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about C5515 internal ADC

Jerry Zhou43488
Prodigy 80 points
Other Parts Discussed in Thread: TMS320C5515

I need to connect a 3 axis accelerometer(analog output) with the C5515（TMS320C5515 Evaluation Module from Spectrum digital)

The datasheet shows the internal SAR ADC is used for battery and power calculation and touch sceen not recommended for mainsteam analogue signal. And the Vref can be up to only 1.3V.

So which is the best solution

1  An ADC chip(spi interface) into my design

2  An amplifier to scale the input signal down to less than 1.3V

Thanks

  • 0
    TI__Expert 8065 points

    Jerry,

    It is not an easy question.

    If the sensor's output signal is over 1.3V, then you will loose information by scaling it down to 1.3V.  If you are OK with it, then you can use SAR.

    If you want to keep the original information without loosing any data and also OK with additional cost for an external ADC, then an external ADC would be better.

    Also, please consider the sampling speed. The SAR in the C5515 takes 32 CPU cycles to convert one sample.

    Best Regards,

    Peter Chung