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AD6654/PCB 数据表(PDF) 59 Page - Analog Devices |
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AD6654/PCB 数据表(HTML) 59 Page - Analog Devices |
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59 / 88 page  AD6654 Rev. 0 | Page 59 of 88 count reaches 1, the new frequency and/or phase offset is loaded into the NCO. Note: When using SPI or SPORT for programming these registers, the last step in the above procedure needs to be repeated, that is, the soft synchronization register needs to be written twice. Hop with Pin Sync Four sync pins (SYNC0, SYNC1, SYNC2, and SYNC3) provide very accurate synchronization among channels. Each channel can be programmed to look at any of the four sync pins. To control the hop of channel NCO frequencies: 1. Write the NCO frequency register(s) or phase offset register(s) to the new value. 2. Write the NCO frequency hold-off counter(s) to the appropriate value (greater than 0 and less than 216). 3. Program the channel NCO control registers to monitor the appropriate SYNC pins. 4. Write the hop synchronization enable bit and SYNC pin enable bits high in the pin synchronization configuration register. This enables the countdown of the frequency hold-off counter. When the count reaches 1, the new frequency and/or phase offset is loaded into the NCO. |
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