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參數(shù)資料
| 型號： | VSC7969WD2B |
| 廠商： | VITESSE SEMICONDUCTOR CORP |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | 3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, BCY4 |
| 封裝： | TO-46, 4 PIN |
| 文件頁數(shù)： | 8/14頁 |
| 文件大小： | 170K |
| 代理商： | VSC7969WD2B |
VITESSE
Advance Product Information
VSC7969
3.125Gb/s Integrated Transimpedance
and Limiting Amplifier with Signal Detect
Page 8
G52355-0, Rev 2.0
02/09/01
VITESSE
SEMICONDUCTOR CORPORATION
741 Calle Plano
Camarillo, CA 93012
Tel: (800) VITESSE
FAX: (805) 987-5896
Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Circuit Description
The VSC7969 data path consists of several stages: transimpedance input stage, limiting amplifier, and out-
put driver. The transimpedance amplifier accepts current from a photodetector connected to the input pad
‘
IN
’
and converts the input current to a differential output voltage. The signal then travels to the second stage limit-
ing amplifier which provides DC restoration, eliminating the DC component of the input signal. The linear pho-
tocurrent monitor and signal detect function is also provided by this stage. The final stage consists of an output
driver with a differential pair connected to V
CC
via 50
internal pull-up resistors. The overall effective differ-
ential transimpedance of the VSC7969 is typically 27k
. The limited output single-ended voltage swing is typ-
ically 250mVp-p.
Design Guidelines
Power Supply
The VSC7969 is supplied by a single supply voltage; for +3.3V operation, the supply votlage should be
applied to only V
CCS
. For +5V operation, the supply voltage should be applied to only V
CCD
.
Data Outputs
The outputs of the VSC7969 need to be AC-coupled. This capacitor will determine the low frequency cut-
off for the system, which is directly related to the receiver
’
s deterministic jitter. For ATM/SONET or other
applications using PRBS NRZ data, select a capacitor of at least 0.1μF or greater, which provides less than
32kHz low frequency cutoff. For Fibre Channel, Gigabit Ethernet, or other applications requiring 8B/10B data
coding, select a capacitor of at least 0.01μF or greater, which provides less than 320kHz low frequency cutoff.
The outputs can be used single-ended or differential. For best performance, differential operation is recom-
mended. If single-ended operation is necessary, the unused output should be AC-coupled and terminated with
an impedance equal to the load on the pin in use.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VSC7969YD1 | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect |
| VSC7969YD2 | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect |
| VSC7970 | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:1 to 4 Gbps Transimpedance Amplifiers with Photocurrent Monitor |
| VSC7971 | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:1 to 4 Gbps Transimpedance Amplifiers with Photocurrent Monitor |
| VSC7972 | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:1 to 4 Gbps Transimpedance Amplifiers with Photocurrent Monitor |
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