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TMS320C5505: Maximum frequency of input signal

Part Number: TMS320C5505

Dear All,

Does anyone have idea about what is the maximum frequency of the input signal which can be applied to TMS320c5505 EVM.

I wrote a simple code in which output  = input.

However, when frequency of input signal goes above ~25 KHz, output starts attenuating.

When input signal frequency is ~28 KHz, output is 0.

Does that mean we cannot apply high frequency input signal to TMS320c5505 EVM? Or there might be something not correct about my code.

Please suggest.

Thanks and regards,
Satyajit

  • Hi,

    See section 1.4.2.4.2 Clock Generator After Reset from TMS320C5505 DSP System User's Guide (www.ti.com/.../sprugh5b.pdf):
    "After reset, the on-chip bootloader programs the system clock generator based on the input clock selected via the CLK_SEL pin. If CLK_SEL = 0, the bootloader programs the system clock generator and sets the system clock to 12.288 MHz (multiply the 32.768-kHz RTC oscillator clock by 375). If CLK_SEL = 1, the bootloader bypasses the system clock generator altogether and the system clock is driven by the CLKIN pin. In this case, the CLKIN frequency is expected to be 11.2896 MHz, 12.0 MHz, or 12.288 MHz. While the bootloader tries to boot from the USB , the clock generator is programmed to output approximately 36 MHz."

    Best Regards,
    Yordan