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參數(shù)資料
| 型號： | IDT5V9888PFGI8 |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 500 MHz, OTHER CLOCK GENERATOR, PQFP32 |
| 封裝： | GREEN, TQFP-32 |
| 文件頁數(shù)： | 3/37頁 |
| 文件大?。?/td> | 354K |
| 代理商： | IDT5V9888PFGI8 |
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11
INDUSTRIALTEMPERATURERANGE
IDT5V9888
3.3V EEPROMPROGRAMMABLECLOCKGENERATOR
The spread spectrum parameters such as the modulation frequency and profile will not be enabled nor will it have any impact on the PLL output when the
PLLisprogrammedforfractionaldivide.
The following is an example of how to set the fractional divider.
Example
FIN = 20MHz, FOUT1 = 168.75MHz, FOUT2 = 350MHz
Solving for 350MHz using Eq.2 and Eq.3 with PLL0 and spread spectrum off,
350MHz = 20MHz * (M / D)
P * 2
For better jitter performance, keep D as small as possible
350MHz * 2 = M = 35
20MHz
P
1
Therefore, we have D = 1, M = 35 (N = 16, A = 2) for PLL0 with P = 1 on output bank4 resulting in 350MHz.
Solving for 168.75MHz with PLL1 and fractional divide enabled:
168.75MHz = 20MHz * (M / D)
P * 2
168.75MHz * 2 = M = 16.875 or 33.75
20MHz
P
1
2
The 33.75 value is chosen to achieve the highest VCO frequency possible. Next step is to figure out the setting for the fractional divide using Eq.3.
33.75 = 2*N + A + 1 + SS_OFFSET * 1/64
Integer value 33 can be determined by N and A, thus leaving 0.75 left to be solved.
2*N + A + 1 = 33
SS_OFFSET = 64 * 0.75 = 48
Therefore, we have D=1, M=33.75 (N=15, A=2, SS_OFFSET=48) for PLL1 with P=2 on an output bank resulting in 168.75MHz.
Thefractionaldividercanbedeterminedifitisneededbyfollowingthestepsinthepreviousexample. Notethatthe5V9888 shouldnotbeprogrammedwith
TSSC > '0', SS_OFFSET = '0', and SD = '0' in order to prevent an unstable state in the modulator. The A[3:0] must be used and set to be greater than '2' for
amoreaccuratefractionaldivide.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IDT5V9888TNLGI | 制造商:Integrated Device Technology Inc 功能描述:IC CLOCK GEN PLL 500MHZ 28-VFQFP |
| IDT5V9888TNLGI8 | 制造商:Integrated Device Technology Inc 功能描述:IC CLOCK GEN PLL 500MHZ 28VFQFPN |
| IDT5V9888TPFGI | 制造商:Integrated Device Technology Inc 功能描述:IC CLOCK GEN PLL 500MHZ 32TQFP |
| IDT5V9888TPFGI8 | 制造商:Integrated Device Technology Inc 功能描述:IC CLOCK GEN PLL 500MHZ 32TQFP |
| IDT5V9910A-2SOG | 功能描述:IC BUFFER ZD PLL SGL I/O 24-SOIC RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:TurboClock™ JR 標準包裝:1,000 系列:- 類型:時鐘/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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