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参数资料
| 型号： | ICS840001BGT |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 226.66 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| 封装： | 4.40 X 3 MM, 0.925 MM HEIGHT, MO-153, TSSOP-8 |
| 文件页数： | 11/12页 |
| 文件大小： | 194K |
| 代理商： | ICS840001BGT |
840001BG
www.icst.com/products/hiperclocks.html
REV. A MAY 10, 2004
8
Integrated
Circuit
Systems, Inc.
ICS840001
FEMTOCLOCKSCRYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
LAYOUT GUIDELINE
Figure 3A shows a schematic example of the ICS840001. An
example of LVCMOS termination is shown in this schematic.
Additional LVCMOS termination approaches are shown in the
LVCMOS Termination Application Note. In this example, an 18
pF parallel resonant 26.5625MHz crystal is used. The C1=27pF
and C2=33pF are recommended for frequency accuracy. For
FIGURE 3A. ICS840001 SCHEMATIC EXAMPLE
different board layout, the C1 and C2 may be slightly adjusted
for optimizing frequency accuracy. The output frequency can be
set at either 106.25MHz or 212.5MHz. Leaving the R1 un-in-
stalled (or install 1 K
pull-down) will set the output frequency
at 106.25MHz. Installing the R1 pull up will set the output fre-
quency at 212.5MHz.
PC BOARD LAYOUT EXAMPLE
Figure 3B shows an example of P.C. board layout. The crystal
X1 footprint in this example allows either surface mount (HC49S)
or through hole (HC49) package. C3 is 0805. C1 and C2 are
0402. Other resistors and capacitors are 0603. This layout as-
sumes that the board has clean analog power and ground planes.
FIGURE 3B. ICS840001 PC BOARD LAYOUT EXAMPLE
R2
10
C3
10uF
LVCMOS
C4
0.1u
VDDA
Q
R1
1K
Zo = 50 Ohm
C1
27pF
R3
43
C2
33pF
VDD
X1
OE
VDD
U1
ICS840001
1
2
3
4
8
7
6
5
VDDA
OE
XTAL_OUT
XTAL_IN
VDD
Q0
GND
FREQ_SEL
FRE_SEL
VDD=3.3V
C5
0.1u
相关PDF资料 |
PDF描述 |
|---|---|
| ICS840002AGIT | 226.67 MHz, OTHER CLOCK GENERATOR, PDSO16 |
| ICS840002AGI | 226.67 MHz, OTHER CLOCK GENERATOR, PDSO16 |
| ICS840002AGI | 226.67 MHz, OTHER CLOCK GENERATOR, PDSO16 |
| ICS840002AGLF | 226.67 MHz, OTHER CLOCK GENERATOR, PDSO16 |
| ICS840004AG-01T | 175 MHz, OTHER CLOCK GENERATOR, PDSO20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS840001CK-32 | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER |
| ICS840001CK-32LF | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER |
| ICS840001CK-32LFT | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER |
| ICS840001CK-32T | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER |
| ICS840001I | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER |
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