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Analog Input of AD7940.

Question asked by MohitH on May 14, 2013
Latest reply on May 19, 2013 by MohitH

Hi everyone,

 

I have a query regarding the analog input interface of AD7940.

 

I want to interface of RMS to DC Converter, AD8362 to input of AD7940. Now Input circuit

of AD7940 shows a 25 ohm resistor to charge a 25pF capacitor. In that case, the current

required to charge the capacitor can go upto 100mA or so.

 

Is it possible to connect the output of AD8362

 

1) Directly to AD7940.

          OR

2) Through some resistance as 100/220 ohm (as for AD8362, RL >= 200 ohm is recommended).

          OR

3) Or some High Current Buffer has to be placed here.

 

Please suggest. Many Regards

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