I need to make a laser driver that can give current output from 0 mA to 250 mA. I checked ADN8810 datasheet and found the recommended circuit with 2 resistors (Rsn) which are having value written over them as 1.6V (instead of ohm/kohm). Is this a typo?

Also I need to ask whether the recommended circuit shown is to get 300mA only or the circuit connection stays the same for smaller current values as well?

Dear Rohan09,

Firstly, sorry about the typo. The Rsn = 1.6ohm should be the correct ones in Fig. 1 of ADN8810 datasheet.

We have noticed these typos and is working on the datasheet revision to fix these typos.

Secondly, with the same Fig. 1 circuit configuration, the full scale current could be determined by the equation (1). In the equation two factors: Rsn & Vref would result in the expected full scale current. For example, if you have a Vref = 2.048V, Rsn = 3.7ohm, the resulted full scale current would be about 55.4mA. This leads to LSB (resolution) --> 55.4/4096 = 13.5uA. Or Vref = 4.096V, Rsn = 7.4ohm, you would get the similar full scale current 55.4mA.

In general, we recommend a 4.096V as the Vref input.

In case you have any further proprietary questions about ADN8810 application, please feel free to send your questions

to dongfeng.Zhao@analog.com or continue our open discussion here in EZ.

Best Regards,

Dongfeng