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LM1036 Datasheet(PDF) 6 Page - Texas Instruments |
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LM1036 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 23 page LM1036 SNAS525C – JAN 1995 – REVISED APRIL 2013 www.ti.com Application Notes TONE RESPONSE The maximum boost and cut can be optimized for individual applications by selection of the appropriate values of Ct (treble) and Cb (bass). The tone responses are defined by the relationships: where • ab=at=0 for maximum bass and treble boost respectively • ab=at=1 for maximum cut (1) For the values of Cb 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 condition. 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 applying 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 Cb 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 response, Cb and Ct as given in Application Circuit.) Modification to the loudness characteristic is possible by changing the capacitors Cb 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 improve 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, VCC=12V (0.8 Vrms, VCC=9V). At reduced gain (<−6 dB) the input stage will overload if the input level exceeds 1.6 Vrms, VCC=12V(1.1 Vrms, VCC=9V). As there is volume control on the input stages, the inputs may be operated with a lower overload margin than would otherwise be acceptable, allowing a possible improvement in signal to noise ratio. 6 Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated Product Folder Links: LM1036 |
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