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LM1036 データシート(PDF) 6 Page - Texas Instruments

部品番号 LM1036
部品情報  LM1036 Dual DC Operated Tone/Volume/Balance Circuit
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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
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Copyright © 1995–2013, Texas Instruments Incorporated
Product Folder Links: LM1036


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