Planning to use AD8609 for pH application, which needs an amplifier with very high input impedance and low bias current. Couldn't find the impedance information in AD8609 datasheet.
AD8609
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The AD8603/AD8607/AD8609 are single/dual/quad micro-power rail-to-rail input and output amplifiers, respectively, that feature very low offset voltage...
Datasheet
AD8609 on Analog.com
Planning to use AD8609 for pH application, which needs an amplifier with very high input impedance and low bias current. Couldn't find the impedance information in AD8609 datasheet.
Hi Hasan,
I cannot provide an exact value, but it should have an input impedance in the Gohm range. I will check whether this has been measured before.
We have a good reference circuit that you might also want to check; it uses the AD8603 which is the single option of the AD8609. Please see the link below:
CN0326 Circuit Note | Analog Devices
Thanks,
Kris
Hi Hasan,
I cannot provide an exact value, but it should have an input impedance in the Gohm range. I will check whether this has been measured before.
We have a good reference circuit that you might also want to check; it uses the AD8603 which is the single option of the AD8609. Please see the link below:
CN0326 Circuit Note | Analog Devices
Thanks,
Kris