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參數(shù)資料
| 型號： | TDA7540N |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 調(diào)諧器 |
| 英文描述： | 2-BAND, AUDIO TUNER, PQFP80 |
| 封裝： | 14 X 14 MM, 1.40 MM HEIGHT, ROHS COMPLIANT, LQFP-80 |
| 文件頁數(shù)： | 24/76頁 |
| 文件大?。?/td> | 1225K |
| 代理商： | TDA7540N |
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Functional description
TDA7540N
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 canceled. For reaching a high channel separation
the TDA7540 offers an I2C-bus programmable roll-off adjustment, which is able to
compensate the low pass behavior of the tuner section. Within the compensation range an
adjustment to obtain at least 40dB channel separation is possible. The bits for this
adjustment are located together with the level gain adjustment in one byte. This gives the
possibility to perform an optimization step during the production of the car radio where the
channel separation and the header are trimmed.
In addition to that the FM signal can be inverted.
Deemphasis and highcut
The deemphasis low pass allows to choose between a time constant of 50s/ 75
μs
(DEEMP) and 25
μs/37.5μs (DESFT). The highcut control range will be in both cases τ
HC =
2x
τ
Deemp. Inside the highcut control range (between VHCH and VHCL) the LEVEL signal is
converted into a 5-bit word, which controls the low pass time constant between
τ
Deemp...3xτDeemp. Thereby the resolution will remain always 5 bits independently of the
absolute voltage range between the VHCH- and VHCL-values.
The highcut function can be switched off by I2C-bus .
In AM mode (AMON = 1) the bits DEEMP and DESFT together with the AM corner
frequency bits (AMCF1...5) can be used as programmable AM frequency response. The
maximum corner frequency is defined by
τ
Deemp , the minimum is defined by 3xτDeemp
19kHz PLL and pilot tone detector
The PLL has the task to lock on the 19kHz pilot tone during a stereo-transmission to allow a
correct demodulation. The included pilot tone-detector enables the demodulation if the pilot
tone reaches the selected pilot tone threshold VPTHST. Two different thresholds are
available. The status of the detector output can be checked by reading the status byte of the
TDA7540N via I2C-bus or by reading the STEREO pin (pin 25).
Field strength control
The field strength input is used to control the highcut- and the stereoblend-function. In
addition the signal can be also used to control the noise blanker thresholds and as input for
the multipath detector.
Level-input and -gain
As level input for the stereo decoder is used the FSU voltage (pin22). Appling a capacitor at
FSTC (pin33) a desired time constant can by reached together with the internal resistor of
10k between FSU pin and FSTC pin.
In addition to that the LEVEL signal is low pass filtered internally in order to suppress
undesired high frequency modulation on the highcut- and stereoblend-function . The filter is
a combination of a 1st-order RC-low pass at 53kHz (working as anti-aliasing filter) and a 1st-
order switched capacitor low pass at 2.2kHz. The second stage is a programmable gain
stage to adapt the LEVEL signal internally . The gain is widely programmable in 8 steps
from 0dB to 4,7dB (step=0.67dB). These 3bits are located together with the Roll-Off bits in
the "Stereo decoder 8"-byte to simplify a possible adaptation during the production of the
car radio.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7540NTR | 功能描述:調(diào)諧器 AM/FM car radio Tuner IC Decoder RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
| TDA7541 | 功能描述:音頻放大器 AM/FM car radio Tuner IC Decoder RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TDA7541B | 功能描述:音頻放大器 AM/FM car radio Tuner IC Decoder RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TDA7541BW | 功能描述:音頻放大器 AM/FM car radio Tuner IC Decoder RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TDA7541BWTR | 功能描述:音頻放大器 AM/FM car radio Tuner IC Decoder RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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