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AD8015ACHIPS Datasheet(PDF) 6 Page - Analog Devices |
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AD8015ACHIPS Datasheet(HTML) 6 Page - Analog Devices |
6 / 8 page REV. A –6– AD8015 100 50 1 10 100 1000 FREQUENCY – MHz 0 5V, +25 °C PIN 7 PIN 6 Figure 12. Output Impedance vs. Frequency 100 –100 20 0 0 10 TIME – ns Figure 13. Small Signal Pulse Response 2 0 –12 10.0E+6 100.0E+6 1.0E+9 –2 –4 –6 –8 –10 0pF 1pF 3pF 5pF 8pF FREQUENCY – Hz Figure 14. Differential Gain vs. Input Capacitance APPLICATION 155 Mbps Fiber Optic Receiver The AD8015 and AD807 can be used together for a complete 155 Mbps Fiber Optic Receiver (Transimpedance Amplifier, Post Amplifier with Signal Detect Output, and Clock Recovery and Data Retiming) as shown in Figure 16. The PIN diode front end is connected to a single mode, 1300 nm laser source. The PIN diode has 3.3 V reverse bias, 0.8 A/W responsivity, 0.7 pF capacitance, and 2.5 GHz bandwidth. The AD8015 outputs (POUT and NOUT) drive a differential, con- stant impedance (50 Ω) low-pass π filter with a 3 dB cutoff of 100 MHz. The outputs of the low-pass filter are ac coupled to the AD807 inputs (PIN and NIN). The AD807 PLL damping factor is set at 10 using a 0.22 µF capacitor. The entire circuit was enclosed in a shielded box. Table I sum- marizes results of tests performed using a 2 23–1 PRN sequence, and varying the average power at the PIN diode. The circuit acquires and maintains lock with an average input power as low as –39.25 dBm. 80 0 20 10 40 30 50 60 70 80 0 20 10 40 30 50 60 70 90 100 30 DEVICES, 2 LOTS: (+OUT, –OUT) × (25°C, –40°C, 85°C) × (5V, 4.5V, 11.0V) FREQUENCY – Hz Figure 15. Bandwidth Distribution Matrix |
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