AD698: FAQ

  • AD698 becoming hot

    Question When powered with +/-15V the AD698 becomes hot, is this normal? Answer The AD698 does gets quite hot in general. The temperature is dependent on the output current to the LVDT. If drift over…
  • AD698 power supply current calculation

    Question What do you mean through Load and Excitation output current? The datasheet noted Load output current is 11mA, Excitation output current is 50mA rms. The total power supply current to be…
  • AD698 Supply Voltage versus Output Voltage

    Question I would like to supply ±7.5V in order to achieve ±4V on the output. This is in relation to the data on page 2 of the datasheet which states that with a supply of ±13V you can achieve ±10V…
  • AD698: 6 wire sensor connection

    Question I am planing to do a distance measurement system using LVDT E100 series from schaevitz and using AD598 or AD698. I want measurement accuracy of 1 microns. please suggest me a good LVDT signal…
  • AD698: Lead/lag pins

    Question I have Used AD598 for many years but as the LVDT coils are not linear I have switched to AD698 in conjunction with the data sheet. I have not fitted any components for Lead/Lag and get not…
  • AD698: Maximum input at A and B input

    Question I am using the AD698 LVDT signal conditioner. Datasheets say maximum input at A and B input channels is 3.5Vrms. Is this value the differential voltage between the - and + input or is it the…
  • AD698: phase lead / phase lag compensation

    Question When the phase shift value is -4, how to decide which network should be use, phase lag or phase lead? For example: when the phase of –ACOMP is faster than ACOMP, we should use the phase lag…
  • AD698: Power supply

    Question I have a question to the AD698. To reduce the power dissipation we like to supply this device with ±12V. The output voltage is ±5V with a exc. voltage of 2.2V rms. Is for this ±12V good enough…
  • AD698: Power supply +/-12V

    Question Is it possible to operate the AD698 from a +/- 12 volt supply as it states the minimum DC dual supply should be +/- 13 V in the data sheet and if so are there any compromises in the performance…
  • AD698: R3 calculation error in datasheet phase lead phase lag compensation

    Question On the AD698 datasheet, page7, Equation (2), When Vos=5V, R4 is open, R2 is 41.7 for VOUT 0~10V In terms of Equation (2), the R3 should be 8Kohm. But R3 is 7.02Kohm in datasheet. There is…

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