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

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