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AD6655 Datasheet(PDF) 59 Page - Analog Devices |
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AD6655 Datasheet(HTML) 59 Page - Analog Devices |
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59 / 85 page  AD6655 Data Sheet Rev. B | Page 58 of 84 Bit 0—NCO32 Enable When Bit 0 is set, this bit enables the 32-bit NCO operating at the frequency programmed into the NCO frequency register. When Bit 0 is cleared, the NCO is bypassed and shuts down for power savings. NCO Frequency (Register 0x11E to Register 0x121) Register 0x11E, Bits[7:0]—NCO Frequency Value[7:0] Register 0x11F, Bits[7:0]—NCO Frequency Value[15:8] Register 0x120, Bits[7:0]—NCO Frequency Value[23:16] 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: CLK CLK f f f Mod NCO_FREQ ) , ( 232 × = 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 AD6655 ADC clock rate in hertz (Hz). NCO Phase Offset (Register 0x122 and Register 0x123) Register 0x122, Bits[7:0]—NCO Phase Value[7:0] Register 0x123, Bits[7:0]—NCO Phase Value[15:8] 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. Use the following equation to calculate the NCO phase offset value: NCO_PHASE = 216 × PHASE/360 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. |
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