LTC6268 input current for TIA application.

Hello AdamShiau,

As indicated on the part's data sheet, the input current should be limited to less than 1mA. Having input currents of around 2-3mA can potentially damage the part.





Though may I ask, when you have chosen LTC6288, what are the key parameters/specifications that you have considered? Depending on those specs, maybe we can recommend another ADI part with a higher input current rating that will suite your application. 

Thank you,

Best regards,
Paul

Hello AdamShiau,

As indicated on the part's data sheet, the input current should be limited to less than 1mA. Having input currents of around 2-3mA can potentially damage the part.





Though may I ask, when you have chosen LTC6288, what are the key parameters/specifications that you have considered? Depending on those specs, maybe we can recommend another ADI part with a higher input current rating that will suite your application. 

Thank you,

Best regards,
Paul

Hi Paul,

Thank you for the reply.

In our application, we are concerned with the current input range from the photodiode (0.2 to 2.5 mA) and low bias current (to ensure low DC error when there is no light). A bandwidth of several hundred MHz is sufficient, and the output range of the TIA is 0 to 4.2V.

Thank you.

AdamS

Hello AdamShiau,

Based on your application and requirements, AD8065/AD8066 looks the suitable part for you. You can check the part's data sheet for more details. Here is the link to the part's data sheet: AD8065/AD8066 (Rev. L) (analog.com)

Best regards,
Paul