TDA7719TR データシートの表示（PDF） - STMicroelectronics
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TDA7719TR Datasheet PDF : 46 Pages
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Description
TDA7719
4.2
Mixing
The device provides mixing function which allows the mixing source mixed into front and
rear speaker output independently. The mixing source can be any single-ended input,
mono-differential input or beep input (Mono single-ended input when DC offset detector is
not used). In order to adjust the level of mixing signal, the mixing selector is followed with a
0 dB~-31 dB attenuator. The maximum mixing input signal level is 1.6 Vrms for single-ended
input and mono-differential input. For beep input, the maximum input signal level is about
1.4 Vrms. The block diagram of the mixing function is shown below.
Figure 4. Block diagram of mixing stage
SE Inputs
MD Inputs
Beep
Mix ing
Selector
0~-31dB
Speaker
Attenuator
Note:
Since the input stage of this device has different configurations, the corresponding sources
for mixing selector are also different according to the configurations. The following table
defines the available sources for mixing under different configurations.
Table 8. Available sources for mixing
Mix selector bits 000
001
010
011
100
101
110
111
(Byte2 Bit2~Bit0) MixIN0 MixIN1 MixIN2 MixIN3 MixIN4 MixIN5 MixIN6 MixIN7
CFG0
CFG1
CFG2
CFG3
CFG4
CFG5
CFG6
CFG7
NA
SE1
SE1
SE1
NA
NA
MD3
SE1
NA
NA
NA
NA
NA
Beep Mute
SE2
SE3
NA
NA
NA
Beep Mute
SE2
SE3
SE4
SE5
NA
Beep Mute
SE2
SE3 MD1
NA
MD2 Beep Mute
NA
NA
NA
NA
NA
Beep Mute
NA
NA
SE4
SE5
NA
Beep Mute
SE2
SE3
NA
NA
NA
Beep Mute
SE2
SE3
NA
NA
NA
Beep Mute
Only light grey cells are allowed mixing input. The dark grey cells are not allowed.
The beep input is available only when DC offset detector function is not used.
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Doc ID 13698 Rev 5
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