Hello,

I've got some doubts regarding the AD9272 design. All my questions are on the attached schematic file.

I would appreciate for the suggestions.

Best Regards,

Mariusz

Hello,

I've got some doubts regarding the AD9272 design. All my questions are on the attached schematic file.

I would appreciate for the suggestions.

Best Regards,

Mariusz

Hi, I came across your post and let me try to answer your questions below.

1- The coupling caps can be either 10 or 100 nF but we use 10 nF on our eval boards just fine but they just need to be the same value.

2- R2 calculation using formula 2 is correct based on the target input impedance. R3 can be enabled using register 0x2C to add more options for input impedance. When R3 is enabled then formula 2 can use R2||R3 when calculating the input impedance. This feature is useful to allow 3 different input impedance settings (R2, R2||R3, or open circuit with no termination) to fit multiple probe impedances.

3- BAS404 diodes can be used here but shotkey diodes will be better.

4- I am not sure about R1 and I assume it is up to the specs of the pulser.

Thanks

Ashraf

Hi, I came across your post and let me try to answer your questions below.

1- The coupling caps can be either 10 or 100 nF but we use 10 nF on our eval boards just fine but they just need to be the same value.

2- R2 calculation using formula 2 is correct based on the target input impedance. R3 can be enabled using register 0x2C to add more options for input impedance. When R3 is enabled then formula 2 can use R2||R3 when calculating the input impedance. This feature is useful to allow 3 different input impedance settings (R2, R2||R3, or open circuit with no termination) to fit multiple probe impedances.

3- BAS404 diodes can be used here but shotkey diodes will be better.

4- I am not sure about R1 and I assume it is up to the specs of the pulser.

Thanks

Ashraf