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VSC7938 Datasheet(PDF) 2 Page - Vitesse Semiconductor Corporation |
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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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