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參數(shù)資料
| 型號： | TDA7460NDTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| 封裝： | ROHS COMPLIANT, SOP-20 |
| 文件頁數(shù)： | 24/49頁 |
| 文件大?。?/td> | 473K |
| 代理商： | TDA7460NDTR |
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Stereo decoder part
TDA7460ND
The gain can be programmed through 4 bits in the "Stereo decoder-Adjustment" byte.
The mono voltage VMO (0 dB channel separation) can be chosen selecting 33, 42, 50 or
58 % of REF5V.All necessary internal reference voltages like REF5V are derived from a
bandgap circuit. Therefore they have a temperature coefficient near zero. This is useful if the
fieldstrength signal is also temperature compensated.
But most if devices apply a level voltage with a TC of 3300 ppm. The TDA7460ND offers this
TC for the reference voltages, too. The TC is selectable with bit D7 of the "stereo decoder
adjustment" byte.
Figure 24.
Relation between internal and external LEVEL voltage and setup of stereo
blend
5.5.9
High cut control
The high cut control setup is similar to the stereo blend control setup: the starting point
VHCH can be set with 2 bits to be 42, 50, 58 or 66% of REF5 V whereas the range can be
set to be 17 or 33% of VHCH (see Figure 25.).
Figure 25.
High cut characteristics
5.6
Functional description of the noise blanker
In the automotive environment the MPX signal is disturbed by spikes produced by the
ignition and for example the wiper motor. The aim of the noise blanker part is to cancel the
audible influence of the spikes. Therefore the output of the stereo decoder is held at the
actual voltage for 40
μs.
In a first stage the spikes must be detected but to avoid a wrong triggering on high
frequency (white) noise a complex trigger control is implemented. Behind the trigger stage a
pulse former generates the "blanking" pulse. To avoid any crosstalk to the signal path the
noise blanker is supplied by his own biasing circuit.
INTERNAL
VOLTAGES
t
D97AU639
VSBL
REF 5V
SETUP OF VST
INTERNAL
VOLTAGES
t
33%
REF 5V
SETUP OF VMO
LEVEL
LEVEL INTERN
FIELDSTRENGHT VOLTAGE
VST
VMO
LEVEL INTERN
42%
50%
58%
VSBL
VST
VMO
FIELDSTRENGHT VOLTAGE
LOWPASS
TIME CONSTANT
D97AU640
τDeemp
FIELDSTRENGHT
VHCH
VHCL
3
τDeemp
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| TDA7461ND | SPECIALTY CONSUMER CIRCUIT, PDSO28 |
| TDA7461NDTR | SPECIALTY CONSUMER CIRCUIT, PDSO28 |
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| TDA7462D | SPECIALTY CONSUMER CIRCUIT, PDSO28 |
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相關(guān)代理商/技術(shù)參數(shù) |
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| 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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