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LOG2112 Datasheet(PDF) 5 Page - Texas Instruments |
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LOG2112 Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 14 page  LOG112, 2112 5 SBOS246C www.ti.com TYPICAL CHARACTERISTICS At TA = +25°C, VS = ±5V, and RL = 10kΩ, unless otherwise noted. 2.0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 NORMALIZED TRANSFER FUNCTION 0.0001 0.001 0.01 0.1 1 10 100 1k 10k Current Ratio, I 1/I2 V LOGOUT = (0.5V)LOG (I1/I2) ONE CYCLE OF NORMALIZED TRANSFER FUNCTION 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 110 Current Ratio, I 1/I2 8 7 6 5 4 3 2 1 0 –1 –2 1nA 10nA 100nA 1 µA10µA 100µA 1mA 10mA 100pA GAIN ERROR (I 2 = 1µA) Input Current (I 1 or I2) –40 °C +75 °C –5 °C +25°C +85 °C –20 –15 –10 –5 0 5 10 15 20 –20 –15 –10 –5 0 5 10 15 20 I 1 I 2 TOTAL ERROR (–5 °C) 10 to 15 5 to 10 0 to 5 –5 to 0 –20 –15 –10 –5 0 5 10 15 20 –20 –15 –10 –5 0 5 10 15 20 I 1 I 2 5 to 10 0 to 5 –5 to 0 TOTAL ERROR (25 °C) –20 20 0 40 60 80 100 –20 0 20 40 60 80 100 I 1 I 2 20 to 40 0 to 20 40 to 60 60 to 80 80 to 100 –20 to 0 TOTAL ERROR (70 °C) |
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