- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98197 > TDA7513T (STMICROELECTRONICS) AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP80 PDF資料下載
參數(shù)資料
| 型號(hào)： | TDA7513T |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP80 |
| 封裝： | 14 X 14 MM, 1.40 MM HEIGHT, TQFP-80 |
| 文件頁數(shù)： | 31/84頁 |
| 文件大?。?/td> | 845K |
| 代理商： | TDA7513T |
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頁當(dāng)前第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頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁
TDA7513T
Functional description
like REF5V are derived from a bandgap circuit, therefore they have a temperature coefficient
which is practically zero.
3.5.9
Highcut control
The highcut control setup is similar to the stereoblend control setup, the starting point VHCH
can be set with 2 bits to be 42, 50, 58 or 66% of REF5V whereas the range can be set to be
17, 22, 28 or 33% of VHCH (see
3.5.10
Noise blanker
In the automotive environment the MPX signal is disturbed by spikes produced for example
by the ignition and by the wiper motor. The aim of the noiseblanker part is to cancel the
audible influence of these spikes. To perform this function the output of the stereo decoder is
held at the curent voltage for a time between 22 and 38
μs (programmable). The block
diagram of the noiseblanker is shown in fig.20. In the first stage the spikes are detected but
to avoid a wrong triggering on high frequency (white) noise a complex trigger desensitization
control is implemented. Behind the trigger stage a pulse former generates the "blanking"
pulse
3.5.11
Trigger path
The incoming MPX signal is highpassed by a filter with a corner frequency of 140kHz,
amplified and rectified. The rectified signal (RECT) is lowpassed to generate the signal
PEAK. Also noise at a frequency higher than 140kHz increases PEAK. The lowpass output
voltage can be adjusted by changing the noise rectifier discharge current. The PEAK
voltage is fed to a threshold generator which adds to the PEAK voltage a constant voltage
VTH, thus producing the trigger threshold PEAK+VTH. Both RECT and PEAK+VTH are fed
to a comparator which trig-gers a re-triggerable monoflop. The monoflop output activates
the sample-and-hold circuits in the signalpath for a selectable duration.
3.5.12
Automatic noise controlled threshold adjustment (ATC)
There are mainly two independent possibilities to program the trigger threshold:
a)
Programming the so-called "low threshold" in 8 steps;
b)
Programming the so-called "noise adjusted threshold" in 4 steps
The "low threshold" is active in combination with a good MPX signal without any noise; the
PEAK voltage is less than 1V. The sensitivity in this operating mode is high.
If the MPX signal is noisy the PEAK voltage increases due to the higher noise, which is also
rectified. With increasing of the PEAK voltage the trigger threshold increases, too. This
particular mechanism ("noise adjusted threshold") is programmable in 4 steps.
3.6
Automatic threshold control mechanism
3.6.1
Automatic threshold control by the stereoblend voltage
Besides the noise controlled threshold adjustment there is an additional possibility to
influence the trigger threshold which depends on the stereoblend control.
The point where the MPX signal starts to become noisy is fixed by the RF part. Therefore
also the starting point of the normal noise controlled trigger adjustment is fixed. In some
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TDA7521 | SPECIALTY ANALOG CIRCUIT, PQFP44 |
| TDA7528 | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| TDA7531 | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| TDA7535013TR | SERIAL INPUT LOADING, 20-BIT DAC, PDSO14 |
| TDA7535 | SERIAL INPUT LOADING, 20-BIT DAC, PDSO14 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7513T_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Single chip FM/AM tuner with stereo decoder and audio processor |
| TDA7514 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SINGLE-CHIP FM/AM TUNER WITH STEREO DECODER AND AUDIO PROCESSOR |
| TDA7515 | 功能描述:音頻 DSP RF Front End 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 |
| TDA7515_06 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:RF front-end for AM/FM-DSP car radios with IF sampling |
| TDA7515A | 制造商:STMicroelectronics 功能描述:TDA7515A - Trays |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。