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參數(shù)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(shù)： | 36/74頁 |
| 文件大小： | 1232K |
| 代理商： | TDA7402TR |
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TDA7402
Functional description of stereo decoder
Figure 29.
Signals during stereo decoder's SoftMute
Figure 30.
Signal control via SoftMute pin
6.2
InGain + infilter
The InGain stage allows adjustment of the MPX-signal to a magnitude of about 1Vrms
internally, which is the recommended value. The 4th order input filter has a corner frequency
of 80kHz and is used to attenuate spikes and noise, and acts as an anti-aliasing filter for the
following switch capacitor filters.
6.3
Demodulator
In the demodulator block, the left and the right channels are separated from the MPX signal.
In this stage the 19kHz pilot tone is cancelled. To reach a high channel separation the A619
offers an I2C bus programmable roll-off adjustment which is able to compensate for the
lowpass behavior of the tuner section. If the tuner's attenuation at 38kHz is in a range from
7.2% to 31.0%, the A619 needs no external network in front of the MPX-pin. Within this
range, an adjustment to obtain at least 40dB 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 car radio, where the
MP-HOLD
SOFTMUTE
PIN
D00AU1165
SOFTMUTE
PLL-HOLD
INFLUENCE
STDHMUTE
MUTED
STDHMUTE
INFLUENCE
SOFTMUTE
INFLUENCE
IIC-BUS
SOFTMUTE
INFLUENCE
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相關(guān)代理商/技術(shù)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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| 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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