vsc7925 Vitesse Semiconductor Corp, vsc7925 Datasheet

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vsc7925

Manufacturer Part Number
vsc7925
Description
Sonet/sdh 2.5gb/s Laser Diode Driver
Manufacturer
Vitesse Semiconductor Corp
Datasheet
Preliminary Data Sheet
VSC7925
G52157-0, Rev 3.2
05/01/01
Features
General Description
and bias FETs. Laser bias and modulation currents are set by external components allowing precision monitor-
ing 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
quency decoupling capacitors.P
VSC7925 Block Diagram
• 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
NCLK*
NDIN*
CLK
** On-die components
DIN
The VSC7925 is a single 5V supply, 2.5Gb/s laser diode driver with direct access to the laser modulation
* Terminated to off-chip capacitor
10pF
10pF
50
50
**
**
**
**
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
VITESSE
SEMICONDUCTOR CORPORATION
D
Q
Internet: www.vitesse.com
VIB
VIP
Applications
• SONET/SDH at 622Mb/s, 1.244Gb/s, and
• Full-Speed Fibre Channel (1.062Gb/s)
DCC
DCC
2.488Gb/s
SONET/SDH 2.5Gb/s Laser Diode Driver
MK
NMK
termination resistors and high fre-
MIP
I
MOD
MIB
NIOUT
IOUT
IBIAS
I
BIAS
Page 1

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vsc7925 Summary of contents

Page 1

... Ceramic Package 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 monitor- ing and setting of the current levels. Data density outputs are provided to allow the user to adjust the laser bias in unbalanced data applications ...

Page 2

... Clock Input and Clock Reference DC 1 Duty Cycle Control, Leave Floating 24 Rating Min Typ Max 300 1500 -3.3 -1.3 -1200 -500 -2000 -1600 Internet: www.vitesse.com Preliminary Data Sheet VSC7925 Description Limit V to -6.0V CC -55° 125°C -65°C to +150°C Units Conditions -2. -5. ...

Page 3

... Preliminary Data Sheet VSC7925 Table 4: Recommended Operating Conditions Symbol Parameter GND Positive Voltage Rail V Negative Voltage Rail SS T Operational Temperature9.0 pt CASE KF NOTE: (1) Lower limit of specification is ambient temperature and upper limit is case temperature. Table 5: Power Dissipation Symbol Parameter I Power Supply Current (V VSS ...

Page 4

... Figure 2: Clock and Data Input Structure X 0V (GND) 2000 VREF 10pF 2000 2k X -5.2V (VSS) Figure 3: Single-Ended Operation 0.1 f DIN NDIN 0.1 f GND 0.1 f CLK NCLK 0.1 f GND Internet: www.vitesse.com Preliminary Data Sheet VSC7925 •Nominal VREF Value = -2.5V •All Values Nominal 7925 VSC7925 G52157-0, Rev 3.2 05/01/01 ...

Page 5

... Preliminary Data Sheet VSC7925 X VIP G52157-0, Rev 3.2 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 05/01/01 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com VITESSE SEMICONDUCTOR CORPORATION SONET/SDH 2.5Gb/s Laser Diode Driver Figure 4: Control Signals VIP and VIB ...

Page 6

... SONET/SDH 2.5Gb/s Laser Diode Driver Figure 6: Pad Assignments for VSC7925 Die 50 PAD 34 PAD 33 PAD 32 PAD 31 PAD 30 PAD 29 PAD 28 PAD 27 PAD 26 120 DCC VSS 120 PAD 1 DINTERM 150 PAD 2 DINTERM PAD 3 DIN 30 PAD 4 GND PAD 5 GND PAD 6 CLOCK PAD 7 CLOCKTERM PAD 8 CLOCKTERM ...

Page 7

... Preliminary Data Sheet VSC7925 Pin Diagram - 24-Pin Ceramic Package NDIN DIN GND GND CLK NCLK Note: G52157-0, Rev 3.2 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 05/01/01 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com VITESSE SEMICONDUCTOR CORPORATION SONET/SDH 2 ...

Page 8

... Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com VITESSE SEMICONDUCTOR CORPORATION Side View NOTES: Drawing not to scale. Internet: www.vitesse.com Preliminary Data Sheet VSC7925 Key 9.5 0.374 B 7.7 0.303 C 2.0 0.079 D 1.27 0.050 E 0.30 0.012 F 1.7 0.067 G 0.6 0.024 18 H 11.5 ...

Page 9

... Preliminary Data Sheet VSC7925 Package Information - 24 Pin Ceramic Package (Straight Leads) Top View 24 INDEX G52157-0, Rev 3.2 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 05/01/01 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com ...

Page 10

... Ordering Information The order number for this product is formed by a combination of the device number, and package style. Device Type VSC7925: 2.5Gb/s Laser Diode Driver 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 ...

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