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參數(shù)資料
| 型號： | TDA7460ND |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| 封裝： | ROHS COMPLIANT, SOP-20 |
| 文件頁數(shù)： | 26/49頁 |
| 文件大?。?/td> | 473K |
| 代理商： | TDA7460ND |
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Stereo decoder part
TDA7460ND
5.6.4
Over deviation detector
If the system is tuned to stations with a high deviation the noise blanker can trigger on the
higher frequencies of the modulation. To avoid this wrong behavior, which causes noise in
the output signal, the noise blanker offers a deviation dependent threshold adjustment.
By rectifying the MPX signal a further signal representing the actual deviation is obtained. It
is used to increase the PEAK voltage. Offset and gain of this circuit are programmable in 3
steps with the bits D6 and D7 of the stereo decoder byte (the first step turns off the detector,
see Figure 18.).
5.7
Functional description of the multipath detector
Using the internal detector the audible effects of a multipath condition can be minimized. A
multipath condition is detected by rectifying the 19 kHz spectrum in the fieldstrength signal.
Selecting the "internal influence" in the configuration byte, the channel separation is
automatically reduced during a multipath condition according to the voltage appearing at the
MPOUT pin.
To obtain a optimal performance an adaptation is necessary. Therefore the gain of the
19 kHz bandpass is programmable in four steps as well as the rectifier gain. The attack and
decay times can be set by the external capacitor value.
5.8
Test mode
During the test mode which can be activated by setting bit D0 of the testing byte and bit D5
of the subaddress byte to "1" several internal signals are available at the CASSR pin. During
this mode the input resistance of 100 kOhm is disconnected from the pin. The internal
signals available are shown in the software specification.
Figure 27.
Block diagram of the multipath detector
RECTIFIER
BANDPASS
19KHz
-
to SB
MP ENABLE
D98AU862
MPIN
GAIN
2 BITS
GAIN
2 BITS
DC=1
μ
VDD
15K
MPOUT
TO PHONE_GND - APR
LEVEL
int. INFLUENCE
220nF
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PDF描述 |
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| TDA7460NDTR | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| TDA7461ND | SPECIALTY CONSUMER CIRCUIT, PDSO28 |
| TDA7461NDTR | SPECIALTY CONSUMER CIRCUIT, PDSO28 |
| TDA7461N | SPECIALTY CONSUMER CIRCUIT, PDIP28 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7460NDTR | 功能描述:音頻 DSP CARRADIO SIGNAL PROCESSOR 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 |
| TDA7461 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CAR RADIO SIGNAL PROCESSOR |
| TDA7461D | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CAR RADIO SIGNAL PROCESSOR |
| TDA7461N | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CAR RADIO SIGNAL PROCESSOR |
| TDA7461N_03 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CAR RADIO SIGNAL PROCESSOR |
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