參數資料
型號: VSC7940W
廠商: VITESSE SEMICONDUCTOR CORP
元件分類: 其它接口
英文描述: SONET/SDH 3.125Gb/s Laser Diode Driver with Automatic Power Control
中文描述: SPECIALTY INTERFACE CIRCUIT, UUC48
封裝: DIE-48
文件頁數: 13/16頁
文件大?。?/td> 167K
代理商: VSC7940W
VITESSE
Preliminary Data Sheet
VSC7940
SONET/SDH 3.125Gb/s
Laser Diode Driver with Automatic Power Control
G52357-0, Rev 3.2
05/11/01
Page 13
VITESSE
SEMICONDUCTOR CORPORATION
741 Calle Plano
Camarillo, CA 93012
Tel: (800) VITESSE
FAX: (805) 987-5896
Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Select Resistors for MODMON and BIASMON
Assuming the modulation and bias currents never exceed 120mA, the following equations provide values
for the resistor at MODMON, R
MODMON
, and the resistor at BIASMON, R
BIASMON
:
R
MODMON
= 1V * 28 / 120mA = 233
R
BIASMON
= 1.6V * 35 / 120mA = 467
Standard values for these values are R
MODMON
= 232
and R
BIASMON
= 464
. A voltage of 4.8V at
MODMON would indicate a modulation current of:
I
MOD
= (5.2V - 4.8V) * 28 / 232mA = 48mA
Wire Bonding
For best performance, gold ball-bonding techniques are recommended. Wedge bonding is not recom-
mended. For best performance and to minimize inductance keep wire bond lengths short.
PCB Layout Guidelines
Use high frequency PCB layout techniques with solid ground planes to minimize crosstalk and EMI. Keep
high speed traces as short as possible for signal integrity. The output traces to the laser diode must be short to
minimize inductance. Short output traces will provide best performance.
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