VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet 2.5Gb/s High Speed Limiting Post Amplifier for OC-48/SDH-16 Applications VSC7958 Features • 2.5Gb/s Data Rates (OC-48/SDH-16) • Input Offset Error Cancellation • Single 5V Power Supply • Fully Differential Architecture General Description The Vitesse high speed limiting amplifier is intended for use as a post amplifier in wide band fiber optic links with data rates up to 2.5Gb/s. This amplifier provides very high sensitivity and broadband operation with a fully differential architecture. Additional features include on-chip, offset-correction circuitry to provide excellent pulse width distortion characteristics. VSC7958 Block Diagram VSS VBR VREF- GND Chip Boundary 50 VIN- VOUT- A1 VIN+ A2 VOUT+ 50 VREF+ - + VBF G52184-0, Rev 3.0 05/14/01 VBS © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: [email protected] Internet: www.vitesse.com Page 1 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet 2.5Gb/s High Speed Limiting Post Amplifier for OC-48/SDH-16 Applications VSC7958 Table 1: Electrical Specifications All min and max values are tested at VSS = -4.5V and -5.5V, unless otherwise noted. All min and max values are guaranteed from TCASE = 0°C to 85°C, unless otherwise noted. Symbol Parameter (1) VIN± (VIN+) - (VIN-) (1) (VREF+) - (VREF-) Min Typ Max Units Conditions Input Voltage Swing - - 800 mVp-p Single-ended source Input Voltage Swing - - 1600 mVp-p Differential source Input Offset Voltage Swing - 10 25 mV 320 500 1200 mVp-p - -0.5 - V (VOUT+) - (VOUT -) Output Voltage Swing VIN = 0 Differential Output Swing. VIN = 8mV, Differential Input peak-to-peak VOFFSET Output DC Offset Voltage Measured to ground PW% Output Pulse Width 90 100 110 % tR, tF Rise and Fall Time - 100 - ps 20%-80%, 25°C, VIN = 50mV G Small Signal Gain 26 30 45 dB VIN = 4mVp-p singleended fMAX(1) Small Signal -3dB Bandwidth - 3 - GHz 25°C, VIN = 4mVp-p fMIN(1) S11(1) S22(1) Low Frequency -3dB Cutoff - 30 - kHz 25°C, VIN = 4mVp-p Input Return Loss Reference to 50Ω - 15 - dB At 1.5GHz Output Return Loss Reference to 50Ω - 15 - dB At 1.5GHz ISS Supply Current - 80 100 mA NF(1) Noise Figure - 15 - dB 8kHz to 18GHz VNR(1) Input Referred Wide Band Noise - 170 - µVrms Total single-ended output noise voltage divided by small-signal gain. 8kHz to 18GHz θJC Thermal Resistance - 30 - °C/W Junction-to-case NOTE:(1) These values are not measured during production test. These values are results of engineering characterization. Page 2 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: [email protected] Internet: www.vitesse.com G52184-0, Rev 3.0 05/14/01 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet 2.5Gb/s High Speed Limiting Post Amplifier for OC-48/SDH-16 Applications VSC7958 Figure 1: Typical Output Voltage vs. Input Voltage of Limiting Amplifier Output Voltage vs. Input Voltage Single-Ended Output Voltage (mV) 1000 100 10 1 1 13 20 100 260 500 Single-Ended Input Voltage (mV) Absolute Maximum Ratings (1) (at TA = 25°C unless otherwise specified) Power Supply Voltage (VSS) ...............................................................................................................-7V to -0.5V Power Dissipation.............................................................................................................................................. 1W All Pins ................................................................................................................................................VSS to + .5V (VREF+) - (VIN+): .......................................................................................................................................... ±2V (VREF-) - (VIN-): ........................................................................................................................................... ±2V Storage Temperature Range (TSTG)................................................................................................ -40°C to 125°C Operating Temperature Range............................................................................................................0°C to 100°C NOTE: (1) CAUTION: Stresses listed under “Absolute Maximum Ratings” may be applied to devices one at a time without causing permanent damage. Functionality at or above the values listed is not implied. Exposure to these values for extended periods may affect device reliability. Recommended Operating Conditions Case Temperature Range (TC)..............................................................................................................0°C to 85°C Negative Voltage Rail (VSS) .............................................................................................................