Electronic Components Datasheet Search |
|
ICS843002I Datasheet(PDF) 11 Page - Integrated Circuit Systems |
|
ICS843002I Datasheet(HTML) 11 Page - Integrated Circuit Systems |
11 / 16 page 843002AGI www.icst.com/products/hiperclocks.html REV. A JANUARY 4, 2006 11 Integrated Circuit Systems, Inc. ICS843002I FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER LAYOUT GUIDELINE Figure 5A shows a schematic example of the ICS843002I. An example of LVEPCL termination is shown in this schematic. Additional LVPECL termination approaches are shown in the LVPECL Termination Application Note. In this example, an FIGURE 5A. ICS843002I SCHEMATIC EXAMPLE 18pF parallel resonant 26.5625MHz crystal is used. The C1=27pF and C2=33pF are recommended for frequency ac- curacy. For different board layout, the C1 and C2 may be slightly adjusted for optimizing frequency accuracy. FIGURE 5B. ICS843002I PC BOARD LAYOUT EXAMPLE PC BOARD LAYOUT EXAMPLE Figure 5B shows an example of ICS843002I P.C. board layout. The crystal X1 footprint shown in this example allows installa- tion of either surface mount HC49S or through-hole HC49 pack- age.The footprints of other components in this example are listed in the Table 6. There should be at least one decoupling capacitor per power pin. The decoupling capacitors should be located as close as possible to the power pins. The layout assumes that the board has clean analog power ground plane. TABLE 6. FOOTPRINT TABLE e c n e r e f e Re z i S 2 C , 1 C2 0 4 0 3 C5 0 8 0 8 C , 7 C , 6 C , 5 C , 4 C3 0 6 0 2 R3 0 6 0 s e z i s t n e n o p m o c s t s il , 6 e l b a T : E T O N . e l p m a x e t u o y a l s i h t n i n w o h s ICS843002I C7 0.1u C1 27pF Zo = 50 Ohm C4 0.01u C9 0.1u To Logic Input pins VCC U1 ICS843002i R9 50 Logic Control Input Examples VCC Set Logic Input to '0' R3 133 Set Logic Input to '1' R8 50 Zo = 50 Ohm RU2 Not Install Zo = 50 Ohm R2 10 C6 0.1u R4 82.5 R7 50 R5 133 C3 10uF VCCO=3.3V + - Optional Termination RD1 Not Install VCC VCCO VCC=3.3V + - VCCA 3.3V RD2 1K To Logic Input pins VCCO C2 33pF C8 0.1u RU1 1K Zo = 50 Ohm VCC 18pF X1 26.5625MHz R6 82.5 |
Similar Part No. - ICS843002I |
|
Similar Description - ICS843002I |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |