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LM4894MM Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM4894MM Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 19 page Typical Performance Characteristics Non-LD Specific Characteristics (Continued) PSRR vs DC Common-Mode Voltage PSRR vs DC Common-Mode Voltage 20013780 20013781 THD vs Common-Mode Voltage THD vs Common-Mode Voltage 20013782 20013783 Application Information DIFFERENTIAL AMPLIFIER EXPLANATION The LM4894 is a fully differential audio amplifier that fea- tures 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 V DD/2. When setting the differential gain, the amplifier can be considered to have "halves". Each half uses an input and feedback resistor (R i1and RF1) to set its respective closed-loop gain (see Figure 1). With R i1 =Ri2 and RF1 =RF2, the gain is set at -R F/Ri for each half. This results in a differential gain of A VD =-RF/Ri (1) It is extremely important to match the input resistors to each other, as well as the feedback resistors to each other for best amplifier performance. See the Proper Selection of Exter- nal Components section for more information. A differential amplifier works in a manner where the difference between the two input signals is amplified. In most applications, this would require input signals that are 180˚ out of phase with each other. The LM4894 can be used, however, as a single ended input amplifier while still retaining its fully differential benefits. In fact, completely unrelated signals may be placed on the input pins. The LM4894 simply amplifies the differ- ence between them. Figures 2 and 3 show single-ended applications of the LM4894 that still take advantage of the differential nature of the amplifier and the benefits to PSRR, common-mode noise reduction, and "click and pop" reduc- tion. All of these applications, either single-ended or fully differ- ential, provide what is known as a "bridged mode" output (bridge-tied-load, BTL). This results in output signals at V o1 and V o2 that are 180˚ out of phase with respect to each www.national.com 11 |
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