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參數(shù)資料
| 型號(hào)： | TDA7340G |
| 廠(chǎng)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)： | 21/27頁(yè) |
| 文件大小： | 205K |
| 代理商： | TDA7340G |
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filter, the bass cut response becomes a low pass
filter, while the response in bass boost condition
is unchanged.
The feature is useful for human ear equalization
in noisy enviroments like cars etc.
See examples in Fig. 18 (symmetrical response)
and Fig.19 (unsymmetrical response).
TRANSMITTED DATA (SEND MODE)
The TDA7340G allows the reading of four info
bits.
The type (Stereo/Mono) of received broadcasting
signal is easily checked and displayed by using
the
ST
bit.
The
P
bit check is useful in tuning jumps without
signal muting.
The
SM
soft mute status becomes active immedi-
ately, when bit D0 is set to 1 (soft mute ON,
MUTE byte) and not when the signal level has
reached the 60 dB final attenuation.
TDA7340G I
2
C BUS PROTOCOL
The protocol is standard I
2
C, using subaddress
byte plus data bytes (see pagg.11to 16).
The optional Autoincrement mode allows to re-
fresh all the bytes registers with transmission of a
single subaddress, reducing drastically the total
transmission time.
Without autoincrement, subaddress bit
I = 0,
to
refresh all the bytes registers (10), it is necessary
to transmit 10 times the chip address, the subad-
dress and the data byte.
Working with a 100Kb/sclock speed the total time
would be :
[(9*3+2)*10]bits*10us=2.9ms
Instead using autoincrement mode, subaddress
bit
I=1,
the total time will be:
(9*12+2)*10us=1.1ms.
The autoincrement mode is useful also to refresh
partially the data. For example to refresh the 4
speakers attenuatorsit is possibleto programthe
subaddress Spkr LF (code XX010100), followed
by the data byte of SPKR LF, LR, RF, RR in se-
quence.
Note:
that the autoincrement mode has a module 16
counter, whereas the total used register bytes are
10.
It is not correct to refresh all the 10 bytes starting
from a subaddressdifferentthan XX010000.
For example using subaddress XX010010 (vol-
ume) the registers
from Volume to Stereode-
coder (see pag.11) are correctly updated but the
next two transmitted bytes instead to refer to the
wanted Input selector and Loudness are dis-
charged. (the solution in this case is to send two
separated pattern in autoinc mode, the first com-
posed by address, subaddressXX010010, 8 data
bytes, and the second composed by address,
subaddressXX010000,2 data bytes).
With autoincrement disabled, the protocol allows
the transmission in sequenceof N data bytes of a
specific register, without necessity to resend each
time the addressand subaddressbytes.
This feature can be implemented, for example, if
a gradual Volume change has to be performed (
the MCU has not to send the STOP condition,
keeping active the TDA7340G communication).
WARNING
The TDA7340G always needs to receive a STOP
condition, before beginning a new START condi-
tion. The device doesn’t recognize a START con-
dition if a previously active communication was
not ended by a STOP condition.
I
2
C BUS READ MODE
The TDA7340G gives to the master a 1 byte
”TRANSMITTED INFO” via I2C bus in read
mode. The read mode is Master activated by
sending the chip address with LSB set to 1, fol-
lowed by acknowledgebit.
The TDA7340G recognizes the request. At the
following master generated clocks bits, the
TDA7340G
issues the TRANSMITTED INFO
byte on the SDA data bus line (MSB transmitted
first).
At the nineth clock bit the MCU master can:
- acknowledge the reception, starting in this
way the transmission of another byte from
the TDA7340G.
- no acknowledge, stopping the read mode
communication.
LOUDNESS STAGE
The previousSTMicroelectronics audioprocessors
were implementing a fixed loudness response,
only ON/OFF sw programmable.
bit
P = 0
bit
P = 1
Pause active
No pause detected
bit
ZM = 1
bit
ZM = 0
Zero cross mute ON
Zero cross mute OFF
bit
SM = 1
bit
SM = 0
Soft mute ON
Soft mute OFF
bit
ST = 1
bit
ST = 0
Stereosignaldetected(inputMPX)
Mono signal detected(input MPX)
TDA7340G
21/27
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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 |
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| TDA7340P | 制造商:STMICROELECTRONICS 制造商全稱(chēng):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(chēng):STMicroelectronics 功能描述:Digitally controlled audio processor |
| TDA7342_06 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:Digitally controlled audio processor |
| TDA7342EQ2N | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:Digitally controlled audio processor |
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