How to determine attenuation divider for Differential input to AD7264?

Hello,

 

For our application, we are using AD7264 as input stage.

The AD7264 will be fed with four analogue differential channels:

  1. 0 Vdc to 100 Vdc - two channels
  2. 0 Vdc to 10 Vdc - two channels

 

Datasheet defines two specific values for Vcm range

2 V for PGA = 1

(AVcc / 2) for 2 <= PGA <= 128

 

1. How to identify the "Vcm" run-time?

2. How to design the incoming differential signal attenuator if no Vcm is specified?

3. If Vcm is specified to be zero, how the ADC would handle -ve signal range as per the equation:

Analogue input range = (Vcm) +- (Vref / (2 x Gain)) and single +5 V supply operation?

 

Best regards,

--Utpal

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    •  Analog Employees 
    on Aug 2, 2018 3:33 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

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    EZ Admin
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  • 0
    •  Analog Employees 
    on Aug 2, 2018 3:33 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin
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