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AN3275 Folha de dados(PDF) 23 Page - STMicroelectronics

Nome de Peças AN3275
Descrição Electrónicos  Improving the performance of smartcard interfaces
PDF  32 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
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AN3275 Folha de dados(HTML) 23 Page - STMicroelectronics

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AN3275
ST8024L application hardware guidelines
Doc ID 17962 Rev 1
23/32
4.2
Clock section optimization
Recommendations for the PCB design clock area include:
●
The XTAL should be connected as closely as possible to the XTAL pins to reduce signal
reflections, especially for high frequency applications (see Figure 19).
●
Two compensation capacitors (C9 and C10), each 15 pF (typ) can improve the
oscillator startup performance. Even without these additional capacitors the CLK duty
cycle is guaranteed between 45% and 55% (according to the NDS specifications), with
frequencies up to 26 MHz.
Figure 19.
ST8024L application PCB crystal (XTAL) connection



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