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IWR1642: How to make sampling rate lower than 2000 kilosamples per second

Part Number: IWR1642

Hi everyone!

My customer made custom board based on IWR1642 78ZDFZ9 502 ABL G1. I am developing software for it.

This device should produce one long chirp (5 ms) and read 1024 samples for this chirp.
The problem is that minimum sampling frequency (according to SDK) is 2000 kilosamples per second:

rlUInt16_t numAdcSamples;
/**
 * @brief  ADC Sampling rate for each profile is encoded in \n
               2 bytes (16 bit unsigned number)\n
               1 LSB = 1 ksps \n
               Valid range 2000 to 37500 \n
 */

How can I make sampling rate lower?