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AMC1336: buffer

daniel malka
Prodigy 50 points
Part Number: AMC1336
Other Parts Discussed in Thread: ISO224,

question regarding AMC1336.

i want to use it to sample wide input and i am sure that i will have a noise in the input. - can i work with a buffer before the positive input?

and also can you let me know what will be the error according to the noise? it is possible to get 1 Volt error because of the noise?  

  • 0
    TI__Guru 55152 points

    Hi Daniel,

    For very noisy environments, a device with a wider input range is preferable. The ISO224 has a +/-12V input range and may be worth looking into for this application. 

    I would not recommend placing a buffer only on the positive input, as it will degrade the common-mode rejection ratio of the input amplifier. However, if you want to buffer the inputs differentially, that would help reduce the noise and increase SNR. 

    This depends on the magnitude of the noise and the full-scale range of the measurement. Since AMC1336 is a modulator and outputs a digtial bit-stream the performance of the signal chain is ultimately dependent on the digital filter.