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VSC7938 Datasheet(PDF) 1 Page - Vitesse Semiconductor Corporation |
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VSC7938 Datasheet(HTML) 1 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 G52349-0, Rev 3.0 Page 1 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 Features Applications General Description The VSC7938 is a single 3.3V or 5V supply laser diode driver specially designed for SDH/SONET applica- tions up to 3.125Gb/s. External resistors set a wide range of bias and modulation currents for driving the laser. Data and clock inputs accept differential PECL signals. The automatic power control (APC) loop maintains a constant average optical power over temperature and lifetime. The dominant pole of the APC loop can be con- trolled with an external capacitor. Other features include enable/disable control, short-circuit protection for the modulation and bias inputs, short rise and fall times, programmable slow-start circuit to set laser turn-on delay, and failure-monitor output to indicate when the APC loop is unable to maintain the average optical power. The VSC7938 is available in die form or in a 48-pin TQFP package. Block Diagram • Power Supply: 3.3V or 5V ±5% • AC-Coupled to Laser Diode • Programmable Modulation Current: 5mA to 60mA • Programmable Bias Current: 1mA to 100mA • Enable/Disable Control • Typical Rise/Fall Times of 60ps • Automatic Optical Average Power Control • Supply Current of 33mA at 3.3V 3.3V Operation Q SET CLR Q D MUX DATA+ APC DATA- CLK+ CLK- ENABLE BIAS IOUT+ IOUT- MD MODSET BIASMAX CAPC APCSET FAIL LATCH C D 1nF V CC V CC C F R F DISABLE SLWSTRT • SDH/SONET at 622Mb/s, 1.244Gb/s, 2.488Gb/s, 3.125Gb/s • Full-Speed Fibre Channel (1.062Gb/s) |
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