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ADN2820S21 Datasheet(PDF) 8 Page - Analog Devices |
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ADN2820S21 Datasheet(HTML) 8 Page - Analog Devices |
8 / 12 page ADN2820 Rev. 0 | Page 8 of 12 APPLICATIONS OPTICAL SENSITIVITY ) 1 ( 2 ) / 1000 ( ) 1 ( ) / ( log 10 ) ( 10 − ρ × + × + α × = ER W mW ER Z V I dBm y Sensitivit T S RMS where: ρ = photodiode responsivity (A/W), 0.85 A/W typical IRMS = TIA input referred noise (A), typically 1.05 µA for the ADN2820 α = BER factor, α = 14.1 for 10–12 BER ER = extinction ratio, 8 dB typical VS = PA/CDR input sensitivity (V), 5 mV to 100 mV ZT = TIA transimpedance (V/A), 5 kΩ for ADN2820 Table 5. Optical Sensitivity Transimpedance (ZT) Optical Input Sensitivity (dBm) 2 kΩ 5 kΩ Infinite 100 mV –13.1 –15.7 –19.3 50 mV –15.1 –17.1 –19.3 25 mV –16.7 –18.1 –19.3 10 mV –18.1 –18.8 –19.3 PA/CDR Input Sensitivity (VS) 5 mV –18.7 –19.0 –19.3 OPTICAL POWER MONITOR Average optical power monitor (OPM) measurement is a recommended diagnostic feature in module multisource specification agreements (MSAs) such as the 300-pin 10 Gb transponder (MSA300) and 10 Gb form factor pluggable module (XFP) specifications. The ADN2820 enables the simple calculation of OPM using the POWMON output, which is linearly proportional to the average input current. When monitoring the POWMON output, connect to a high impedance input; typical POWMON output impedance is 1 kΩ. To disable the POWMON feature, leave the pad floating (not bonded). Assuming linear diode responsivity ρ, average input current is linearly proportional to average input power: IIN,AVE (A) = ρ (A/W) × PIN,AVE (W) Ideally, POWMON (V) = ρ (A/W) × PIN,AVE (W) × POWMONGAIN (V/A) + POWMONOFFSET (V) From a POWMON measurement, the average input power can be estimated by calculating the optical power monitor (OPM): OPM (W) = (POWMON (V) – POWMONOFFSET (V))/(ρ (A/W) × POWMONGAIN (V/A)) OPM calculation from typical ADN2820 POWMON versus IIN,AVE measurement data: (POWMONOFFSET = 20 mV, POWMONGAIN = 1 V/mA, ρ =1 A/W) –30 –25 –20 –15 –10 –5 0 –20 –15 –30 –25 –10 –5 0 AVERAGE INPUT POWER (dBm) Figure 13. POWMON Transfer Function –1.0 –0.6 –0.2 0.2 0.6 1.0 –20 –15 –30 –25 –10 –5 0 AVERAGE INPUT POWER (dBm) Figure 14. POWMON Accuracy |
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