-5.5V to -4.7V Bit Rate = 2.488Gb/s NRZ and data pattern = 223 -1 PRBS, unless otherwise specified. G52184-0, Rev 3.0 05/14/01 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: [email protected] Internet: www.vitesse.com Page 3 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet 2.5Gb/s High Speed Limiting Post Amplifier for OC-48/SDH-16 Applications VSC7958 Package Pin Descriptions Figure 2: Pin Configuration .230 GND GND VBS VBF 16 GND 15 14 13 1 VOUT+ 2 VOUTGND 12 VREF+ .030 11 VIN+ 3 10 VIN- 4 9 VSC7958 VREF.012 5 6 7 8 GND GND VSS VBR (TOP VIEW) .366 .050 0.005 (SIDE VIEW) *All values are typical in inches Page 4 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: [email protected] Internet: www.vitesse.com G52184-0, Rev 3.0 05/14/01 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet 2.5Gb/s High Speed Limiting Post Amplifier for OC-48/SDH-16 Applications VSC7958 Package Information Figure 3: Package Dimensions E1 E D1 D A Key Dimension Tolerance A 0.054 REF A1 0.003 ±0.003 A2 0.050 REF D 0.366 ±0.010 D1 0.225 ±0.005 E 0.366 ±0.010 E1 0.225 ±0.005 L 0.020 ±0.005 e 0.030 REF b 0.012 θ A2 Typ. 0-10 R 0.013 ±0.003 R1 0.013 ±0.003 Shoulder 0.020 e All Dimensions in inches R Sholder —C— A1 b θ —C— R1 L LEAD COPLANARITY G52184-0, Rev 3.0 05/14/01 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: [email protected] Internet: www.vitesse.com Page 5 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet 2.5Gb/s High Speed Limiting Post Amplifier for OC-48/SDH-16 Applications VSC7958 Die Information Figure 4: Die Pad Information 1705µm Pad 18 VREF_N 1233µm Pad 17 VREFC_N Pad 16 VBR Pad 15 VSS_C Pad 14 VSS Pad 13 VSS Pad 12 VDD Pad 11 VDD Pad 10 Pad 9 VDD EDGE_SENSE Pad 8 VDD Pad19 VDD Pad 7 VDD Pad 20 VIN_N Pad Pad15 6 GND VOUT_N Pad 21 VDD Pad 5 VDD VSC7958 Top View Pad 22 VDD Pad 4 VDD Pad 23 VIN_P Pad 3 VOUT_P Pad 24 VDD Pad 2 VDD Pad 25 VREF_P Pad 26 VREFC_P Maximum Total Die Size: Die Thickness: Pad Size: Pad Passivation Opening: Pad 27 VBF Pad 28 VBS Pad 29 VDD Pad 30 VDD Pad 31 VDD Pad 8 VDD 1233µm x 1705µm 305µm 100µm x 100µm 90µm x 90µm This device requires external components when used in die form. Please contact your Vitesse sales representative for information. Page 6 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: [email protected] Internet: www.vitesse.com G52184-0, Rev 3.0 05/14/01 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet 2.5Gb/s High Speed Limiting Post Amplifier for OC-48/SDH-16 Applications VSC7958 Table 2: Pin Identifications Pin # Name Function 1, 4, 5, 6, 15, 16, and bottom heat spreader GND DEVICE GROUND The package bottom heat spreader should be connected to ground for the optimum thermal and electrical performance. 2 VOUT+ 3 VOUT- 7 VSS NEGATIVE DC SUPPLY 8 VBR DEVICE REFERENCE VOLTAGE This pin can either float or be set to an external -1.5V supply. 9 VREF- POSITIVE DATA OUTPUT NEGATIVE DATA OUTPUT NEGATIVE DATA INPUT REFERENCE This pin should be bypassed to ground with a 0.1µF cap and a 5Ω series resistor. 10 VIN- NEGATIVE DATA INPUT 11 VIN+ POSITIVE DATA INPUT 12 VREF+ 13 VBF INTERNAL TEST POINT Do not connect. 14 VBS INTERNAL TEST POINT Do not connect. POSITIVE DATA INPUT REFERENCE This pin should be bypasSed to ground with a 0.1µF cap and a 5Ω series resistor. Ordering Information The order number for this product is formed by a combination of the device number, and package style. VSC7958 XX Device Type VSC7958: 2.5Gb/s Limiting Amplifier Package Style CC: (Metal Glass - Formed Leads) X : (Bare Die) 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. G52184-0, Rev 3.0 05/14/01 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: [email protected] Internet: www.vitesse.com Page 7 VITESSE SEMICONDUCTOR CORPORATION 2.5Gb/s High Speed Limiting Post Amplifier for OC-48/SDH-16 Applications Preliminary Data Sheet VSC7958 This page left intentionally blank. Page 8 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: [email protected] Internet: www.vitesse.com G52184-0, Rev 3.0 05/14/01