ADN2820 Question

Question

Dear Sir/Madame 
 I would like to use your TIA ADN2820 with an photo-diode. The functional block diagram proposed in Figure 1. of datasheet has the anode of photo-detector connected with input pin (IN). However, I have only access to cathode of our photo-detector and the anode is directly connected to ground. Can be this request satisfied using your TIA ADN2820, having the photo-diode correctly biased and respecting all the chip specifications? If not, may Analog propose other TIA? 
 Yours sincerely, Carlos Ferreira

ADIApproved · Accepted Answer

Dear Carlos, 
 What is the max. data rate you target to support upto? 
 Could you share me your selected photo-diode datasheet for a review? 
 Which ROSA package you would like to bond this TIA and your photo-diode to, butterfly or TO-46, for example? 
 In general, ADN2820 supports common cathode photo-diodes. 
 However, the TIA IN pin voltage is clamped by an internal +0.85V. So, if this is a good reverse bias voltage 
 to your photo-diode, you are welcome to try your common anode photo diode. Of course, when do this, 
 you can not copy Fig. 1 circuitry directly. 
 Best Regards, 
 Dongfeng)

Partner Forums

Partner Libraries

ADN2820 Question