- 您現在的位置：買賣IC網 > PDF目錄98195 > TDA7402TR (STMICROELECTRONICS) SPECIALTY CONSUMER CIRCUIT, PQFP44 PDF資料下載
參數資料
| 型號： | TDA7402TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封裝： | 10 X 10 MM, 1.40 MM HEIGHT, TQFP-44 |
| 文件頁數： | 35/74頁 |
| 文件大?。?/td> | 1232K |
| 代理商： | TDA7402TR |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁當前第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁
Functional description of stereo decoder
TDA7402
6
Functional description of stereo decoder
Figure 28.
Block diagram of stereo decoder
The stereo decoder-part of the A619 (see
Figure 28) contains all functions necessary to
demodulate the MPX-signal like pilot tone dependent Mono/Stereo switching as well as
"stereo blend" and "highcut". Adaptations like programmable input gain, roll off
compensation, selectable de-emphasis time constant and a programmable fieldstrength
input allow to use different IF devices.
6.1
Stereo decoder mute
The A619 has a fast and easy to control RDS mute function which is a combination of the
audioprocessor's SoftMute and the high ohmic mute of the stereo decoder. If the stereo
decoder is selected and a SoftMute 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.
Additionally the PLL can be set to "Hold" mode, which disables the PLL input during the
mute time. 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. 26 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 also set the stereo decoder 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. No further mute command should be applied.
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
NOISE
SB CONTROL
MULTIPATH DET.
DEEMPHASIS
+ HIGHCUT
t=50.62..5.75,100
μs
(37.5,47,56,75
μs)
REF 5V
VSBL
MPHCINFL
MPHCOUT
MPSBOUT
HC
CONTROL
VHCCH
VHCCL
D
5 bits
A
LEVEL INPUT
LEVELSB-LP
LEVEL
MPSBINFL
FM_L
FM_R
MPX
100K
AM
AM-IF
100K
D00AU1135
LEVELHC-LP
GAIN 0..6dB
QUALITY
DETECTOR
QUAL
MP-OUT
MP-IN
-
+
相關PDF資料 |
PDF描述 |
|---|---|
| TDA7402 | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| TDA7403D | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| TDA7403DTR | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| TDA7404DTR | 1 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO28 |
| TDA7404D | 1 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO28 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TDA7403 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:BASIC SIGNAL PROCESSOR |
| TDA7403_02 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:BASIC SIGNAL PROCESSOR |
| TDA7403D | 功能描述:音頻 DSP Basic Signal Process RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| TDA7403DTR | 功能描述:音頻 DSP Basic Signal Process RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| TDA7404 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CARRADIO-SIGNAL-PROCESSOR |
發(fā)布緊急采購，3分鐘左右您將得到回復。