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LMH3401: Offset adjust

Ryuji
Guru 20090 points
Part Number: LMH3401
Other Parts Discussed in Thread: TINA-TI

Hello,

If VCM = 1.7 V and Vref = + 10 mV in the circuit of Figure 54, will the following output be obtained?

Vout + = + 1.710 V = + 1.700 V (CM) + 0.010 V (Vref)
Vout - = + 1.690 V = + 1.700 V (CM) - 0.010 V (Vref).

Best Regards,
Ryuji

  • 0
    Guru 20090 points
    Hello,

    I would like to add the offset to the VCM.
    If the above method is not used, please let me know application example for add the offset.

    Best Regards,
    Ryuji
  • 0 in reply to Ryuji
    TI__Genius 15975 points

    Hi Ryuji,

    Yes, you could use the above method to add the offset to the input common mode. But, you need to be careful with the applied input offset as it will be an amplified offset at the output. So, a 10mV input offset will show up as 32mV offset at the output. You could simulate this in TINA-TI as below using DC analysis.

    Attached TINA-TI schematic for the same: LMH3401_InputOffset.TSC

    Best Regards,

    Rohit