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NRF24AP2-USBQ32-R7 데이터시트(PDF) 30 Page - List of Unclassifed Manufacturers

부품명 NRF24AP2-USBQ32-R7
상세설명  Single-chip ANT ultra-low power wireless network solution
PDF  44 Pages
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제조업체  ETC1 [List of Unclassifed Manufacturers]
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NRF24AP2-USBQ32-R7 데이터시트(HTML) 30 Page - List of Unclassifed Manufacturers

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Revision 1.0
Page 30 of 44
nRF24AP2-USB Product Specification
6
On-chip oscillator
In order to provide the necessary clocks for the ANT protocol stack, nRF24AP2 contains one high
frequency oscillator used by the RF transceiver. The high frequency clock source must be a 16 MHz crystal
oscillator.
6.1
Features
•
Low-power, amplitude regulated 16 MHz crystal oscillator
6.2
Block diagram
Figure 23. Block diagram of 16 MHz crystal oscillator
6.3
Functional description
6.3.1
16 MHz crystal oscillator
The 16 MHz crystal oscillator is designed to be used with an AT-cut quartz crystal in parallel resonant
mode. To achieve correct oscillation frequency it is very important that the load capacitance matches the
specification in the crystal datasheet. The load capacitance is the total capacitance from the perspective of
the crystal across its terminals:
Amplitude
regulator
XC1
XC2
C1
C2
Crystal
PIN
PCB
PIN
PCB
LOAD
C
C
C
C
C
C
C
C
C
C
C
C
C
+
+
=
+
+
=
+
⋅
=
2
2
'
2
1
1
'
1
'
2
'
1
'
2
'
1



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