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參數(shù)資料
| 型號： | GS4915 |
| 廠商： | Gennum Corporation |
| 英文描述： | CONN,S/R,8 POS,254C-08-1, CLOSED END STRAIN RELIEF COVER |
| 中文描述： | ClockCleaner⑩ |
| 文件頁數(shù)： | 15/26頁 |
| 文件大?。?/td> | 533K |
| 代理商： | GS4915 |
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GS4915 Data Sheet
39145 - 3
November 2007
15 of 26
3.3.4 External VCO
The GS4915 uses the external GO1555 Voltage Controlled Oscillator as part of its
phase-locked loop. This external VCO implementation was chosen to ensure
superior jitter performance of the device.
Power for the external VCO is generated entirely by the GS4915 from an on-chip
voltage regulator. The internal regulator uses +3.3V DC supplied at the REG_VDD
pin to provide +2.5V at the VCO_VDD pin.
Based on the control voltage output by the GS4915 on the LF pin, the GO1555
produces a 1.485GHz reference signal for the PLL. This signal must be run via a
50
Ω
controlled-impedance trace to the VCO pin of the GS4915. The VCO receiver
block of the device will then convert this single-ended signal into the differential
1.485GHz reference signal used by the clock cleaning PLL.
Both the reference and controls signals should be referenced to the supplied
VCO_GND, as shown in the recommended application circuit of the
Typical
Application Circuit on page 22
.
3.4 Modes of Operation
The GS4915 may operate in one of two possible frequency modes, and in one of
three possible bypass modes. The combination of the frequency mode and bypass
mode will determine the frequency and jitter of the output clock.
3.4.1 Frequency Modes
The frequency mode of the device is determined entirely by the setting of the
external FCTRL[1:0] pins.
In both Auto and Fixed Frequency modes, the GS4915 will measure the selected
input clock frequency to determine if it is in any of the following ranges: 27MHz ±
0.4%, 74.25MHz ± 0.4%, or 148.5MHz ± 0.4% (these ranges include the
74.25MHz/1.001 and 148.5MHz/1.001 video clock frequencies).
Table 3-2: GS4915 Frequency Modes
FCTRL[1:0]
Frequency Mode
00
Auto
01
Fixed –
27MHz ± 0.4%
10
Fixed –
74.25MHz ± 0.4%
11
Fixed –
148.5MHz ± 0.4%
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| GS6333UR19D1 | FC/ACP F.O. SINGLE MODE IN-LINE ATTENUATOR 10DB |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| GS4915_09 | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:ClockCleaner |
| GS4915-CNE3 | 制造商:Semtech Corporation 功能描述:QFN-40 pin (490/tray) |
| GS4915INE3 | 制造商:Gennum Corporation 功能描述:CLOCKCLEANER HD/SD VIDEO INPUT 40QFN 制造商:Gennum Corporation 功能描述:CLOCKCLEANER, HD/SD, VIDEO INPUT, 40QFN |
| GS4915-INE3 | 功能描述:IC CLK JITTER CLEANR 40QFN 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:ClockCleaner™ 標(biāo)準(zhǔn)包裝:1,000 系列:Precision Edge® 類型:時鐘/頻率合成器 PLL:無 輸入:CML，PECL 輸出:CML 電路數(shù):1 比率 - 輸入:輸出:2:1 差分 - 輸入:輸出:是/是 頻率 - 最大:10.7GHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-VFQFN 裸露焊盤，16-MLF? 供應(yīng)商設(shè)備封裝:16-MLF?（3x3） 包裝:帶卷 (TR) 其它名稱:SY58052UMGTRSY58052UMGTR-ND |
| GS4953 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:臺灣晶群科技 |
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