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TEA6323 Datasheet(PDF) 5 Page - NXP Semiconductors |
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TEA6323 Datasheet(HTML) 5 Page - NXP Semiconductors |
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5 / 36 page  1995 Dec 20 5 Philips Semiconductors Preliminary specification Sound fader control circuit TEA6323T FUNCTIONAL DESCRIPTION The source selector allows either the source selection between the differential stereo input (IAL, IAR and COM) and three stereo inputs, or selection of four stereo inputs and the mono input (COM). The maximum input signal voltage is Vi(rms) = 2 V. The outputs of the source selector and the inputs of the following volume control parts are available at pins 13 and 11 for the left channel and pins 28 and 30 for the right channel. This offers the possibility of interfacing a noise reduction system. The volume control part is following the source selector. The signal phase from input volume control part to all outputs is 180 °. Fig.2 Pin configuration. handbook, halfpage TEA6323T MHA257 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 TL OUTLF OUTLR AGND DGND ICL i.c. IDL IAL i.c. IBL COM QSL IVL ILL OVL B1L B2L MUTE SDA ICR IDR Vref IAR IBR CAP QSR ILR IVR B1R OVR i.c. B2R TR OUTRF OUTRR VCC SCL n.c. n.c. The volume control function is split into two sections: volume I control block and volume II control block. The control range of volume I is between +20 dB and −31 dB in steps of 1 dB. The volume II control range is between 0 dB and −55 dB in steps of 1 dB. Although the theoretical possible control range is 106 dB (+20 to −86 dB), in practice a range of 86 dB (+20 to −66 dB) is recommended. The gain/attenuation setting of the volume I control block is common for both channels. The volume I control block operates in combination with the loudness control. The filter is linear when the maximum gain for the volume I control (+20 dB) is selected. The filter characteristic increases automatically over a range of 32 dB down to a setting of −12 dB. That means the maximum filter characteristic is obtained at −12 dB setting of volume I. Further reduction of the volume does not further influence the filter characteristic (see Fig.5). The maximum selected filter characteristic is determined by external components. The proposed application gives a maximum boost of 17 dB for bass and 4.5 dB for treble. The loudness may be switched on or off via I2C-bus control (see Table 7). The volume I control block has an output pin and is followed by the bass control block. An external filter for each channel in combination with internal resistors, provides the frequency response of the bass control (see Fig.3). The adjustable range is between −18 and +18 dB in steps of 1.8 dB at 46 Hz. Both, loudness and bass control result in a maximum bass boost of 35 dB for low volume settings. The treble control block offers a control range between −12 and +12 dB in steps of 1.5 dB at 15 kHz. The filter characteristic is determined by a single capacitor of 5.6 nF for each channel in combination with internal resistors (see Fig.4). The basic step width of treble control is 3 dB. The intermediate steps are obtained by switching 1.5 dB boost and 1.5 dB attenuation steps. The bass and treble control functions can be switched off via I2C-bus. In this event the internal signal flow is disconnected. The connections B2L and B2R are outputs and TL and TR are inputs for inserting an external equalizer. |
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