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| VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet VSC7925 Features * Rise Times Less Than 100ps * High Speed Operation (Up to 2.5Gb/s NRZ Data) * Single-ended Inputs * Single Supply * Direct Access to Modulation and Bias FET's * Data Density Monitors * On-Chip Reclocking Register * 24-Pin Ceramic Package SONET/SDH 2.5Gb/s Laser Diode Driver Applications * SONET/SDH at 622Mb/s, 1.244Gb/s, and 2.488Gb/s * Full-Speed Fibre Channel (1.062Gb/s) General Description The VSC7925 is a single 5V supply, 2.5Gb/s laser diode driver with direct access to the laser modulation and bias FETs. Laser bias and modulation currents are set by external components allowing precision monitoring and setting of the current levels. Data density outputs are provided to allow the user to adjust the laser bias in unbalanced data applications. Clock and data inputs have nominal 50 termination resistors and high frequency decoupling capacitors.P VSC7925 Block Diagram MK NMK NIOUT DIN 50 NDIN* 10pF ** DCC CLK 50 NCLK* 10pF ** ** VIB MIP * Terminated to off-chip capacitor ** On-die components MIB VIP IMOD IBIAS ** D Q DCC IBIAS IOUT G52157-0, Rev 3.2 05/01/01 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com Page 1 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet SONET/SDH 2.5Gb/s Laser Diode Driver Table 1: Signal Pin Reference Signal DIN, NDIN MK, NMK NIOUT IOUT VSS GND VIP MIP VIB MIB IBIAS CLK, NCLK DCC Total Pins VSC7925 Description Data Input and Data Reference Data Density Differential Outputs Laser Modulation Current Output (Complementary) Laser Modulation Current Output (To Laser Cathode) Negative Voltage Rail Positive Voltage Rail Modulation Gate Node Modulation Source Node Bias Gate Node Bias Source Node Laser Bias Output (To Laser Cathode) Clock Input and Clock Reference Duty Cycle Control, Leave Floating Type In Out Out Out Pwr Pwr In In In In Out In In Level ECL # Pins 2 2 1 1 Pwr Pwr DC DC DC DC DC DC 4 6 1 1 1 1 1 2 1 24 Table 2: Absolute Maximum Ratings Symbol VSS TJ TSTG Rating Negative Power Supply Voltage Maximum Junction Temperature Storage Temperature Limit VCC to -6.0V -55C to + 125C -65C to +150C Table 3: High-Speed Inputs and ECL Outputs Symbol VIN VCM VOH VOL Parameter Single-ended Input Voltage Swing Differential Input Common Mode Range ECL Output High Voltage ECL Output Low Voltage Min 300 -3.3 -1200 -2000 Typ Max 1500 -1.3 -500 -1600 Units mV V mV mV Conditions VCM = -2.5V VSS = -5.2V 50 to -2.0V 50 to -2.0V Page 2 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com G52157-0, Rev 3.2 05/01/01 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet VSC7925 Table 4: Recommended Operating Conditions Symbol GND VSS TCASE KF SONET/SDH 2.5Gb/s Laser Diode Driver Parameter Positive Voltage Rail Negative Voltage Rail Operational Temperature9.0 pt Min -5.5 -40 Typ 0 -5.2 Max -4.9 85 Units V V C Conditions Power dissipation = 1.3W Ceramic Package NOTE: (1) Lower limit of specification is ambient temperature and upper limit is case temperature. Table 5: Power Dissipation Symbol IVSS PD Parameter Power Supply Current (VSS) Total Power Dissipation Min Typ Max 220 1200 Units mA mW Conditions IMOD = IBIAS = 0mA VSS = -5.5V, IMOD = IBIAS = 0mA, RLOAD = 25 to GND Table 6: Laser Driver DC Electrical Specifications Symbol IBIAS IMOD VIB VIP VOCM Parameter Programmable Laser Bias Current Programmable Modulation Current Laser Bias Control Voltage Laser Modulation Control Voltage Output Voltage Compliance Min 2 2 Typ - Max 50 60 VSS + 2.1 VSS + 2.1 Units mA mA V V V Conditions IBIAS = 50mA IMOD= 60mA VSS = -5.2V GND -2.5V Table 7: Laser Driver AC Electrical Specifications Symbol tR, tF tSU tH Parameter Output Rise and Fall Times Data to Clock Setup Time Hold Time Min Typ Max 100 Units ps ps ps Conditions 25 load, 20%-80%, 15mA < IMOD < 60mA, IBIAS = 20mA 50 50 G52157-0, Rev 3.2 05/01/01 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com Page 3 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet SONET/SDH 2.5Gb/s Laser Diode Driver VSC7925 Figure 1: Laser Driver Maximum Case Temperature vs. Modulation Current CASE TEMPERATURE vs. MODULATION CURRENT 90 80 Case Temperature (oC) 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 Modulation Current (mA) 70 80 Figure 2: Clock and Data Input Structure X 0V (GND) DIN (CLK) X 50 50 2000 2k VREF 3 10pF 2000 2k + - NDIN (NCLK) X *Nominal VREF Value = -2.5V *All Values Nominal X 0V (GND) X -5.2V(VSS) Figure 