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參數(shù)資料
| 型號： | TDA7460NDTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| 封裝： | ROHS COMPLIANT, SOP-20 |
| 文件頁數(shù)： | 22/49頁 |
| 文件大?。?/td> | 473K |
| 代理商： | TDA7460NDTR |
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TDA7460ND
Stereo decoder part
5.5.5
PLL and pilot tone detector
The PLL has the task to lock on the 19kHz 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 Figure 1: Block diagram) can be checked by
reading the status byte of the TDA7460ND via I2C bus.
5.5.6
Fieldstrength control
The fieldstrength input is used to control the high cut and the stereo blend function. In
addition the signal can be also used to control the noise blanker thresholds.
5.5.7
Level input and gain
To suppress undesired high frequency modulation on the high cut and stereo blend function
the LEVEL signal is lowpass filtered firstly. The filter is a combination of a 1st order RC
lowpass at 53 kHz (working as anti-aliasing filter) and a 1st-order switched capacitor
lowpass at 2.2 kHz. The second stage is a programmable gain stage to adapt the LEVEL
signal internally to different IF.
The gain is widely programmable in 16 steps from 0 dB to 10 dB (step = 0.67 dB). These 4
bits are located together with the roll-off bits in the "Stereo decoder Adjustment" byte to
simplify a possible adaptation during the production of the carradio.
Figure 23.
Internal stereo blend characteristics
5.5.8
Stereo blend control
The stereo blend control block converts the internal LEVEL voltage (LEVEL INTERN) into
an demodulator compatible analog signal which is used to control the channel separation
between 0dB and the maximum separation. Internally this control range has a fixed upper
limit which is the internal reference voltage REF5V. The lower limit can be programmed to
be 33%, 42%, 50% or 58% of REF5V (see Figure 24.).
To adjust the external LEVEL voltage to the internal range two values must be defined: the
LEVEL gain LG and VSBL. To adjust the voltage where the full channel separation is
reached (VST) the LEVEL gain LG has to be defined. The following equation can be used to
estimate the gain:
REF5V
Field strenght voltage [STER
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| TDA7461ND | SPECIALTY CONSUMER CIRCUIT, PDSO28 |
| TDA7461NDTR | SPECIALTY CONSUMER CIRCUIT, PDSO28 |
| TDA7461N | SPECIALTY CONSUMER CIRCUIT, PDIP28 |
| TDA7462D | SPECIALTY CONSUMER CIRCUIT, PDSO28 |
| TDA7463AD | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7461 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CAR RADIO SIGNAL PROCESSOR |
| TDA7461D | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CAR RADIO SIGNAL PROCESSOR |
| TDA7461N | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CAR RADIO SIGNAL PROCESSOR |
| TDA7461N_03 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CAR RADIO SIGNAL PROCESSOR |
| TDA7461ND | 功能描述:音頻 DSP Car Radio Signal 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 |
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