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LOG112AIDE4 Datasheet(PDF) 10 Page - Texas Instruments |
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LOG112AIDE4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 20 page LOG112, 2112 10 SBOS246D www.ti.com FIGURE 11. Single +5V Power-Supply Operation. 14 1 5 10 6 9 1 2 35 4 –5V 1 µF LOG112 1 µF I 1 I 2 V LOGOUT C C 1 µF TPS(1) Single Supply +5V NOTE: (1) TPS60402DBV negative charge pump. FIGURE 10. Absorbance Measurement. I 2 I 1 14 1 9 10 5 V LOGOUT 6 V+ V– C C LOG112 D 2 D 1 Sample λ 1 λ 1´ λ 1 Light Source DATA COMPRESSION In many applications, the compressive effects of the logarith- mic transfer function are useful. For example, a LOG112 preceding a 12-bit A/D converter can produce the dynamic range equivalent to a 20-bit converter. OPERATION ON SINGLE SUPPLY Many applications do not have the dual supplies required to operate the LOG112 and LOG2112. Figure 11 shows the LOG112 and LOG2112 configured for operation with a single +5V supply. MEASURING AVALANCHE PHOTODIODE CURRENT The wide dynamic range of the LOG112 and LOG2112 is useful for measuring avalanche photodiode current (APD), as shown in Figure 12. FIGURE 12. High-Side Shunt for APD Measures 3 Decades of APD Current. A 1 –5V SO-14 911 13 LOG112 Q 1 2 Q 2 I OUT I OUT = 0.1 • ISHUNT 10 3 4 10k Ω Receiver Irx = 1 µA to 1mA I-to-V Converter APD 10Gbits/sec 16.7k Ω C C A 2 A 3 V 03 = 2.5V to 0V I SHUNT 500 Ω 5k Ω 5k Ω +15V to +60V +5V INA168 SOT23-5 +5V 1 1 14 8 6 5 7 100 µA 25k Ω V REF |
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