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VITESSE
SEMICONDUCTOR CORPORATION
Advance Product Information
VSC7969
Features
• 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
3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect
Applications
• 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 +3.3V VCCD GND Dual power supply pins are provided for +5V or +3.3V operation. Only one power supply pin should be connected.
50Ω In
50Ω VOUTP VOUTN Signal Detect
Outputs need to be AC-coupled
0.1µF 0.1µF
SD_OUT SD_ADJ
VSC7969
Monitor
IMON
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 1
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VITESSE
SEMICONDUCTOR CORPORATION
3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect
Advance Product Information
VSC7969
Electrical Characteristics
Table 1: AC Specifications Symbol
∆IPH IPHS-AVG
Parameter
Input Photocurrent Swing
Min
Typ
Max
2.2
Units
mA
Conditions
Peak-to-peak AC current amplitude -23dBm average optical power with a detector responsitivity of 0.8A/W. -23dBm average optical power with a detector responsitivity of 0.8A/W. Single-ended peak-to-peak measurement, IIN >20µA. Differential peak-to-peak measurement, IIN >20µA. At 2.2mAp-p input photocurrent swing. 20% to 80%. Differential measurement Modulation frequency between FL and BW Referenced to 10MHz, CPD = 0.6pF Referenced to 10MHz, CPD = 0.6pF with no external components Single-ended 30kHz to 2.5GHz Bias voltage on detector at 2.0V Electrical measurement on SD pin Average photocurrent with SD open. Average photocurrent with SD open. Average photocurrent with SD shorted to ground. Average photocurrent with SD shorted to ground.
Average Photocurrent Sensitivity
4
µA
IPHS-PEAK ∆VOUT-SE ∆VOUT-DIFF tR, tF ZT(1) ∆ZT(1) BW
Peak Input Photocurrent Sensitivity Single-Ended Output Voltage Amplitude Differential Output Voltage Amplitude Rise and Fall Time Transimpedance Gain Ripple in Passband Transimpedance Upper -3dB Bandwidth 2.2 20k
8
µA
200 400
250 500 60 27k 1 2.5
300 600 100 40k
mV mV ps Ω dB
3.0
GHz
FL ZO PSRR INOISE CPD SDH SDA-OPEN SDD-OPEN SDA-SHORT SDD-SHORT SDHIGH SDLOW
Lower -3dB Cutoff Frequency Output Impedance Power Supply Rejection Ratio Input-Referred rms Noise Current Photodetector Capacitance Signal Detect Hysterisis Signal Detect Assertion Level Signal Detect Deasseration Level Signal Detect Asseration Level Signal Detect Deasseration Level Signal Detect HIGH Logic Level Signal Detect LOW Logic Level 0.4 1 3 1.0 6 2.0 50 TBD 500 0.6 2 5 2.2 10 4.4 VCCS - 0.3 0.5
100
kHz Ω nA
0.8 4 9 3.0 18 6.0
pF dB µA µA µA µA V
0.8
V
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
G52355-0, Rev 2.0 02/09/01
www.DataSheet4U.com
VITESSE
SEMICONDUCTOR CORPORATION
Advance Product Information
VSC7969
Symbol
MON DC IMONRANGE RJ DJ
3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect
Min Typ
0.8 -5 5 0 TBD TBD +5 200 10
Parameter
Slope of Linear Analog Photocurrent Monitor vs Input Optical Power Duty Cycle Photocurrent Monitor Linearity Range Random Jitter
(2) (3)
Max
Units
µA/µW % µA µA ps ps
Conditions
0Ω to 2kΩ to VCC with a detector re.