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參數(shù)資料
| 型號(hào)： | TDA7403DTR |
| 廠(chǎng)商： | STMICROELECTRONICS |
| 元件分類(lèi)： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| 封裝： | SO-20 |
| 文件頁(yè)數(shù)： | 22/25頁(yè) |
| 文件大?。?/td> | 232K |
| 代理商： | TDA7403DTR |
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Input stages
The input circuits are the same as in preceeding
ST audioprocessors with exception of the CD in-
puts (see figure 1).
The typical input impedance is 100k
.
AutoZero
In order to reduce the number of pins there is no
AC coupling between the In-Gain and the follow-
ing stage, so that any offset generated by or be-
fore the In-Gain stage would be transferred or
even amplified to the output.
To avoid that effect a special offset cancellation
stage called AutoZero is implemented.
To avoid audible clicks the audioprocessor is
muted before the loudness stage during this time.
In some cases, for example if the
P is executing
a refresh cycle of the I
2C bus programming, it is
not useful to start a new AutoZero action because
no new source is selected and an undesired mute
would appear at the outputs. For such applica-
tions the TDA7403 could be switched in the "Auto
Zero Remain" mode (Bit 6 of the subaddress
byte). If this bit is set to high, the DATABYTE 0
could be loaded without invoking the AutoZero
and the old adjustment value remains.
Softmute
The digitally controlled softmute stage allows
muting/demuting the signal with a I
2C bus pro-
grammable slope. The mute process can either
be activated by the softmute pin or by the I
2C
bus. The slope is realized in a special S shaped
curve to mute slow in the critical regions (see fig-
ure 2).
For timing purposes the Bit 3 of the I
2C bus out-
put register is set to 1 from the start of muting un-
til the end of demuting.
D98AU951
100K
STEREODECODER
IN GAIN
CASSETTE
AM
MPX
Figure 1. Input stages
DESCRIPTION OF THE AUDIOPROCESSOR
1
EXT.
MUTE
+SIGNAL
REF
-SIGNAL
1
I
2C BUS
OUT
Time
D97AU634
Figure 2. Softmute Timing
2dB
1dB
-1dB
-2dB
Time
D97AU635
VOUT
10ms
Figure 3. Soft Step Timing
Note: Please notice that a started Mute action is always terminated
and could not be interrupted by a change of the mute signal.
Note: For steps more than 1dB the softstep mode should be
deactivated because it could generate a 1dB error during the
blend-time
TDA7403
6/25
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相關(guān)代理商/技術(shù)參數(shù) |
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