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LM4941TMBD Scheda tecnica(PDF) 10 Page - Texas Instruments |
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LM4941TMBD Scheda tecnica(HTML) 10 Page - Texas Instruments |
10 / 23 page 0 90 180 0 0.1 0.2 0.3 0.4 0.6 0.7 AMBIENT TEMPRATURE ( oC) 120 150 0.5 TM LLP Note 11 30 60 0 20 40 60 LOAD RESISTANCE (:) 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 10 30 50 70 3 0 0.4 1.4 1.6 1.8 SUPPLY VOLTAGE (V) 4.5 1.5 2 1.5 3.5 5 4 0.2 0.6 0.8 1 1.2 5.5 1 LM4941, LM4941SDBD, LM4941TMBD SNAS347B – JUNE 2006 – REVISED MARCH 2007 www.ti.com Typical Performance Characteristics (1) (continued) Output Power vs Load Resistance IDDQ Top-VDD = 5V, 10% THD+N, Topmid-VDD = 5V, 1% THD+N vs Bot-VDD = 3V, 10% THD+N, Botmid-VDD = 3V, 1% THD+N Supply Voltage Power Derating Curve fIN = 1kHz, RL = 8Ω Application Information OPTIMIZING RF IMMUNITY The internal circuitry of the LM4941 suppresses the amount of RF signal that is coupled into the chip. However, certain external factors, such as output trace length, output trace orientation, distance between the chip and the antenna, antenna strength, speaker type, and type of RF signal, may affect the RF immunity of the LM4941. In general, the RF immunity of the LM4941 is application specific. Nevertheless, optimal RF immunity can be achieved by using short output traces and increasing the distance between the LM4941 and the antenna. DIFFERENTIAL AMPLIFIER EXPLANATION The LM4941 is a fully differential audio amplifier that features differential input and output stages. Internally this is accomplished by two circuits: a differential amplifier and a common mode feedback amplifier that adjusts the output voltages so that the average value remains VDD / 2. When setting the differential gain, the amplifier can be considered to have "halves". Each half uses an input and feedback resistor (Ri and RF) to set its respective closed-loop gain (see Figure 1). With Ri1 = Ri2 and RF1 = RF2, the gain is set at -RF / Ri for each half. This results in a differential gain of 10 Submit Documentation Feedback Copyright © 2006–2007, Texas Instruments Incorporated Product Folder Links: LM4941 LM4941SDBD LM4941TMBD |
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