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LM4610N bảng dữ liệu(PDF) 4 Page - National Semiconductor (TI) |
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LM4610N bảng dữ liệu(HTML) 4 Page - National Semiconductor (TI) |
4 / 11 page Typical Performance Characteristics (Continued) Application Notes TONE RESPONSE The maximum boost and cut can be optimized for individual applications by selection of the appropriate values of C t (treble) and C b (bass). The tone responses are defined by the relationships: Where a b=at=0 for maximum bass and treble boost respec- tively and a b=at=1 for maximum cut. For the values of C b and Ct of 0.39 µF and 0.01 µF as shown in the Application Circuit, 15 dB of boost or cut is obtained at 40 Hz and 16 kHz. NATIONAL 3D-SOUND When stereo speakers need to be closer than optimum be- cause of equipment /cabinet limitations, an improved stereo effect can be obtained using a modest amount of phase - re- versed interchannel cross-coupling. In the LM4610 the input stage tramsistor emitters are brought out to facillitate this. The arrangement is shown below in the basic form. With a monophonic source, the emitters have the same sig- nal and the resistor and capacitor connected between them have no effect. With a stereo signal each transistor works in the grounded base mode for stereo components, generating an in-phase signal from the opposite channel. As the normal signals are inverted at this point, the appropriate phase-reversed cross-coupling is achieved. An effective level of coupling of 60% can be obtained using 4.7k in con- junction with the internal 6.5k emitter resistors. At low fre- quencies, speakers become less directional and it becomes desirable to reduce the enhancement effect. With a 0.1µF coupling capacitor, as shown, roll-off occurs below 330 Hz. The coupling components may be varied for alternative re- sponses. ZENER VOLTAGE A zener voltage (pin 19=5.4V) is provided which may be used to bias the control potentiometers. Setting a DC level of one half of the zener voltage on the control inputs, pins 6,11, and 16, results in the balanced gain and flat response condi- tion. Typical spread on the zener voltage is ±100 mV and this must be taken into account if control signals are used which are not referenced to the zener voltage. If this is the case, then they will need to be derived with similar accuracy. LOUDNESS COMPENSATION A simple loudness compensation may be effected by apply- ing a DC control voltage to pin 9. This operates on the tone control stages to produce an additional boost limited by the maximum boost defined by C b and Ct. There is no loudness compensation when pin 9 is connected to pin 19. Pin 9 can be connected to pin 14 to give the loudness compensated volume characteristic as illustrated without the addition of further external components. (Tone settings are for flat re- sponse, C b and Ct as given in Application Circuit.) Modifica- tion to the loudness characteristic is possible by changing the capacitors C b and Ct for a different basic response or, by a resistor network between pins 9 and 14 for a different threshold and slope. SIGNAL HANDLING The volume control function of the LM4610 is carried out in two stages, controlled by the DC voltage on pin 14, to im- prove signal handling capability and provide a reduction of output noise level at reduced gain. The first stage is before the tone control processing and provides an initial 15 dB of gain reduction, so ensuring that the tone sections are not overdriven by large input levels when operating with a low volume setting. Any combination of tone and volume settings Loudness Control Characteristic DS101125-29 Output Noise Voltage vs Gain DS101125-30 THD vs Input Voltage DS101125-31 DS101125-34 www.national.com 4 |
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