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Original question:

AMC1305M25: Evaluating AMC1305 with C2000

AMC1305M25: Modulator Data Output and Modulator Clock Relationship

Dylan Zheng
Intellectual 1425 points
Part Number: AMC1305M25

Hi Team,

For each input voltage, Does the modulator have fixed-bit data output and fixed-numbers of clock? Or it  just uses density of ones in the output bitstream to express input voltage value, no data format and clock format restrictions.

For example:

1.5V input -> 8 bit stream modulator data output->8 clock cycle

3.3V input -> 8 bit stream modulator data output->8 clock cycle

Best regards,

Dylan

  • 0
    TI__Mastermind 31655 points

    Hi Dylan,

    The modulator output is a single-bit bitstream, with the density of the ones corresponding to the input voltage of the modulator. There is no serial data format, and the only clock restrictions are the frequency (5-20.1Mhz) and duty cycle (40 - 60%). 

    The bitstream output will need to be filtered to produce a digital word that corresponds to the AMC1305's input. Since the clock rate is high, a specialized filter module is usually used for processing the bitstream. A micocontroller like the C2000 (https://www.ti.com/product/TMS320F28377D) with a sigma-delta filter module (SDFM) is a good option for interfacing with the modulator output.

    Regards,