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LM4610 Datasheet(PDF) 9 Page - Texas Instruments |
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LM4610 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 18 page OBSOLETE LM4610 www.ti.com SNOS474C – MAY 1999 – REVISED APRIL 2013 Figure 17. Tone Characteristic (Gain vs Frequency) Figure 18 shows the effect of changing Ct and Cb in the opposite direction to Ct/2, 2Cb respectively giving reduced control ranges. The various results corresponding to the different Ct and Cb values may be mixed if it is required to give a particular emphasis to, for example, the bass control. The particular case with Cb/2, Ct is illustrated in Figure 19. RESTRICTION OF TONE CONTROL ACTION AT HIGH OR LOW FREQUENCIES It may be desired in some applications to level off the tone responses above or below certain frequencies for example to reduce high frequence noise. This may be achieved for the treble response by including a resistor in series with Ct. The treble boost and cut will be 3 dB less than the standard circuit when R=XC. A similar effect may be obtained for the bass response by reducing the value of the AC bypass capacitors on pins 7 (channel 1) and 18 (channel 2). The internal resistance at these pins is 1.3 k Ω and the bass boost/cut will be approximately 3 dB less with XC at this value. An example of such modified response curves is shown in Figure 20. The input coupling capacitors may also modify the low frequency response. It will be seen from Figure 16 and Figure 17 that modifying Ct and Cb for greater control range also has the effect of flattening the tone control extremes and this may be utilized, with or without additional modification as outlined above, for the most suitable tone control range and response shape. OTHER ADVANTAGES OF DC CONTROLS The DC controls make the addition of other features easy to arrange. For example, the negative-going peaks of the output amplifiers may be detected below a certain level, and used to bias back the bass control from a high boost condition, to prevent overloading the speaker with low frequency components. LOUDNESS CONTROL The loudness control is achieved through control of the tone sections by the voltage applied to pin 9; therefore, the tone and loudness functions are not independent. There is normally 1 dB more bass than treble boost (40 Hz–16 kHz) with loudness control in the standard circuit. If a greater difference is desired, it is necessary to introduce an offset by means of Ct or Cb or by changing the nominal control voltage ranges. Figure 21 shows the typical loudness curves obtained in the standard application circuit at various volume levels (Cb=0.39 μF). Copyright © 1999–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM4610 |
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