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LOG102 Scheda tecnica(PDF) 10 Page - Texas Instruments |
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LOG102 Scheda tecnica(HTML) 10 Page - Texas Instruments |
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10 / 13 page ![]() www.ti.com LOG102 10 SBOS211A FIGURE 12. Technique for Using Full-Scale Reference Current Such that VOUT Increases with Increasing Photodiode Current. A 1 A 2 LOG102 Q 1 Q 2 A 3 R 2 R 3 R 2 5 10 3 7 4 R 3 C C V LOGOUT V REF I REF I REF = I MIN to IMAX V REF R 1 V OUT = VREF – • LOG ( ) R 2 R 3 I REF I PHOTO I 1 I 2 14 1 I PHOTO A/D R 1 V MIN to VMAX FIGURE 13. High Side Shunt for Avalanche Photodiode (APD) Measures 3-Decades of APD Current. A 1 –5V SO-14 9 LOG102 Q 1 2 Q 2 I OUT I OUT = 0.1 • ISHUNT 10 1.2k Ω Receiver Irx = 1 µA to 1mA I to V Converter APD 10gbits/sec 1k Ω C C A 2 A 3 V OUT = 2.5V to 0V I SHUNT 100 µA 500 5k Ω 5k Ω +15V to +60V +5V 25k Ω NOTE: (1) Available Q2 2002. INA168 SOT23-5 REF3025(1) 2.5V +5V 1 1 14 6 54 7 3 |
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