3: Single-Ended Operation 7925 VSC7925 DIN NDIN 0.1f DATA SOURCE 0.1f CLOCK SOURCE 0.1f GND CLK NCLK 0.1f GND Page 4 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com G52157-0, Rev 3.2 05/01/01 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet VSC7925 I (MIB) 50 mA SONET/SDH 2.5Gb/s Laser Diode Driver Figure 4: Control Signals VIP and VIB VIB 2.1V Typical Bias Current v.s. Bias Voltage I (MIP) 60 mA 2.1V VIP Typical Modulation Current v.s. Modulation Voltage Figure 5: Simplified Output Structure NIOUT IOUT IBIAS X X X VIP X IMOD OUTPUT DIFF PAIR IBIAS X VIB X MIP X MIB G52157-0, Rev 3.2 05/01/01 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com Page 5 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet SONET/SDH 2.5Gb/s Laser Diode Driver Figure 6: Pad Assignments for VSC7925 Die VSC7925 1720 1620 50 50 50 120 120 150 PAD 34 PAD 33 PAD 32 PAD 31 PAD 30 PAD 29 DCC VSS VSS VSS VSS VIP PAD 1 DINTERM PAD 2 DINTERM PAD 3 DIN PAD 4 GND PAD 5 GND PAD 6 CLOCK PAD 7 CLOCKTERM PAD 8 CLOCKTERM VSS PAD 9 VSS PAD 10 GND PAD 11 PAD 28 PAD 27 PAD 26 MIP MIP MIB PAD 25 VIB PAD 24 GND0 PAD 23 OUT PAD 22 OUT PAD 21 GND0 PAD 20 GND0 PAD 19 NOUT PAD 18 IBIAS 30 1620 1720 GND GND GND GND NMARK MARK PAD 12 PAD 13 PAD 14 PAD 15 PAD 16 PAD 17 Dimensions in micrometers. 50 1) 2) 3) 4) 5) Die size = 1620m x 1620m Actual die size = 1720m x 1720m (after the die are cut up) Pad size = 120m x 120m Pad pitch = 150m Space between pads = 30m Page 6 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com G52157-0, Rev 3.2 05/01/01 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet VSC7925 Pin Diagram - 24-Pin Ceramic Package SONET/SDH 2.5Gb/s Laser Diode Driver DCC NDIN DIN GND GND CLK NCLK 24 1 2 3 4 5 6 7 23 22 21 20 19 18 17 16 15 14 MIB VSS VSS MIP VIP VIB GND IOUT GND NIOUT IBIAS 8 9 10 11 13 12 VSS GND GND GND MK Note: Package lid and bottom heat spreader are electrically connected to GND within the package. MK G52157-0, Rev 3.2 05/01/01 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com Page 7 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet SONET/SDH 2.5Gb/s Laser Diode Driver VSC7925 Package Information - 24 Pin Ceramic Package (Formed Leads) Top View Key A 24 23 22 21 20 19 mm 9.5 7.7 2.0 1.27 0.30 1.7 0.6 11.5 0.125 8.51 In 0.374 0.303 0.079 0.050 0.012 0.067 0.024 0.453 0.005 0.335 A B C D INDEX E 1 2 3 A 4 5 6 15 14 13 17 16 18 E F G H I J 7 8 9 10 11 D 12 Side View B I J H C G F NOTES: Drawing not to scale. Package #: 101-000-0 Issue #:1 Page 8 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com G52157-0, Rev 3.2 05/01/01 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet VSC7925 SONET/SDH 2.5Gb/s Laser Diode Driver Package Information - 24 Pin Ceramic Package (Straight Leads) Top View Key A 24 23 22 21 20 19 mm 9.5 7.7 5.8 1.27 0.30 1.7 0.6 9.53 0.125 8.51 In 0.374 0.303 .230 0.050 0.012 0.067 0.024 0.375 0.005 0.335 A B C D E E INDEX F 18 17 16 15 14 13 1 2 3 A 4 5 6 G H I J 7 8 9 10 11 D 12 Side View B I G F C H C NOTES: Drawing not to scale. Package #: 101-000-0 Issue #:1 G52157-0, Rev 3.2 05/01/01 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com Page 9 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet SONET/SDH 2.5Gb/s Laser Diode Driver VSC7925 Ordering Information The order number for this product is formed by a combination of the device number, and package style. VSC7925 Device Type VSC7925: 2.5Gb/s Laser Diode Driver XX Package Style KF: (Ceramic - Straight Leads) KFL: (Ceramic- Formed Leads) Notice Vitesse Semiconductor Corporation ("Vitesse") provides this document for informational purposes only. This document contains pre-production information about Vitesse products in their concept, development and/or testing phase. All information in this document, including descriptions of features, functions, performance, technical specifications and availability, is subject to change without notice at any time. Nothing contained in this document shall be construed as extending any warranty or promise, express or implied, that any Vitesse product will be available as described or will be suitable for or will accomplish any particular task. Vitesse products are not intended for use in life support appliances, devices or systems. Use of a Vitesse product in such applications without written consent is prohibited. Page 10 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com G52157-0, Rev 3.2 05/01/01 |
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