This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AMC1203: AMC1210

Part Number: AMC1203
Other Parts Discussed in Thread: AMC1210, , ADS1203

Hi,

In one project, I need to transfer Analog signal from High voltage(Hot) side to Low voltage (Cold) side with at least 10kV isolation and at least 20kHz bandwidth(-3dB).  I would like convert  analog signal into digital signal first. The digital signal will be transferred to cold side with high isolation pulse transformer and  then convert back to analog signal. The analog will be converter to current signal and transferred to remote location.

In this regard, I would like to use 1-bit stream AMC1203 or equivalent delta sigma modulators and AMC1210 or equivalent  decimation filter to convert back to analog signal. Please let me know how AMC1203 can be interfaced with primary of pulse transformer and how secondary of pulse transformer interfaced with AMC1210.  Thanks in advance.

Thanks and Regards,

Rajareddy

  • Hi Raja,

    There is an app note describing a similar situation here.  You would have to feed both the data and clock from the AMC1203 to the AMC1210.  Sounds like an interesting application, do let us know how you manage!

  • Hi Hendrick,

    I use ADS1203  and operate in Mode 2(refer figure 15 in datasheet) on hot side. In this mode, clock signal is not required. This digital signal will be transferred to cold side with high voltage isolation transformer. I use digital filter for 2nd order Delta sigma modulator(like AMC1210 or equivalent). My budget does not support even AMC1210 because micro controller is also required to interface with AMC1210. Please suggest any part for Digital filtering of ADS1203 output. After converting digital signal into analog signal, this analog signal will be transferred to the remote location using voltage to current converter. Please suggest parts for  digital filtering of transformer  secondary side signal.

    Thanks and Regards,

    Raja Reddy B

  • Hi Raja,

    Initially you said you were using the AMC1203 - the ADS1203 Mode 2 is Manchester Encoded data.  You would need to use a Manchester decoder to reconstruct the bit stream before applying any sort of digital filter.   There are no stand alone parts in our portfolio other than the AMC1210 that can do this besides one of the Delphino class C2000 controllers or perhaps an MSP430.  Can you use an isolated amplifier and keep everything in the analog domain?  That will make it harder to reach your 10kV isolation, but you wouldn't have to deal with the bit-stream.

  • Dear Hendrick,

    Thanks for reply.

    We would use  ADS1203 not AMC1203. I typed mistakenly AMC1203 instead of ADS1203. Isolation between cold and hot side will be done

    through pulse transformer like you have given Application Note. Please suggest some low cost solution to convert pulse transformer output(digital) to analog signal.

    Thanks in advance.

    Thanks and Regards,

    Raja Reddy

  • Hi Raja,

    The lowest cost solution would be to use a simple low pass filter, take a look at this application note:

    http://www.ti.com/lit/an/spraa88a/spraa88a.pdf

  • Hi Tom,

    Thanks for reply. I have read datasheet of ADS1203. I would like to operate this in mode2(Manchester encoder mode) and Dataout is connected to pulse transformer for galvanic isolation and avoid transformer saturation(in Manchester mode positive volt sec same as negative volt sec).  I initially thought of using AMC1210 as Manchester decoder but it understood that when operated this device in Mode2, it cannot use SPI(16 bit data). It will give data in the form of 8 parallel bits. It will reduce my resolution and increases inaccuracy. Please let me know can we use SFDM module in the micro contry  for Manchester decoding and Sinc filters.

    Thanks in advance.

    Thanks and Regards,

    Raja Reddy

  • Hi Raja,

    I believe you meant to write "can we use SFDM module in the microcontroller for Manchester decoding and Sinc filters", if that is the case, please let me know what controller you plan to use.

  • Hi Tom,

    Thanks for reply. Yes, you are correct. I want to use TMS320F280049RSH microcontroller. Please let me know can this be used for Manchester decoding and Sinc filters implementation using SFDM module?

    Regards,

    Raja Reddy

  • Hi Raja,

    The TMS320F280049RSH SDFM module does support Manchester decoding.  

  • Dear Tom,

    Thanks for reply.

    Please suggest a microcontroller which can

    support  Manchester decoding. Please also let me know, does AMC1210 supports Manchester decoding with 16 bit resolution?

    Thanks and Regards,

    Raju Baddipadige