参数资料
型号: OP4008B
厂商: RFM
文件页数: 3/6页
文件大小: 0K
描述: IC OPT TIME CLK 669.327MHZ 8-SMC
标准包装: 200
类型: VCSO(SAW)
频率: 669.327MHz
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)
Load Recommendations for the OP4008B
The Q and Q outputs of RFM's OPB-series of SAW clocks are AC-
coupled internally. This allows customers to set the DC level of the
outputs with a simple resistor pair on each output to drive most any
application.
V DC = V LOAD *R1/(R1 + R2)
and
50 = R1*R2/(R1 + R2)
The values of the resistors R2 and R1 are given directly as:
R2 = 50*V LOAD /V DC
R1 = 1/(0.02 - (1/R2))
Vdc is the DC level desired on the outputs.
V load is the DC supply on the load resistors (typically 3.3 V).
V LOAD
3.3V
R2
R2
V TUNE
OP4005B
R1
V DC
V DC
R1
Load
The equations describe the voltage divider created by R1 & R2 and the equilivent load impedence set by the parrellel combination of R1 & R2 .
A given load type will have specifications that set Vdc . Choose an available V load that is 2x to 3x larger than the desired Vdc . This will allow R1 to be
expressed in terms of R2 .
The following table has some typical values for Vdc & V load for various ECL loads along with R1 & R2 values that are standard.
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
Vdc
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
Note that the OPB parts will drive negative ECL loads by applying negative voltage to the V load points in the circuit.
www.RFM.com E-mail: info@rfm.com
?2008-2010 by RF Monolithics, Inc.
Page 3 of 6
OP4008B - 2/8/10
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