TEA6323T Philips Semiconductors (Acquired by NXP), TEA6323T Datasheet - Page 5

• Manufacturer Part Number: TEA6323T
• Description: TEA6323T; Sound Fader Control Circuit
• Manufacturer: Philips Semiconductors (Acquired by NXP)

Philips Semiconductors
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 V
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 .
1995 Dec 20
handbook, halfpage
Sound fader control circuit
i(rms)
OUTLR
OUTLF
DGND
MUTE
AGND
COM
SDA
QSL
OVL
B2L
B1L
IVL
IDL
ICL
IBL
IAL
ILL
= 2 V. The outputs of the source selector
i.c.
i.c.
TL
Fig.2 Pin configuration.
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
TEA6323T
MHA257
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
SCL
n.c.
V CC
n.c.
OUTRR
OUTRF
TR
B2R
B1R
OVR
IVR
ILR
QSR
IDR
V ref
ICR
CAP
IBR
i.c.
IAR
5
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
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 I
(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
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 I
disconnected. The connections B2L and B2R are outputs
and TL and TR are inputs for inserting an external
equalizer.
31 dB in steps of 1 dB. The volume II control range is
12 and +12 dB in steps of 1.5 dB at 15 kHz. The filter
2
C-bus. In this event the internal signal flow is
Preliminary specification
TEA6323T
2
C-bus control