VITESSE SEMICONDUCTOR CORPORATION Advance Product Information 3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect VSC7969 Features Applications • Integrated TIA and Limiting Amplifier • Low Power Consumption for SFF Applications • TO Package-Compatible Layout • On-Chip Signal Detect • On-Chip Linear Photocurrent Monitor • Single 3.3V Supply • 5V Supply Operation via Wirebond Option • Compatible with PIN or Avalanche Detectors • Packages: 16-Pin TSSOP, TO-46, Bare Die • 2.488Gb/s, 3.125Gb/s SONET OC-48/ SDH STM-16 • 2.125Gb/s Fibre Channel • 2.5Gb/s or 3.125Gb/s Ethernet Applications with 8B/10B Overhead • SFF Transceivers General Description The VSC7969 is a 3.125Gb/s transimpedance amplifier IC with a built-in limiting amplifier, a signal detect feature and a photocurrent monitor. The VSC7969 does not require any external electrical components in the construction of a high performance optical receiver such as for SONET/SDH applications. The analog output is a differential signal with a minimum amplitude of 200mVp-p (single-ended). The VSC7969 operates with a single power supply with a maximum power dissipation of 300mW. A PIN photodiode or APD can be connected and separately biased to provide optimal performance. The VSC7969 provides filtered bias for MSM and PIN photodetectors; applications using an APD photodetector must supply bias separately. The VSC7969 also provides a photocurrent monitor whose output is linearly proportional to the input photocurrent. The VSC7969 can operate from a single +3.3V supply or a +5V or -5.2V supply. The VSC7969 is offered in die form and in a 16-pin plastic thin-shrink small outline package (TSSOP-16). A fully tested TO-46 outline packaged receiver with a photodetector is also available. Block Diagram VCCS Filter +3.3V Regulator +5V VCCD +3.3V 50Ω Dual power supply pins are provided for +5V or +3.3V operation. Only one power supply pin should be connected. GND Outputs need to be AC-coupled 50Ω VOUTP In VOUTN Signal Detect 0.1µF 0.1µF SD_OUT SD_ADJ VSC7969 G52355-0, Rev 2.0 02/09/01 Monitor IMON © 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 Advance Product Information 3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect VSC7969 Electrical Characteristics Table 1: AC Specifications Symbol Parameter Min Typ Max Units Conditions 2.2 mA Peak-to-peak AC current amplitude ∆IPH Input Photocurrent Swing IPHS-AVG Average Photocurrent Sensitivity 4 µA -23dBm average optical power with a detector responsitivity of 0.8A/W. IPHS-PEAK Peak Input Photocurrent Sensitivity 8 µA -23dBm average optical power with a detector responsitivity of 0.8A/W. ∆VOUT-SE Single-Ended Output Voltage Amplitude 200 250 300 mV Single-ended peak-to-peak measurement, IIN >20µA. ∆VOUT-DIFF Differential Output Voltage Amplitude 400 500 600 mV Differential peak-to-peak measurement, IIN >20µA. tR, tF Rise and Fall Time 60 100 ps At 2.2mAp-p input photocurrent swing. 20% to 80%. ZT(1) Transimpedance Gain 27k 40k Ω Differential measurement ∆ZT(1) Ripple in Passband Transimpedance dB Modulation frequency between FL and BW BW Upper -3dB Bandwidth FL Lower -3dB Cutoff Frequency ZO Output Impedance PSRR Power Supply Rejection Ratio TBD INOISE Input-Referred rms Noise Current 500 CPD Photodetector Capacitance SDH 20k 1 2.2 2.5 3.0 GHz Referenced to 10MHz, CPD = 0.6pF 100 kHz Referenced to 10MHz, CPD = 0.6pF with no external components 50 Ω Single-ended nA 30kHz to 2.5GHz 0.4 0.6 0.8 pF Bias voltage on detector at 2.0V Signal Detect Hysterisis 1 2 4 dB Electrical measurement on SD pin SDA-OPEN Signal Detect Assertion Level 3 5 9 µA Average photocurrent with SD open. SDD-OPEN Signal Detect Deasseration Level 1.0 2.2 3.0 µA Average photocurrent with SD open. SDA-SHORT Signal Detect Asseration Level 6 10 18 µA Average photocurrent with SD shorted to ground. SDD-SHORT Signal Detect Deasseration Level 2.0 4.4 6.0 µA Average photocurrent with SD shorted to ground. SDHIGH Signal Detect HIGH Logic Level VCCS - 0.3 SDLOW Signal Detect LOW Logic Level 0.5 Page 2 V 0.8 V © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: [email protected] Internet: www.vitesse.com G52355-0, Rev 2.0 02/09/01 VITESSE SEMICONDUCTOR CORPORATION Advance Product Information 3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect VSC7969 Symbol MON Parameter Min Typ Slope of Linear Analog Photocurrent Monitor vs Input Optical Power Max 0.8 Units