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AWR2944EVM: ADC位数

Part Number: AWR2944EVM

你好,我想问一下2944的adc是多少位的,是16位还是12,14位呢,现在我可以把正数的adc数据放入adcbuf中,并启用HWA做fft,可以得到正确fft,但是我把负数的adc数据放入adcbuf中,启用HWA做fft,却得不到正确的fft,我认为2944的adc是12位,所以adc数值范围为-4096~4096吗?