Os motores de busca de Datasheet de Componentes eletrônicos |
|
SI52146-A01AGMR Folha de dados(PDF) 7 Page - Silicon Laboratories |
|
SI52146-A01AGMR Folha de dados(HTML) 7 Page - Silicon Laboratories |
7 / 20 page Si52146 Preliminary Rev. 0.1 7 2. Functional Description 2.1. Crystal Recommendations The clock device requires a parallel resonance crystal. Substituting a series resonance crystal causes the clock device to operate at the wrong frequency and violates the ppm specification. For most applications there is a 300 ppm frequency shift between series and parallel crystals due to incorrect loading. 2.1.1. Crystal Loading Crystal loading plays a critical role in achieving low ppm performance. To realize low ppm performance, use the total capacitance the crystal sees to calculate the appropriate capacitive loading (CL). Figure 1 shows a typical crystal configuration using the two trim capacitors. It is important that the trim capacitors are in series with the crystal. It is not true that load capacitors are in parallel with the crystal and are approximately equal to the load capacitance of the crystal. Figure 1. Crystal Capacitive Clarification 2.1.2. Calculating Load Capacitors In addition to the standard external trim capacitors, consider the trace capacitance and pin capacitance to calculate the crystal loading correctly. Again, the capacitance on each side is in series with the crystal. The total capacitance on both side is twice the specified crystal load capacitance (CL). Trim capacitors are calculated to provide equal capacitive loading on both sides. Figure 2. Crystal Loading Example Table 4. Crystal Recommendations Frequency (Fund) Cut Loading Load Cap Shunt Cap (max) Motional (max) Tolerance (max) Stability (max) Aging (max) 25 MHz AT Parallel 12–15 pF 5 pF 0.016 pF 35 ppm 30 ppm 5 ppm |
Nº de peça semelhante - SI52146-A01AGMR |
|
Descrição semelhante - SI52146-A01AGMR |
|
|
Ligação URL |
Privacy Policy |
ALLDATASHEETPT.COM |
ALLDATASHEET é útil para você? [ DONATE ] |
Sobre Alldatasheet | Publicidade | Contato conosco | Privacy Policy | roca de Link | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |