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參數(shù)資料
| 型號(hào)： | ICS8431CM-11T |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時(shí)鐘產(chǎn)生/分配 |
| 英文描述： | 255 MHz, OTHER CLOCK GENERATOR, PDSO28 |
| 封裝： | 7.50 X 18.05, 2.25 MM HEIGHT, SOIC-28 |
| 文件頁(yè)數(shù)： | 18/18頁(yè) |
| 文件大?。?/td> | 2136K |
| 代理商： | ICS8431CM-11T |
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8431CM-11
www.icst.com/products/hiperclocks.html
REV. B AUGUST 7, 2002
9
Integrated
Circuit
Systems, Inc.
ICS8431-11
255MHZ, LOW JITTER, CRYSTAL OSCILLATOR-
TO
-3.3V LVPECL FREQUENCY SYNTHESIZER
The ICS8431-11 features an internal oscillator that uses an
external quartz crystal as the source of its reference frequency.
A 16MHz crystal divided by 16 before being sent to the phase
detector provides the reference frequency. The oscillator is a
series resonant, multi-vibrator type design. This design provides
better stability and eliminates the need for large on chip capacitors.
Though a series resonant crystal is preferred, a parallel resonant
crystal can be used. A parallel resonant mode crystal used in a
series resonant circuit will exhibit a frequency of oscillation a few
hundred ppm lower than specified. A few hundred ppm translates
to KHz inaccuracy. In general computing applications this level
of inaccuracy is irrelevant. If better ppm accuracy is required, an
external capacitor can be added to a parallel resonant crystal in
series to pin 25.
Figure 1A shows how to interface with a crystal.
Figures 1A, 1B, and 1C show various crystal parameters which
are recommended only as guidelines.
Figure 1A shows how to
interface a capacitor with an 18pF parallel resonant crystal.
Fig-
ure 1B shows the capacitor value needed for the optimum ppm
performance over various parallel resonant crystals.
Figure 1C
shows the recommended tuning capacitance for a various par-
allel resonant crystal.
FIGURE 1A - CRYSTAL INTERFACE
Optional
XTAL2
(Pin 26, SOIC)
XTAL1
(Pin 25, SOIC)
ICS8431-11
FIGURE 1B. Recommended tuning capacitance for various
18pF parallel resonant crystals.
FIGURE 1C. Recommended tuning capacitance for various
18pF parallel resonant crystals.
14.318
15.000
16.667
24.000
19.440
20.000
0
10
20
30
40
50
60
14
15
16
17
18
19
20
21
22
23
24
25
Crystal Frequency (MHz)
S
e
ri
es
C
apac
itor
,C
1
(
p
F
)
-100
-80
-60
-40
-20
0
20
40
60
80
100
0
1020
30
4050
60
Series Capacitor, C1 (pF)
F
requency
A
ccur
a
cy
(
ppm
)
19.44MHz
16MHz
15.00MHz
CRYSTAL INPUT AND OSCILLATOR INTERFACE
APPLICATION INFORMATION
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| ICS843201AG-375LF | 功能描述:IC SYNTHESIZER 375MHZ 16-TSSOP RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™, FemtoClock™ 標(biāo)準(zhǔn)包裝:27 系列:Precision Edge® 類型:頻率合成器 PLL:是 輸入:PECL，晶體 輸出:PECL 電路數(shù):1 比率 - 輸入:輸出:1:1 差分 - 輸入:輸出:無/是 頻率 - 最大:800MHz 除法器/乘法器:是/無 電源電壓:3.135 V ~ 5.25 V 工作溫度:0°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:管件 |
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