Conditions µA/µW 0Ω to 2kΩ to VCC with a detector responsitivity of 0.8A/W DC Duty Cycle -5 +5 % IMONRANGE Photocurrent Monitor Linearity Range 5 200 µA 0 10 µA IMONOFFSET Photocurrent Monitor Offset RJ DJ (2) Random Jitter Deterministic Jitter (3) TBD ps Peak-to-peak TBD ps Peak-to-peak NOTES: (1) The transimpedance gain is defined as ZT = (∆VOUT - DIFF)/∆IPH. (2) Using 1111100000 pattern at 2.5Gb/s to measure the standard deviation of the edge of the pattern, multiply the standard deviation by 14 to achieve the total random jitter. (3) +K28.5 - K28.5 (00111110101100000101). Table 2: DC Specifications Symbol GND VCCS VCCD ICC VOUT-CM VANODE VCATHODE VCAT-EXT VAPD Parameter Min Typ Max Units Negative Supply Rail Positive Supply Rail for 3.3V Operation Positive Supply Rail for 5V Operation Power Supply Current 3.0 4.5 0 3.3 5.0 65 3.6 5.5 75 V V V mA 1.0 V VCCS V 10 V VCCS 125mV Common-Mode Voltage on Output Pins Internal DC Bias Voltage on Detector Anode Contact Interal DC Bias Voltage on Detector Cathode Contact External DC Bias Voltage Permissable on Detector Cathode Contact External DC Bias Voltage for Use with Avalanche Photodetector 0.8 0.9 VCCS 0.15V 3.3 60 Conditions 3.3V Applicable to VOUTP and VOUTN pins at 50Ω load. V Absolute Maximum Ratings(1) (at TA = +25°C, unless otherwise specified) Power Supply Voltage (VCCS)......................................................................................................................... 3.6V Power Supply Voltage (VCCD) ........................................................................................................................ 5.5V Junction Temperature Range ........................................................................................................ -40°C to +125°C Storage Temperature Range ......................................................................................................... -40°C to +125°C Relative Ambient Humidity ................................................................................................................. 85%/+85°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 Positive Voltage Supply (VCCS) ...................................................................................................................... 3.3V Positive Voltage Supply (VCCD)...................................................................................................................... 5.0V Negative Voltage Rail (GND) ............................................................................................................................ 0V Ambient Temperature Range (TA)(1) .............................................................................................. -40°C to +85°C G52355-0, Rev 2.0 02/09/01 © 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 Advance Product Information 3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect VSC7969 Bare Die Descriptions Figure 1: Pad Assignments 1467µm (57.2mil) Pad 6 VOUTN 1143µm (45.0mil) Pad 7 SD_OUT Pad 8 GND Pad 9 VOUTN Pad 10 GND Pad 11 VOUTP Pad 12 GND Pad 13 IMON Pad 14 VOUTP Pad 5 SD_ADJ Pad 15 GND Pad 4 SD_TP Pad 16 CSDN Pad 3 GND Pad 17 CSDP VSC7969 Pad 2 BG_VREF Pad 18 GND Pad 1 GND Pad 19 GND Pad 26 VCCD Pad 25 VCCS Pad 24 GND Pad 23 IN Pad 22 FILTER Pad 21 GND Pad 20 GND Die Size: 1143µm x 1453µm (45.0mil x 57.2mil) Die Thickness: 279µm (11.0mil) Pad Size: 100µm x 100µm (3.9mil x 3.9mil) Pad Passivation Opening: 86µm x 86µm (3.4mil x 3.4mil) 143µm (5.6mil) Scribe Size: 143µm (5.6mil) 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 G52355-0, Rev 2.0 02/09/01 VITESSE SEMICONDUCTOR CORPORATION Advance Product Information 3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect VSC7969 Table 3: Pad Coordinates Signal Name Pad Number Coordinates (µm) Description X Y GND 1 130 250 Negative power supply rail (typically 0V) BG_VREF 2 130 375 Band Gap voltage reference 1.24V for testpoint, no connect GND 3 130 500 Negative power supply rail (typically 0V) SD_TP 4 130 625 Signal Detect test point, DO NOT CONNECT. SD_ADJ 5 130 750 Signal Detect threshold adjustment (see Application amd Usage section) VOUTN 6 137 875 Complementary logic output (logic LOW when photocurrent is HIGH) SD_OUT 7 280 875 Signal detect output (logic HIGH when photocurrent exceeds SDA) GND 8 405 875 Negative power supply rail (typically 0V) VOUTN 9 530 875 Complementary logic output (logic LOW when photocurrent is HIGH) GND 10 655 875 Negative power supply rail (typically 0V) VOUTP 11 780 875 Positive logic output (logic HIGH when photocurrent is HIGH) GND 12 905 875 Negative power supply rail (typically 0V) IMON 13 1030 875 Photocurrent Monitor VOUTP 14 1173 875 Positive logic output (logic HIGH when photocurrent is HIGH) GMD 15 1180 750 Negative power supply rail (typically 0V) CSDN 16 1180 625 Test point for Signal Detect capacitor. DO NOT CONNECT. CSDP 17 1180 500 Test point for Signal Detect capacitor. DO NOT CONNECT. GND 18 1180 375 Negative power supply rail (typically 0V) GND 19 1180 250 Negative power supply rail (typically 0V) GND 20 1030 125 Negative power supply rail (typically 0V) GND 21 905 125 Negative power supply rail (typically 0V) FILTER 22 780 125 Photodetector cathode connection (filtered VCC) IN 23 530 125 Photodetector anode connection GND 24 405 125 Negative power supply rail (typically 0V) VCCS 25 280 125 Positive power supply rail for 3.3V operation VCCD 26 137 125 Positive power supply rail for 5V operation G52355-0, Rev 2.0 02/09/01 © 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 Advance Product Information 3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect VSC7969 Package Pin Descriptions Figure 2: Pin Diagram VCC 1 16 SD_ADJ GND 2 15 SD_OUT GND 3 14 GND IN 4 13 VOUTN VSC7969 FILTER 5 12 VOUTP GND 6 11 GND GND 7 10 GND GND 8 9 IMON Table 4: Pin Identifications Pin Name Pin No. Description VCC 1 Power Supply GND 2 Ground GND 3 Ground IN 4 Photodetector Anode Connection FILTER 5 Photodetector Cathode Connection (filtered VCC) GND 6 Ground GND 7 Ground GND 8 Ground IMON 9 Photocurrent Monitor GND 10 Ground GND 11 Ground VOUTP 12 Positive Logic Output (logic HIGH when photocurrent is HIGH) VOUTN 13 Complementary Logic Output (logic LOW when photocurrent is HIGH) GND 14 Ground SD_OUT 15 Signal Detect Output (logic HIGH when photocurrent exceeds SDA) SD_ADJ 16 Signal Detect Threshold Adjustment (see Applications and Usage section) 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 G52355-0, Rev 2.0 02/09/01 VITESSE SEMICONDUCTOR CORPORATION Advance Product Information 3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect VSC7969 Typical Operating Characteristics Electrical Eye Diagram, Electrical Eye Diagram, 31 Input = 8µAp-p, 3.125Gb/s, PRBS 2 -1 TA = º+25C, VCC = 3.3V Input = 100µAp-p, 3.125Gb/s, PRBS 231-1 TA = º+25C, VCC = 3.3V Bit Error Rate vs Input Level IMON Characteristic, 0µA to 200µA Input IMON CHARACTERISTIC 0µA to 200µA Input BIT ERROR RATE vs INPUT LEVEL 1.00E-07 250 200 1.00E-09 IMON (µA) Bitt Eorr Rate (BER) 1.00E-08 1.00E-10 150 100 1.00E-11 50 1.00E-12 1.00E-13 6.0 6.5 7.0 7.5 IN (IPD) (µAp-p) G52355-0, Rev 2.0 02/09/01 8.0 8.5 0 0 50 100 150 200 IN (DC Current) (µA) © 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 3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect Advance Product Information VSC7969 Circuit Description The VSC7969 data path consists of several stages: transimpedance input stage, limiting amplifier, and output driver. The transimpedance amplifier accepts current from a photodetector connected to the input pad ‘IN’ and converts the input current to a differential output voltage. The signal then travels to the second stage limiting amplifier which provides DC restoration, eliminating the DC component of the input signal. The linear photocurrent monitor and signal detect function is also provided by this stage. The final stage consists of an output driver with a differential pair connected to VCC via 50Ω internal pull-up resistors. The overall effective differential transimpedance of the VSC7969 is typically 27kΩ. The limited output single-ended voltage swing is typically 250mVp-p. Design Guidelines Power Supply The VSC7969 is supplied by a single supply voltage; for +3.3V operation, the supply votlage should be applied to only VCCS. For +5V operation, the supply voltage should be applied to only VCCD. Data Outputs The outputs of the VSC7969 need to be AC-coupled. This capacitor will determine the low frequency cutoff for the system, which is directly related to the receiver’s deterministic jitter. For ATM/SONET or other applications using PRBS NRZ data, select a capacitor of at least 0.1µF or greater, which provides less than 32kHz low frequency cutoff. For Fibre Channel, Gigabit Ethernet, or other applications requiring 8B/10B data coding, select a capacitor of at least 0.01µF or greater, which provides less than 320kHz low frequency cutoff. The outputs can be used single-ended or differential. For best performance, differential operation is recommended. If single-ended operation is necessary, the unused output should be AC-coupled and terminated with an impedance equal to the load on the pin in use. 