VSC7938 Просмотр технического описания (PDF) - Vitesse Semiconductor
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VSC7938 Datasheet PDF : 16 Pages
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VITESSE
SEMICONDUCTOR CORPORATION
SONET/SDH 3.125Gb/s
Laser Diode Driver with Automatic Power Control
Preliminary Data Sheet
VSC7938
Electrical Characteristics
Table 1: AC Specifications
AC specifications are guaranteed by design and characterization. Typical values are for 3.3V.
Symbol
Parameter
Min Typ Max Units
Conditions
tSU
Input Latch Setup Time
tH
Input Latch Hold Time
Enable/Start-up Delay
100
100
250
ps LATCH=high
ps LATCH=high
ns
tR
tF
PWD
Output Rise Time
Output Fall Time
Pulse Width Distortion
60
80
60
80
10
50
ps 20% to 80%
ps 20% to 80%
ps See Notes 1, 2
CIDMAX Maximum Consecutive Identical Digits 80
bits
tJ
Jitter Generation
7
20
psp-p
Jitter BW=12kHz to 20MHz,
0-1 pattern.
NOTES:(1) Measured with 622Mb/s 0-1 pattern, LATCH=high. (2) PWD = (wider pulse - narrower pulse) / 2).
Table 2: DC Specifications
Symbol
Parameter
Min Typ Max Units
Conditions
ICC
Supply Current
IBIAS
Bias Current Range
IBIAS-OFF Bias Off Current
TBD 45
RMODSET=7.3kΩ
mA
RBIASMAX=4.8kΩ
IBIAS and IMOD excluded
VCC=5V
1
100
mA Voltage at BIAS pin=(VCC-1.6)
100
µA
ENABLE=low or
DISABLE=high(1)
SBIAS
Bias Current Stability
Bias Current Absolute Accuracy
230
ppm/°C APC Open loop. IBIAS=100mA
900
APC Open loop. IBIAS=1mA
±15
% Refers to part-to-part variation
VRMD
Monitor Diode Reverse Bias Voltage
1.5
V
IMD
Monitor Diode Reverse Current Range 18
1000 µA
-480 -50
Monitor Diode Bias Setpoint Stability
90
480
ppm/°C
IMD=1mA(2)
IMD=18µA(2)
Monitor Diode Bias Absolute Accuracy -15
15
% Refers to part-to-part variation
IMOD
Modulation Current Range
IMOD-OFF Modulation Off Current
5
60
mA
200
µA
ENABLE=low or
DISABLE=high(1)
Modulation Current Absolute Accuracy
±15
% See Note 2
Modulation Current Stability
-480 -50
250
480 ppm/°C IMOD=60mA
IMOD=5mA
NOTES: (1) Both IBIAS and IMOD will turn off if any of the current set pins are grounded. (2) Assumes laser diode to monitor diode transfer func-
tion does not change with temperature.
Page 2
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
G52349-0, Rev 3.0
01/20/01
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