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ONET8511TY Datasheet(PDF) 10 Page - Texas Instruments |
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ONET8511TY Datasheet(HTML) 10 Page - Texas Instruments |
10 / 14 page www.ti.com APPLICATION INFORMATION 0.1 F m 0.1 F m RSSI OUT– OUT+ VCC_IN GND VCC_OUT 220 W R RSSI 3 1 4 5 6 7 8 9 10 11 12 18 17 16 15 14 13 2 S0332-01 8511T ASSEMBLY RECOMMENDATIONS ONET8511T SLLS895 – MARCH 2008 Figure 15 shows the ONET8511T being used in a typical fiber optic receiver circuit using the internal photodiode bias. The ONET8511T converts the electrical current generated by the PIN photodiode into a differential output voltage. The FILTER inputs provide a DC bias voltage for the PIN that is low pass filtered by the combination of an internal 220 Ω resistor and a capacitor. Because the voltage drop across the 220 Ω resistor is sensed and used by the bias circuit, the photodiode must be connected to the FILTER pads for the AGC to function correctly. The RSSI output is used to mirror the photodiode output current and must be connected using a resistor to GND. The voltage gain can be adjusted for the intended application by choosing the external resistor; however, for proper operation of the ONET8511T, ensure that the voltage at RSSI never exceeds VCC–0.65 V. The RSSI output must be grounded if it is unused. The OUT+ and OUT– pins are internally terminated by 50 Ω pull-up resisters to VCC. The outputs must be AC coupled, for example by using 0.1 µF capacitors, to the succeeding device. Figure 15. Basic Application Circuit You need to concentrate on assembly parasitics and external components to achieve optimal performance. Recommendations that optimize performance include: 1. Minimize the total capacitance on the IN pad by using a low capacitance photodiode and compensating for stray capacitances. Place the photodiode close to the ONET8511T die in order to minimize the bond wire length and associated parasitic inductance. 2. Use identical termination and symmetrical transmission lines at the AC coupled differential output pins OUT+ and OUT–. 3. Use short bond wire connections for the supply terminals VCC_IN, VCC_OUT and GND. Supply voltage filtering is provided on chip but filtering may be improved by using an additional external capacitor. 10 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): ONET8511T |
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