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LF356 ; photodiode ; single supply opamp for photodiode

VT
Genius 3300 points
Other Parts Discussed in Thread: LF356

1. I have opened a board in which photodiode(unknown) is connected to LF356. LF356 datasheet says it require minimum +-15V, but starngely in board it is +-5V. How does it work?

2, I am planning to interface photodiode BPW34. Now my system has only single supply +3.3V & ground. Is there any amplifier for this? Accuracy is not much concern here, cost is. 

  • 0
    TI__Mastermind 49946 points

    Hello Vindhyachal,

    The LF35x devices can operate with supplies as low as 8V (±4V), but it is not recommended to go lower due to the limited output swing and lower common mode range. ±5V is a commonly used supply, as long as Rail to Rail output is not required.

    There are many variations and options for a photo diode circuit. Can you share your existing or planned circuit? There are many devices that can be used at 3.3V, but we need to narrow them down a bit.

    Regards,

  • 0 in reply to Paul Grohe
    Genius 3300 points

    Hi Paul,

    Somehow missed your reply.

    Attached find the ckt which I traced from a working board. It is working if made on general purpose board. I am using +-5V supplies, currently. Do you think this ckt is ok? 

    photodiode.pdf