參數(shù)資料
型號(hào)： TDA7460ND
廠商： STMICROELECTRONICS
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PDSO20
封裝： ROHS COMPLIANT, SOP-20
文件頁(yè)數(shù)： 20/49頁(yè)
文件大?。?/td> 473K
代理商： TDA7460ND
TDA7460ND
Stereo decoder part
5.5
Description of stereo decoder
The stereo decoder part of the TDA7460ND (see Figure 20.) contains all functions
necessary to demodulate the MPX signal like pilot tone dependent mono/stereo switching
as well as "stereo blend" and "high cut" functions.
Adaptations like programmable input gain, roll-off compensation, selectable de-emphasis
time constant and a programmable fieldstrength input allow to use different IF devices.
Figure 21.
Block diagram of the stereo decoder
5.5.1
Stereo decoder mute
The TDA7460ND has a fast and easy to control RDS mute function which is a combination
of the audioprocessor soft mute and the high-ohmic mute of the stereo decoder. If the stereo
decoder is selected and a soft mute command is sent (or activated through the SM pin) the
stereo decoder will be set automatically to the high-ohmic mute condition after the audio
signal has been softmuted.
Hence a checking of alternate frequencies could be performed. To release the system from
the mute condition simply the unmute command must be sent: the stereo decoder is
unmuted immediately and the audioprocessor is softly unmuted. Fig. 18 shows the output
signal VO as well as the internal stereo decoder mute signal. This influence of Softmute on
the stereo decoder mute can be switched off by setting bit 3 of the Softmute byte to "0". A
stereo decoder mute command (bit 0, stereo decoder byte set to "1") will set the stereo
decoder in any case independently to the high-ohmic mute state.
If any other source than the stereo decoder is selected the decoder remains muted and the
MPX pin is connected to Vref to avoid any discharge of the coupling capacitor through
leakage currents.
INGAIN
3.5 ... 11dB
STEP 2.5dB
INFILTER
LP 80KHz
4.th ORDER
DEMODULATOR
- PLOT CANC
- ROLL-OFF COMP.
- LP 25KHz
PLL +
PILOT-DET.
F19
NOISE BLANKER
F38
STEREO
HOLDN
SB CONTROL
DEEMPHASIS
+ HIGHCUT
t=50 or 75
μs
REF 5V
VSBL
MPINFL
LEVEL INTERN
HC
CONTROL
VHCCH
VHCCL
-
MULTIPATH
DETECTOR
D
A
MPOUT
LEVEL INPUT
LP 2.2KHZ
1.th ORDER
MPIN
LEVEL
FM_L
FM_R
MPX
100K
D97AU762
GAIN 0..10dB
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PDF描述
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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
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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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