AMC1333M10: An Isolated ADC - (To sense 0 to 10V input voltage)

Mastik Kumar

Part Number: AMC1333M10
Other Parts Discussed in Thread: AMC1210, ADC161S626, OPA2388-Q1

Hello,

Could you please confirm if the isolated ADC AMC1333M10 is suitable for processing a 10V analog signal with a frequency range of 1-5 Hz? If not, kindly recommend an alternative isolated ADC that would be more appropriate for this application.

Additionally, I would appreciate your guidance on selecting a suitable OpAmp for the aforementioned setup.

Please consider the following property of ADC and DAC as follows:

An Isolated ADC - (To sense 0 to 10V input voltage)

Sampling rate - 200ksps or 250ksps

Resolution - 12 bits

Isolation can be in ADC or ADC front OpAmp

Channels - preferable 4 Independent

Simultaneous sampling not required

Kindly suggest if "AMC1210 Q1" part is suitable for this.

An Isolated DAC - (To Drive 0 to 10V input voltage)

Sampling rate - 200ksps or 250ksps

Resolution - 12 bits

Drive current - up to 250mA to 300mA

Channels - preferable 4 Independent

Isolation can be in DAC or DC Driver OpAmp

Thanks

over 1 year ago

0 Alexander Smith over 1 year ago

TI__Mastermind 49831 points

Hi Mastik,

AMC1333M10 is an isolated modulator, meaning that it outputs a 1's and 0's bit density proportional to the input voltage. This 1's and 0's density could then be fed to a sigma delta filter module like the AMC1210 to convert to samples. However I do not believe the AMC1333M10 will be able to meet your resolution and sample speed requirement.

Table 2 of this document explains in further detail: https://www.ti.com/lit/wp/sbaa359a/sbaa359a.pdf?ts=1690819960923

I recommend considering a SAR ADC + digital isolator architecture to sample the 0-10V voltage. The parametric tables below can assist with product selection:

https://www.ti.com/data-converters/adc-circuit/precision-adcs/products.html

https://www.ti.com/isolation/digital-isolators/products.html

https://www.ti.com/data-converters/dac-circuit/precision/products.html

0 Mastik Kumar over 1 year ago in reply to Alexander Smith

Prodigy 130 points

Hello Alex,

I wanted to inform you that I've chosen an operational amplifier (opamp) that can convert a 10V analog signal to a lower voltage, which will be fed into an isolated differential amplifier. The resulting differential signal will then be directed to an ADC. I'm planning to investigate the ADC161S626 further.

Could you please confirm whether this architecture is appropriate for processing low-frequency signals? Specifically, I'm interested in signals within the range of (0-5) Hz and (0-10)V analog signal.

OpAmp: OPA2388-Q1, Input given 0-10V Sine wave with 5Hz frequency

Isolated Diff Amp: AMC1100-Q1

ADC : ADC161S626

Please let me know if anything is required for this.

Thanks

+1 Alexander Smith over 1 year ago in reply to Mastik Kumar

TI__Mastermind 49831 points

Hi Mastik,

I don't see an issue with this, but you may want to create another thread on the operational amplifiers forum to confirm.

This cookbook may help: https://www.ti.com/lit/an/sbaa568/sbaa568.pdf

0 Mastik Kumar over 1 year ago in reply to Alexander Smith

Prodigy 130 points

Hi Alex,

Thanks

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AMC1333M10: An Isolated ADC - (To sense 0 to 10V input voltage)