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LPC662: Migrating to LMC6082 or TLV9102

Jason Haedt
Expert 4090 points
Part Number: LPC662
Other Parts Discussed in Thread: LMC6082, TLV9102

Hello,

My customer has to redesign the circuit using LPC662 to LMC6082 due to the EOL issued.  From the PCN it doesn't get much detail on electrical differences.  Has your team done a detailed analysis that I can review?

LPC662 (existing part) datasheet says it’s specified for 5kΩ and 100kΩ loads

LMC6082 (proposed parts) datasheet does not specify this but specifies an output swing at 100kΩ loads.Is the LMC66082 not suited for 5kOhm loads?  

In addition, when I go on TI.com the recommended replacement is TLV9102.  Can you confirm what is the best form fit function replacement?  The formal PCN and TI.com disagree:

https://www.ti.com/compare-products/?id=1562&type=GPT&mode=alternate-gpn&partList=LPC662,TLV9102&sticky=true 

  • +1
    TI__Mastermind 28796 points

    Hey Jason,

    There are a couple ways you could do this comparison.

    There is the selguide tool, available here. There is a tool I will message you directly about, or there is the comparison you have already linked.

    LMC6082 will work for 5k loads. You can see in the typical characteristics that they tested Aol across several loads.

    The omission in the datasheet is just that the devices were tested to different standards. Just because a load condition is not specified does not mean the amplifier will not work at all at those loads, it just means that the parameters may be a little different than the datasheet specifications. The specified load/gain conditions just give a baseline to measure against.

    TLV9102 is a comparable device, and is on a 300mm process, but is higher bandwidth, and as such consumes more current. Depending on the customer application this may not be acceptable.

    What are the key specifications for the customer (Iq, supply voltage, bandwidth, RRIO)? There is not necessarily an exact match of that device that is equal but newer.

    Best,
    Jerry