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LM1036N データシート(PDF) 4 Page - National Semiconductor (TI) |
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LM1036N データシート(HTML) 4 Page - National Semiconductor (TI) |
4 / 10 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. ZENER VOLTAGE A zener voltage (pin 17=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 4, 9, and 14, 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 7. 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 7 is connected to pin 17. Pin 7 can be connected to pin 12 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 7 and 12 for a different threshold and slope. SIGNAL HANDLING The volume control function of the LM1036 is carried out in two stages, controlled by the DC voltage on pin 12, 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 may be used provided the output level does not exceed 1 Vrms, V CC=12V (0.8 Vrms, VCC=9V). At reduced gain (<−6 dB)the input stage will overload if the input level ex- ceeds 1.6 Vrms, V CC=12V (1.1 Vrms, VCC=9V). As there is volume control on the input stages, the inputs may be oper- ated with a lower overload margin than would otherwise be acceptable, allowing a possible improvement in signal to noise ratio. Loudness Control Characteristic DS005142-29 Output Noise Voltage vs Gain DS005142-30 THD vs Input Voltage DS005142-31 www.national.com 4 |
同様の部品番号 - LM1036N |
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同様の説明 - LM1036N |
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