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TL052AIDG4 Fiches technique(PDF) 44 Page - Texas Instruments |
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TL052AIDG4 Fiches technique(HTML) 44 Page - Texas Instruments |
44 / 67 page TL05x, TL05xA ENHANCED-JFET LOW-OFFSET OPERATIONAL AMPLIFIERS SLOS178A – FEBRUARY 1997 - REVISED FEBRUARY 2003 44 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION high input impedance log amplifier The low input offset voltage and high input impedance of the TL05xA creates a precision log amplifier (see Figure 87). IC1 is a 2.5-V, low-current precision, shunt regulator. Transistors Q1 and Q2 must be a closely matched npn pair. For best performance over temperature, R4 should be a metal-film resistor with a low temperature coefficient. In this circuit, U1A serves as a high-impedance unity-gain buffer. Amplifier U1B converts the input voltage to a current through R1 and Q1. Amplifier U1C, IC1, and R4 form a 1- µA temperature-stable current source that sets the base-emitter voltage of Q2. U1D amplifies the difference between the base-emitter voltage of Q1 and Q2 (see Figure 88). The output voltage is given by the following equation: V O + – 1 ) R6 R5 kT q In V I R1 1 10–6 where k + 1.38 10–23,q + 1.602 10–19, and T is Kelvin temperature _ + _ + U1A _ + U1B _ + U1C U1D VI R1 10 k Ω Q1 Q2 2N2484 R2 15 V 10 k Ω 2.5 M Ω R4 150 pF C1 IC1 270 k Ω R3 –15V R5 10 k Ω R6 10 k Ω VO (see equation above) NOTE A: U1A through U1D = TL05xA. IC1 = LM385, LT1004, or LT1009 voltage reference Figure 87. Log Amplifier 0 1 2345 6 f – Frequency – Hz 78 9 10 –0.4 –0.35 –0.3 –0.25 –0.2 –0.15 –0.1 Figure 88. Output Voltage vs Input Voltage for Log Amplifier |
Numéro de pièce similaire - TL052AIDG4 |
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Description similaire - TL052AIDG4 |
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