SM320F28335-EP: Analogue signal isolation

Hello Abhay,

What is the minimum and maximum frequencies? It seems the only remaining solutions are transformer or capacitive coupling. Transformer is better for common mode noise rejection.  

Hello Abhay, 

Could you provide more details about which power supplies the design has available, which voltage and frequency range (as Ron has asked) would be expected from the analog signal. A starting point is this Bridge Sensor Solution (Rev. A), an instrumentation amplifier is not necessary if there is no gain needed in the application. 

All the best,
Carolina 

Hello Ron,

Maximum frequency is 10Khz.

Hello Caro,

I could not relate the Bridge Sensor Solution .

Hey Abhay, 

Okay. Could you please provide a bit more data: 

1. What is the expected voltage range of the analog signal? Understood that the max frequency will be 10kHz. 
2. What is the supply voltages available in the system? 
3. Are there additional system requirements? Cost? Size? 

All the best,
Carolina

1. Expected range is -10 to +10 V.

2.+/-15V.

3.Cost and size are not a constraint for this project.

Abhay,

I did not get an answer for minimum frequency, but I assume it includes DC based on recent answer #1. Do the input signals share a common ground or care if you connect then to your common ground? should the input signal be treated as balanced? How much input impedance is required as not to load the inputs signal excessively? Last questions are about accuracy and signal gain needed.

All of the above factors must be considered in a design. 

Hello Ron,

1.Min frequency is DC.

2.No input signal should have isoalted.

3.No input signal is not balanced.

4.Accuracy : 1%, Gain : Not required. But level shfting and scaling is needed to tie the signal out to ADC.