Difference between uncommitted Op-Amp (25mA) and the Op-Amp used for PGA/TIA in PSoC 3/5

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    Question: What is the difference between uncommitted Op-Amp (25mA) and the Op-Amp used for PGA/TIA in PSoC 3/5?

     

    Answer:  

    The difference between these two Op-Amps are specified in the table below. The Op-Amp used for PGA/TIA is suitable for higher frequency operations like mixers. The uncommitted Op-Amp (25mA) has higher drive strengths hence is more suitable for buffering kind of applications. The uncommitted Op-Amp (25mA) also has a very small offset over Voltage and temperature making it a good fit for signal conditioning at low signal voltages.

     

                                                                                                 
       

         Parameter

      
       

         PGA/TIA Op-Amp

      
       

         Uncommitted Op-Amp (25mA)

      
       

         Drive

      
       

         250uA

      
       

         25mA

      
       

         Unity Gain-Bandwidth

      
       

         7Mhz

      
       

         3Mhz

      
       

         Routing

      
        Routed through the analog globals hence high resistance connections   

         Has dedicated input and out connections hence low resistance connections.

      
       

         Offset

      
        +/-10mV    +/- 2mV