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AD6653 Datasheet(PDF) 52 Page - Analog Devices |
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AD6653 Datasheet(HTML) 52 Page - Analog Devices |
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52 / 80 page  AD6653 Rev. 0 | Page 52 of 80 NCO Frequency (Register 0x11E to Register 0x121) NCO Phase Offset (Register 0x122 and Register 0x123) Register 0x11E, Bits[7:0]—NCO Frequency Value[7:0] Register 0x122, Bits[7:0]—NCO Phase Value[7:0] Register 0x11F, Bits [7:0]—NCO Frequency Value[15:8] Register 0x123, Bits[7:0]—NCO Phase Value[15:8] Register 0x120, Bits[7:0]—NCO Frequency Value[23:16] The 16-bit value programmed into the NCO phase value register is loaded into the NCO block each time the NCO is started or when an NCO SYNC signal is received. This process allows the NCO to be started with a known nonzero phase. Register 0x121, Bits[7:0]—NCO Frequency Value[31:24] This 32-bit value is used to program the NCO tuning frequency. The frequency value to be programmed is given by the following equation: Use the following equation to calculate the NCO phase offset value: NCO_PHASE = 216 × PHASE/360 CLK CLK f f f Mod NCO_FREQ ) , ( 2 32 × = where: NCO_PHASE is a decimal number equal to the 16-bit binary number to be programmed at Register 0x122 and Register 0x123. PHASE is the desired NCO phase in degrees. where: NCO_FREQ is a 32-bit twos complement number representing the NCO frequency register. f is the desired carrier frequency in hertz (Hz). fCLK is the AD6653 ADC clock rate in hertz (Hz). |
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