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VSC7969WD1B 参数 Datasheet PDF下载

VSC7969WD1B图片预览
型号: VSC7969WD1B
PDF下载: 下载PDF文件 查看货源
内容描述: 3.125Gb / s的综合阻和限幅放大器,信号检测 [3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect]
分类和应用: 放大器
文件页数/大小: 14 页 / 172 K
品牌: VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
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VITESSE  
SEMICONDUCTOR CORPORATION  
Advance Product Information  
3.125Gb/s Integrated Transimpedance  
and Limiting Amplifier with Signal Detect  
VSC7969  
Signal Detect  
The signal detect feature of the VSC7969 provides a CMOS level output corresponding to the input current  
level to the transimpedance amplifier. The assert and deassert levels of the signal detect pin can be adjusted by  
placing an optional resistor from SD_ADJ to ground. The following tables show the two extremes at which the  
signal detect pin will operate; open circuit and short-ciruit to ground.  
Table 5: Signal Detect Function, SD_ADJ Open  
Electrical  
Min  
Typ  
Max  
Units  
Assert  
3
1
1
5
2.2  
2
9
3
4
µA  
µA  
dB  
Deassert  
Hysteresis  
With SD_ADJ (pin 16) shorted to ground, thresholds are 3dB higher, as shown in Table 6.  
Table 6: Signal Detect Function, SD_ADJ Shorted to Ground  
Electrical  
Min  
Typ  
Max  
Units  
Assert  
6
2
1
10  
4.4  
2
18  
6
µA  
µA  
dB  
Deassert  
Hysteresis  
4
Photodetector Current Monitor  
The IMON pin provides a linear measurement of the average input current from the photodetector to the  
transimpedance amplifier. For example, if 20µA is the average input current to the transimpedance amplifier,  
the current through the IMON pin will be 20µA (see the typical operating curve IMON Characteristic, 0µA to  
200µA). To use this feature, connect the IMON pin to V using a resistor less than 2k. If this feature is not  
CC  
used, the IMON pin can be left unconnected.  
© VITESSE SEMICONDUCTOR CORPORATION 741 Calle Plano Camarillo, CA 93012  
G52355-0, Rev 2.0  
02/09/01  
Page 9  
Tel: (800) VITESSE FAX: (805) 987-5896 Email: prodinfo@vitesse.com  
Internet: www.vitesse.com  
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