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參數(shù)資料
| 型號(hào)： | TDA7340G |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | AUDIO SIGNAL PROCESSOR |
| 中文描述： | 音頻信號(hào)處理器 |
| 文件頁(yè)數(shù)： | 22/27頁(yè) |
| 文件大?。?/td> | 205K |
| 代理商： | TDA7340G |
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No possibility to change the loud boost rate at a
certain volume level.
The TDA7340G implementsa fullyprogrammable
loudness control in 15 steps of 1.25dB.
It allows a customized loudness response for
each application.
The external network connected to the loudness
pins LOUD_L and LOUD_R fixes the type of loud-
ness response
1) Simple Capacitor
The loudness effect is only a boost of low fre-
quencies.(see Fig.20)
2)Second order Loudness (boost of low and
high frequencies).
3)Second order decreased type Loudness
(lower boost of low and high frequencies).
4)Second order modified type Loudness (higher
boost of low and high frequencies).
BASS FILTER
Several bass filter types can be implemented.
NormallyitisusedthebasicT-typeBandpassFilter.
Starting from the filter component values (R1 in-
ternal and R2, C1, C2 external), the centre fre-
quency Fc, the gain Av at max bass boost and
the filter Q factor are computedas follows:
F
c
=
1
2
Π
√
(
R1
R2
C1
)
A
v
=
R2
C2
+
R2
C1
+
R1
C1
R2
C1
+
R2
C2
Q
=
√
R2
C1
+
R2
C2
(
R1
R2
C1
)
Viceversa fixed Fc, Av, and R1 = 50K
(internal
typ.+/-30%), theexternalcomponent valuesare:
C1
=
A
v
1
2
Π
R1
Q
C2
=
Q
Q
C1
A
v
1
Q
Q
R2
=
A
v
1
Q
Q
2
Π
C1
F
c
(
A
v
1
)
Q
TREBLE STAGE
The Treble stage is a simplehigh pass filter which
time constant is fixed by internalresistor (50Kohm
typ) and an externalcapacitorconnectedbetween
pins TREB_R/TREB_Land Ground.
IN-OUT PINS
The multiplexer output is available at OUT_R and
OUT_L pins for optional connection of external
graphic equalizer(TDA7316/TDA7317), surround
chip (TDA7346) etc.
The signal is fed in again at pins IN_L and IN-R.
In case of applicationwithout externaldevices the
pins OUT_L/OUT_R and IN_L/IN_R cannot be
short circuited, but must be decoupledvia capaci-
tor, necessaryto avoid signal DC jumps, generat-
ing ”Clicking” output noise.
The input impedance of the next volume stage is
35Kohm typical (minimum 24Kohm). A capacitor
no lower than 1uF shouldbe used.
INPUT SELECTOR
The multiplexer selector can choose one of the
following inputs:
- a differentialCD stereoinput.
- an FM stereo input coming from the on chip-
stereo decoder.
- a Cassettestereo input.
- a TelephoneDifferentialmono input.
- an AM stereo input or alternatively (sw pro-
grammable)an AM mono + BEEPmono.
The signal fed to the input pins must be decou-
pled via series capacitors. The minimum allowed
value depends on the correspondentinput imped-
ance.
For the CD diff input (Zi=10Kohm worst case ) a
Cin=4.7uF is recommended.
For the other inputs (70Kohm worst case, except
PHONE 14Kohm worst case but speech audio
band) a Cin=1uFis recommended.
TDA7340G
22/27
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PDF描述 |
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| TDA7340 | AUDIO SIGNAL PROCESSOR |
| TDA7340P | AUDIO SIGNAL PROCESSOR |
| TDA7342 | DIGITALLY CONTROLLED AUDIO PROCESSOR |
| TDA7343 | DIGITALLY CONTROLLED AUDIO PROCESSOR |
| TDA7343D | DIGITALLY CONTROLLED AUDIO PROCESSOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7340P | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:AUDIO SIGNAL PROCESSOR |
| TDA7340S | 功能描述:音頻 DSP Audio Signal Proc RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| TDA7342 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Digitally controlled audio processor |
| TDA7342_06 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Digitally controlled audio processor |
| TDA7342EQ2N | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Digitally controlled audio processor |
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