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參數(shù)資料
| 型號(hào)： | ICS8430AY-51LF |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時(shí)鐘產(chǎn)生/分配 |
| 英文描述： | 600 MHz, OTHER CLOCK GENERATOR, PQFP32 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, MS-026, LQFP-32 |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 179K |
| 代理商： | ICS8430AY-51LF |
8430AY-51
www.icst.com/products/hiperclocks.html
REV. D FEBRUARY 11, 2003
9
PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS8430-51
600MHZ, LOW JITTER
LVCMOS/ LVTTL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
The ICS8430-51 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 24.
Figure 4A shows how to interface with a crystal.
Figures 4A, 4B, and 4C show various crystal parameters
which are recommended only as guidelines.
Figure 4A shows
how to interface a capacitor with a parallel resonant crystal.
Figure 3B shows the capacitor value needed for the optimum
FIGURE 4B. Recommended tuning capacitance for various parallel
resonant crystals.
FIGURE 4C. Recommended tuning capacitance for various
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
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS8430-51 provides
separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
CC, VCCA, and VCCO
should be individually connected to the power supply
plane through vias, and bypass capacitors should be
used for each pin. To achieve optimum jitter performance,
power supply isolation is required.
Figure 3 illustrates how
a 10
resistor along with a 10F and a .01F bypass
capacitor should be connected to each V
CCA pin.
POWER SUPPLY FILTERING TECHNIQUES
FIGURE 3. POWER SUPPLY FILTERING
10
V
CCA
10
F
.01
F
3.3V
.01
F
V
CC
FIGURE 4A. CRYSTAL INTERFACE
Optional
XTAL2
(Pin 25, LQFP)
XTAL1
(Pin 24, LQFP)
ICS8430-51
ppm performance over various parallel resonant crystals.
Figure 4C shows the recommended tuning capacitance for
various parallel resonant crystals.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICS8430AY-51T | 制造商:ICS 制造商全稱:ICS 功能描述:600MHZ, LOW JITTER LVCMOS/ LVTTL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS8430AY-61 | 制造商:Integrated Device Technology Inc 功能描述: |
| ICS8430AY-61LF | 功能描述:IC SYNTHESIZR DUAL LVPECL 32LQFP 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™ 標(biāo)準(zhǔn)包裝:2,000 系列:- 類型:PLL 頻率合成器 PLL:是 輸入:晶體 輸出:時(shí)鐘 電路數(shù):1 比率 - 輸入:輸出:1:1 差分 - 輸入:輸出:無/無 頻率 - 最大:1GHz 除法器/乘法器:是/無 電源電壓:4.5 V ~ 5.5 V 工作溫度:-20°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-LSSOP（0.175"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-SSOP 包裝:帶卷 (TR) 其它名稱:NJW1504V-TE1-NDNJW1504V-TE1TR |
| ICS8430AY-61LFT | 功能描述:IC SYNTHESIZER LVPECL 32-LQFP 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™ 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:時(shí)鐘/頻率合成器，扇出分配 PLL:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 除法器/乘法器:- 電源電壓:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:56-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-VFQFP-EP（8x8） 包裝:帶卷 (TR) 其它名稱:844S012AKI-01LFT |
| ICS8430AY-62LF | 功能描述:IC SYNTHESIZER LVPECL 32-LQFP 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™ 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:時(shí)鐘/頻率合成器，扇出分配 PLL:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 除法器/乘法器:- 電源電壓:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:56-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-VFQFP-EP（8x8） 包裝:帶卷 (TR) 其它名稱:844S012AKI-01LFT |
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