参数资料
型号: OP4012B
厂商: RFM
文件页数: 5/7页
文件大小: 0K
描述: IC OPT TIMECLK 644.53125MHZ 8SMC
标准包装: 200
类型: VCSO(SAW)
频率: 644.53125MHz
功能: 三态(输出启用)
电源电压: 3.13V ~ 5.25V
频率稳定性: ±100ppm
工作温度: -40°C ~ 85°C
电流 - 电源(最大): 70mA
安装类型: 表面贴装
尺寸/尺寸: 0.530" L x 0.360" W(13.46mm x 9.14mm)
高度: 0.076"(1.93mm)
封装/外壳: 8-SMD
包装: 带卷 (TR)
The following table provides R1 and R2 values for six high-speed logic families commonly used in optical data communications systems. Note that the
OP4012B can be used with logic families that run from a negative power supply voltage by simply using a negative V LOAD voltage.
Load Type
10K 3.3 V PECL
100K 3.3 V PECL
10K 5 V PECL
100K 5 V PECL
10K -5 V NECL
100K -5 V NECL
V DC
1.95
1.88
3.65
3.58
-1.30
-1.42
R1
120
120
180
180
240
240
R2
91
91
68
68
62
62
V LOAD
3.3 V
3.3 V
5.0 V
5.0 V
-5.0 V
-5.0 V
OP4012B Enable/Disable
Pin 3 on the OP4012B is the enable/disable control pin for the clock outputs. When Pin 3 is grounded, full output power is available from the clock. When
Pin 3 is pulled to Vcc, the power on the clock outputs is decreased at least 25 dB.
PLL for Generating a High Stability 644.53125 MHz Clock
External
Reference
Phase
Detector
+Vcc
Internal
Loop Filter
Tune
OP4012B
Q
Q
Reference
(holdover)
÷ N
Example OP4012B Phase-Locked Loop Application
One of the most important applications for the OP4012B is in a PLL circuit used to generate a very high quality 644.53125 MHz clock. The PLL combines
the long-term stability of a precision external or internal 20.1416 MHz reference clock with the very low jitter and phase noise of the OP4012B. A block
diagram of the PLL is shown in Figure 6. A sample of the OP4012B output is divided by 32 and is compared to 20.1416 MHz reference clock in the phase
detector. The loop filter at the output of the phase detector is set to a very low bandwidth (less than 50 Hz typical). This imparts the long-term stability of
the precision 20.1416 MHz reference to the OP4012B without degrading the OP4012B's low jitter and phase noise.
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Page 5 of 7
OP4012B - 2/4/10
相关PDF资料
PDF描述
OP4013B IC OPT TIMECLK 693.48342MHZ 8SMC
OP4014B IC OPT TIME CLK 627.329MHZ 8-SMC
OP4015B IC OPT TIME CLK 780.881MHZ 8-SMC
ORD211-2030 SWITCH REED SPST-NO 10MM OKI
ORD213S-1T-1015 REED SWITCH 24VDC 1W SMD TR
相关代理商/技术参数
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OP4014B 功能描述:IC OPT TIME CLK 627.329MHZ 8-SMC RoHS:是 类别:晶体和振荡器 >> 振荡器 系列:- 标准包装:1 系列:VG-4512CA 类型:VCXO 频率:153.6MHz 功能:三态(输出启用) 输出:LVPECL 电源电压:3.3V 频率稳定性:- 工作温度:-40°C ~ 85°C 电流 - 电源(最大):60mA 额定值:- 安装类型:表面贴装 尺寸/尺寸:0.276" L x 0.197" W(7.00mm x 5.00mm) 高度:0.071"(1.80mm) 封装/外壳:6-SMD,无引线(DFN,LCC) 包装:Digi-Reel® 电流 - 电源(禁用)(最大):- 其它名称:SER3790DKR
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