Part Number: AFE5801

Hi team,

My customer would use AFE5801 device for LMFW application. They want to know whether the input resistance value is 5kohm as below. If so, when input voltage swing is 2VPP, the input power should be 10log{[(2/(2√2))^2/5000]*1000} =-10dBm, is my understanding right? Thanks a lot!

Best Regards

Zhengquan Lu

over 5 years ago

0 Chen Kung over 5 years ago

TI__Genius 12025 points

Hi Zhengquan,
How are you?
Thank you for helping the customer using AFE5801 device.
Yes, I will look into the customer question and let you know very soon.

Thank you!
Have a nice day!

Best regards,
Chen

0 Chen Kung over 5 years ago in reply to Chen Kung

TI__Genius 12025 points

Hi Zhengquan,

How are you?

Yes, correct.

For AFE5801 device, differential input Max = 2Vpp = 10dBm.

The input impedance is high resistance 5k ohm to DC=Vcm

as you can see from the following plot from AFE5801 data sheet.

Thank you!

Best regards,

Chen

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AFE5801: Question about input resistance value