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OPA2320: Comparsion with OPA2837

Jan Bock
Expert 3800 points

Part Number: OPA2320
Other Parts Discussed in Thread: OPA2837,

Hi Team, 

my customer wants to replace OPA2320 with OPA2837. What are the main differences between both parts. What has customer to care about, if he replace OPA2320 with OPA2837. 

Thanks 

Jan 

  • +1
    Guru 140200 points

    Hi Jan,

    as you want to replace a 20MHz by a 105MHz OPAmp, nearly everything changes Relaxed

    One would need to see the schematic and carry out a phase stability anlysis to see whether the faster OPAmp can be used in the original circuit. Eventually, changes have to be made to keep the circuit stable.

    Kai

  • 0 in reply to kai klaas69
    TI__Expert 3800 points

    Hi Kai, 

    the customer has already build 800 boards with the the OPA2837. Of course I saw the different bandwidth when I t compared the parts by my own. What makes the comparison even harder is, that both devices were tested under different conditions. 

    I will ask the customer for the schematic and then follow up in an internal chat. 

    Thank you 

    Jan

  • 0 in reply to Jan Bock
    TI__Guru 74911 points

    As Kai mentioned, stability for the vastly different GBW between two op amps would be one obvious concern and another could be the six-order of magnitude difference in the input bias current, (max IB of 0.9pA vs 510,000pA at 25 deg C) for OPA2320 vs OPA2837, respectively.  Also, keep in mind that the input current noise spectral density is a function of IB, Inoise = sq-rt(2*q*B), thus the OPA2837 would generate higher noise across large source/input resistance.  For all these reasons to say anything more, it would be necessary to see actual schematic.