- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98196 > TDA7461NDTR (STMICROELECTRONICS) SPECIALTY CONSUMER CIRCUIT, PDSO28 PDF資料下載
參數(shù)資料
| 型號： | TDA7461NDTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO28 |
| 封裝： | SOP-28 |
| 文件頁數(shù)： | 20/48頁 |
| 文件大?。?/td> | 437K |
| 代理商： | TDA7461NDTR |
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頁當(dāng)前第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
TDA7461
Stereo decoder part
4.5.3
Demodulator
In the demodulator block the left and the right channel are separated from the MPX signal.
In this stage also the 19 kHz pilot tone is cancelled. For reaching a high channel separation
the TDA7461 offers an I2C bus programmable roll off adjustment which is able to
compensate the lowpass behavior of the tuner section.
If the tuner attenuation at 38 kHz is in a range from 20.2 % to 31 % the TDA7461 needs no
external network before the MPX pin. Within this range an adjustment to obtain at least
40 dB channel separation is possible. The bits for this adjustment are located together with
the fieldstrength adjustment in one byte. This gives the possibility to perform an optimization
step during the production of the carradio where the channel separation and the
fieldstrength control are trimmed.
Figure 21.
Signals during stereo decoder’s soft mute
4.5.4
De-emphasis and high cut
The lowpass filter for the de-emphasis allows to choose between a time constant of 50
μs
and 75
μs (bit D7, Stereo decoder byte).
The high cut control range will be in both cases tHC = 2 * tDeemp. Inside the high cut control
range (between VHCH and VHCL) the LEVEL signal is converted into a 5 bit word which
controls the lowpass time constant between tDeemp...3 × tDeemp.
There by the resolution will remain always 5 bits independently of the absolute voltage
range between the VHCH and VHCL values. The high cut function can be switched off by
I2C bus (bit D7, Fieldstrength byte set to "0").
4.5.5
PLL and pilot tone detector
The PLL has the task to lock on the 19 kHz pilotone during a stereo transmission to allow a
correct demodulation. The included detector enables the demodulation if the pilot tone
reaches the selected pilottone threshold VPTHST. Two different thresholds are available.
The detector output (signal stereo, see block diagram) can be checked by reading the status
byte of the TDA7461 via I2C bus.
SOFTMUTE
COMMAND
STD MUTE
VO
t
D97AU638
t
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| TDA7463 | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDIP16 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 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 |
| TDA7463A_1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW VOLTAGE TONE CONTROL DIGITALLY CONTROLLED AUDIO PROCESSOR |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。