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OPA314 XRef lower Iq

LeonardEllis
Guru 71516 points
Other Parts Discussed in Thread: OPA314, TLV314, LMV651, OPA341, TLV2422

The OPA314 is designed into a strain-gauge monitor and performs to the requirements, however, the Iq is too high. Would like a drop-in replacement wit lower Iq, and the following characteristics:

  • GBW 1.5MHz>3MHz
  • Total Supply Voltage 2V
  • Noise <14nV/sqrt(Hz) at 1kHz
  • Internal RF/EMI filter
  • -40C > 125C operating
  • and the most difficult(?) Iq < 150uA

Using the COMPARE function on the OPA314 page, I have not found any other device to meet these requirements, the TLV314 comes close.

Am I missing something, or there is not a device that will meet these requirements?

  • 0
    TI__Mastermind 49856 points

    Hi Leonard,

    Do they really need 1.5MHz BW for a strain gauge?? What is their gain and expected signal BW?

    BW and Noise are going to impact supply current severely.  Biggest reduction in supply current will be BW, though low power devices will be nosier.

    Usually Strain Gauge apps are more concerned about noise and offset.

    If the strain gauge impedance is low, and they do need the BW, see the LMV651. Also the TLV2422 and OPA341.

    Regards,

  • 0 in reply to Paul Grohe
    TI__Guru 71516 points

    XRef must be pin-compatible with the OPA314 as the product is already in production - must be a drop-in.

    The TLV2422 is a dual device, so this won't work.

    The OPA341 has an Iq 5x greater, so this won't work.

    The LMV651 is not pin-compatible.