LMH7220: Input impedance

Albert Wai Kit Lau

Part Number: LMH7220

Hello,

I would like to ask what is the input impedance of LMH7220 on both positive and negative input?

I am trying to use it in a 50ohm matched system.

Best regards,

Albert

0 kai klaas69 over 3 years ago

Guru 140200 points

Hi Al

Albert,

the differential input resistance in the differential input voltage range -0.5V...+0.5V can be estimated from figure 4 of datasheet:

Rdiff ~ 4V / 12.5µA = 320k Ohm.

Kai

0 Jonathan Nguyen over 3 years ago in reply to kai klaas69

Thanks as always Kai.

Albert, Please use the figure as Kai has shown above and use Ohm's law to calculate the input impedance.

Regards,

Jonny

0 Albert Wai Kit Lau over 3 years ago in reply to kai klaas69

Dear Kai and Jonny,

Thanks for answering my question.

Best regards,
Albert

Amplifiers forum