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ED300-2 Datasheet(PDF) 10 Page - Texas Instruments |
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ED300-2 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 21 page + VIN I I 2 1 V = LOGOUT 0.375 LOG 10 · + 2 V + I 50 1 W · ( ( I I 2 1 V = [ LOG 0.375 LOG 10 · + I 50 ] 1 W · · 0.3 V/V + 2 V ( ( (I 3) 1 k 1 W · 2 21.5 kW + 5 kW · V = 2 + ERR V = 2 V V OUT LOG ERR - · Connecting to the LOG114EVM www.ti.com In the case where I 1 = 500 nA = IREF, the VLOGOUT terminal is equal to the level shifting bias voltage of 2 V and the V OUT terminal is equal to 1.5 V. The circuit in Figure 10, while convenient for creating an input current, does not take advantage of the high-current linearity correction circuitry. To use this circuitry, a second power supply must be used and configured as shown in Figure 11. Figure 11. Using a Resistor and the High Current Linearity Correction Circuitry Changing the input voltage or the resistor value changes the input current I 1 (I1 = VIN/R) and results in a change for the V LOGOUT terminal voltage according to Equation 5. (5) For input currents less than 1 mA, this equation simplifies to Equation 2. The voltage at the V LOG terminal is given by Equation 6: (6) The voltage at the V ERR terminal is given by Equation 7: (7) The voltage at the V OUT terminal is given by Equation 8: (8) 10 LOG114EVM User Guide SBOU110 – September 2011 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated |
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