Gain setting in AD8216

Hi Nidhi P Shetty,

I think it's possible. But you should understand that this is only possible by adding external resistors, which are highly likely to spoil the good performance of this amplifier.

First, the value of the external resistors can be calculated using some assumptions. From the datasheet, we can conclude that the resistance of one branch of the input attenuator is 100 kilohms. From the expression for total gain, we learn that for a unity gain, the transfer coefficient of the input attenuator should decrease by 3 times and be 1/54. According to my calculations, adding two resistors of 200 kilohms in series with the inputs should satisfy this.

Second, since you have samples, you can make a layout and use an external potentiometer added in series with the input to find out the experimentally necessary value of additional external resistors.

Third, you can expect someone here to tell you the value of these resistors or suggest an alternative.

Regards,

Kirill

Hi Nidhi P Shetty,

I think it's possible. But you should understand that this is only possible by adding external resistors, which are highly likely to spoil the good performance of this amplifier.

First, the value of the external resistors can be calculated using some assumptions. From the datasheet, we can conclude that the resistance of one branch of the input attenuator is 100 kilohms. From the expression for total gain, we learn that for a unity gain, the transfer coefficient of the input attenuator should decrease by 3 times and be 1/54. According to my calculations, adding two resistors of 200 kilohms in series with the inputs should satisfy this.

Second, since you have samples, you can make a layout and use an external potentiometer added in series with the input to find out the experimentally necessary value of additional external resistors.

Third, you can expect someone here to tell you the value of these resistors or suggest an alternative.

Regards,

Kirill