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ADF7030-1 数据表(PDF) 6 Page - Analog Devices

部件名 ADF7030-1
功能描述  Hardware Reference Manual
Download  15 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADF7030-1 数据表(HTML) 6 Page - Analog Devices

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UG-957
ADF7030-1 Hardware Reference Manual
Rev. 0 | Page 6 of 15
32.768 kHz Wake-Up Crystal (Optional)
If a greater wake-up accuracy is needed than the accuracy
provided by the internal 26 kHz oscillator, the user can connect
an external 32.768 kHz crystal oscillator between the GPIO6
and GPIO7 pins.
The crystal oscillator must be operated in parallel mode; two
parallel loading capacitors are required for oscillation at the
correct frequency. The values of the capacitors are dependent
upon the crystal specification. The capacitors must be chosen to
ensure the shunt value of capacitance added to the PCB track
capacitance and the input pin capacitance of the ADF7030-1
equals the specified load capacitance of the crystal. Track
capacitance values typically vary from 2 pF to 5 pF, depending on
board layout. Ensure the lengths of the PCB traces from the crystal
to the pins are as close to equal as possible.
The total load capacitance can be calculated using the following
equation:
PCB
PIN
LOAD
C
C
C2
C1
C
+
+
+
=
2
1
1
1
(2)
where:
CLOAD is the total load capacitance.
C1 and C2 are the external crystal load capacitors.
CPIN is the ADF7030-1 input capacitance of the GPIO6 and
GPIO7 pins (refer to the ADF7030-1 data sheet).
CPCB is the PCB track capacitance.
To ensure stable frequency operation over all conditions, choose
capacitors that have a very low temperature coefficient.


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