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OPA835/OPA890

eli
Guru 13485 points
Other Parts Discussed in Thread: OPA835, OPA890

For ADSL2+ application,customer used the OPA835,but in order to get better THD, higher P/S range,they intend to move to OPS890.

Is this is the right/best recomended solution?

  • 0
    TI__Genius 13335 points

    Eli,

    You are correct. The OPA890 can run at +/-6.5V or about ~13V max supply whereas the OPA835 is limited to 5.5V max. This is a result of using the CBC10 process versus BiCom 3x.

    For THD, the OPA890 is not Rail-to-Rail Output which means it will inherently have improved distortion over RRO devices. The OPA890 also has a higher Iq than the OPA835 (1.1mA versus 250uA) which will result in better all around performance.

    Overall, the OPA890 is a good option for improved THD and higher supply range.

    Regards,
    Luke Lapointe
    High Speed Amplifier Applications