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 G52355-0, Rev 2.0 02/09/01 VITESSE SEMICONDUCTOR CORPORATION Advance Product Information 3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect VSC7969 Signal Detect The signal detect feature of the VSC7969 provides a CMOS level output corresponding to the input current level to the transimpedance amplifier. The assert and deassert levels of the signal detect pin can be adjusted by placing an optional resistor from SD_ADJ to ground. The following tables show the two extremes at which the signal detect pin will operate; open circuit and short-ciruit to ground. Table 5: Signal Detect Function, SD_ADJ Open Electrical Min Typ Max Units Assert 3 5 9 µA Deassert Hysteresis 1 1 2.2 2 3 4 µA dB With SD_ADJ (pin 16) shorted to ground, thresholds are 3dB higher, as shown in Table 6. Table 6: Signal Detect Function, SD_ADJ Shorted to Ground Electrical Min Typ Max Units Assert Deassert 6 2 10 4.4 18 6 µA µA Hysteresis 1 2 4 dB Photodetector Current Monitor The IMON pin provides a linear measurement of the average input current from the photodetector to the transimpedance amplifier. For example, if 20µA is the average input current to the transimpedance amplifier, the current through the IMON pin will be 20µA (see the typical operating curve “IMON Characteristic, 0µA to 200µA). To use this feature, connect the IMON pin to VCC using a resistor less than 2kΩ. If this feature is not used, the IMON pin can be left unconnected. G52355-0, Rev 2.0 02/09/01 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: [email protected] Internet: www.vitesse.com Page 9 VITESSE SEMICONDUCTOR CORPORATION Advance Product Information 3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect VSC7969 Application Information VCC IMON VOUTP GND NOTES: No external components required. Unused output is AC-coupled and terminated to 50Ω. Page 10 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: [email protected] Internet: www.vitesse.com G52355-0, Rev 2.0 02/09/01 VITESSE SEMICONDUCTOR CORPORATION Advance Product Information VSC7969 3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect Package Information TSSOP-16 1. All dimensioning and tolerancing per ASME. Y14.5-1994 2. Controlling dimension: millimeter 3. This outline conforms to JEDEC Publication 95 Registration MS-026 G52355-0, Rev 2.0 02/09/01 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: [email protected] Internet: www.vitesse.com Page 11 VITESSE SEMICONDUCTOR CORPORATION Advance Product Information 3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect VSC7969 TO-46 Ball Lens Package TOP VIEW SIDE VIEW 1. Controlling dimenstion: millimeter Reference Isometric Page 12 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: [email protected] Internet: www.vitesse.com G52355-0, Rev 2.0 02/09/01 VITESSE SEMICONDUCTOR CORPORATION Advance Product Information VSC7969 3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect TO-46 Flat Window Package TOP VIEW Reference Isometric 1. Controlling dimension: millimeter G52355-0, Rev 2.0 02/09/01 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: [email protected] Internet: www.vitesse.com Page 13 VITESSE SEMICONDUCTOR CORPORATION 3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect Advance Product Information VSC7969 Ordering Information The order number for this product is formed by a combination of the device type and package type. VSC7969 xx Device Type 3.125Gb/s Integrated Transimpedance and Limiting Amplfier with Signal Detect Package YD1: TSSOP-16, 3.3V Supply YD2: TSSOP-16, 5V Supply W: Dice Waffle Pack WD1A: TO-46 Ball Lens, 3.3V Supply, VOUTN/VOUTP Outputs WD1B: TO-46 Ball Lens, 3.3V Supply, VOUTN/IMON Outputs WD2A: TO-46 Ball Lens, 5V Supply, VOUTN/VOUTP Outputs WD2B: TO-46 Ball Lens, 5V Supply, VOUTN/IMON Outputs 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 14 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: [email protected] Internet: www.vitesse.com G52355-0, Rev 2.0 02/09/01