參數(shù)資料
型號(hào)： TDA7461ND
廠商： STMICROELECTRONICS
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PDSO28
封裝： SOP-28
文件頁(yè)數(shù)： 25/48頁(yè)
文件大?。?/td> 437K
代理商： TDA7461ND
TDA7461
Stereo decoder part
Because of the overlap of this range and the range of the stereo/mono transition it can be
controlled by stereo blend. This threshold increase is programmable in 3 steps or switched
off with bits D0 and D1 of the fieldstrength control byte.
4.6.4
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,
4.7
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.
4.8
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 k
Ω is disconnected from the pin. The internal signals
available are shown in the software specification.
Figure 26.
Block diagram of the multipath detector
RECTIFIER
BANDPASS
19KHz
-
to SB
D97AU880
MPIN
GAIN
2 BITS
GAIN
2 BITS
DC=1
μA
VDD
MPOUT
LEVEL
int. INFLUENCE
220nF
相關(guān)PDF資料
PDF描述
TDA7461NDTR SPECIALTY CONSUMER CIRCUIT, PDSO28
TDA7461N SPECIALTY CONSUMER CIRCUIT, PDIP28
TDA7462D SPECIALTY CONSUMER CIRCUIT, PDSO28
TDA7463AD 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO20
TDA7463A 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO20
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA7461NDTR 功能描述:音頻 DSP CAR RADIO SIGNAL 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
TDA7462 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DUAL AUDIOPROCESSOR WITH COMPANDER AND SUBWOOFER OUTPUT
TDA7462D 功能描述:音頻 DSP Dual Audioprocessor 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
TDA7462D013TR 功能描述:音頻 DSP DUAL AUDIOPROCESSOR COMPANDER /SUBWOOFER 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
TDA7463A 功能描述:多媒體雜項(xiàng) Lo Vltg TONE CONTROL RoHS:否 制造商:Texas Instruments 類型: 通道數(shù)量: 轉(zhuǎn)換速率:540 Mbps 分辨率: 封裝 / 箱體:SOIC-16 封裝:Tube
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