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AD6654/PCB 데이터시트(PDF) 59 Page - Analog Devices

부품명 AD6654/PCB
상세설명  14-Bit, 92.16 MSPS, 4-/6-Channel Wideband IF to Baseband Receiver
PDF  88 Pages
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
Logo AD - Analog Devices

AD6654/PCB 데이터시트(HTML) 59 Page - Analog Devices

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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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