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VSC7938 Datasheet(PDF) 2 Page - Vitesse Semiconductor Corporation

Part No. VSC7938
Description  Laser Diode Driver with Automatic Power Control
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Maker  VITESSE [Vitesse Semiconductor Corporation]
Homepage  http://www.vitesse.com
Logo VITESSE - Vitesse Semiconductor Corporation

VSC7938 Datasheet(HTML) 2 Page - Vitesse Semiconductor Corporation

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VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC7938
SONET/SDH 3.125Gb/s
Laser Diode Driver with Automatic Power Control
Page 2
G52349-0, Rev 3.0
01/20/01
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Electrical Characteristics
Table 1: AC Specifications
AC specifications are guaranteed by design and characterization. Typical values are for 3.3V.
NOTES:(1) Measured with 622Mb/s 0-1 pattern, LATCH=high. (2) PWD = (wider pulse - narrower pulse) / 2).
Table 2: DC Specifications
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.
Symbol
Parameter
Min
Typ
Max
Units
Conditions
tSU
Input Latch Setup Time
100
ps
LATCH=high
tH
Input Latch Hold Time
100
ps
LATCH=high
Enable/Start-up Delay
250
ns
tR
Output Rise Time
60
80
ps
20% to 80%
tF
Output Fall Time
60
80
ps
20% to 80%
PWD
Pulse Width Distortion
10
50
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.
Symbol
Parameter
Min
Typ
Max
Units
Conditions
ICC
Supply Current
TBD
45
mA
RMODSET=7.3kΩ
RBIASMAX=4.8kΩ
IBIAS and IMOD excluded
VCC=5V
IBIAS
Bias Current Range
1
100
mA
Voltage at BIAS pin=(VCC-1.6)
IBIAS-OFF
Bias Off Current
100
µA
ENABLE=low or
DISABLE=high(1)
SBIAS
Bias Current Stability
230
ppm/
°C
APC Open loop. IBIAS=100mA
900
APC Open loop. IBIAS=1mA
Bias Current Absolute Accuracy
±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
Monitor Diode Bias Setpoint Stability
-480
-50
480
ppm/
°C
IMD=1mA
(2)
90
IMD=18µA
(2)
Monitor Diode Bias Absolute Accuracy
-15
15
%
Refers to part-to-part variation
IMOD
Modulation Current Range
5
60
mA
IMOD-OFF
Modulation Off Current
200
µA
ENABLE=low or
DISABLE=high(1)
Modulation Current Absolute Accuracy
±15
%
See Note 2
Modulation Current Stability
-480
-50
480
ppm/
°C
IMOD=60mA
250
IMOD=5mA


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