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| 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(shù)： | 42/74頁 |
| 文件大小： | 1232K |
| 代理商： | TDA7402TR |
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TDA7402
Functional description of the multipath detector
8
Functional description of the multipath detector
Using the multipath detector the audible effects of a multipath condition can be minimized. A
multipath condition is detected by rectifying the spectrum around 19kHz in the fieldstrength
signal. An external capacitor is used to define the attack and decay times for the stereo
blend (see block diagram,
Figure 34). Due to the very small charge currents this capacitor
should be a low leakage current type (e.g ceramic). Using this configuration an adaptation to
the user's requirement is possible without effecting the "normal" fieldstrength input (level) for
the stereo decoder. This application is given in
Figure 34. Another (internal) time constant is
used to control the Highcut through the multipath detector
Selecting the "internal influence" in the configuration byte the stereo-blend and/or the
highcut is automatically invoked during a multipath condition according to the voltage
appearing at the MP_OUT pin.
Figure 35.
Block diagram of the multipath detector
8.1
Quality detector
The A619 offers a quality detector output which gives a voltage representing the FM
reception conditions. To calculate this voltage the MPX-noise and the multipath-detector
output are summed according to the following formula :
VQual = 1.6 (VNoise-0.8 V)+ a (REF5V-VMpout).
The noise-signal is the PEAK signal without additional influences (see the noiseblanker
description). The factor 'a' can by programmed to 0.7 .... 1.15. The output is a low
impedance output able to drive external circuitry as well as simply fed to an AD converter for
RDS applications.
INT.
INFLUENCE
CHARGE
0.25
μA/0.5μA
FAST
CHARGE
300
μA
LEVEL
D00AU1166
LOWPASS
2.2KHz
BANDPASS
19KHz
RECTIFIER
SHIFT
0 ... 1.5V
LOWPASS
100Hz
=
LOWPASS
53KHz
INT.
INFLUENCE
MP HOLD
GAIN 2 bits
MP_IN
to HCC
to SB
470nF
MP_OUT
VDD
=
VDD
High-Cut-Infl.
Attach<500
μs
Decay=2/10ms
Stereoblend-Infl.
Attach=1ms
Decay=4/8s
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相關代理商/技術參數(shù) |
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| TDA7403 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:BASIC SIGNAL PROCESSOR |
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| 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 |
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