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參數(shù)資料
| 型號： | tda 6190 |
| 廠商： | SIEMENS AG |
| 英文描述： | DVB-IF Mixer(DVB-IF 混頻器) |
| 中文描述： | 的DVB -中頻混合機（的DVB -中頻混頻器） |
| 文件頁數(shù)： | 12/26頁 |
| 文件大?。?/td> | 489K |
| 代理商： | TDA 6190 |
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Functional Description
3 - 5
TDA 6190
Wireless Components
Specification, April 2000
3.4
Functional Blocks
3.4.1
Power Supply, Reference Voltage
The 3.6 V low noise reference voltage Vref is used as a reference for the adjust-
ment of the delayed tuner AGC. The reference voltage has a low temperature
coefficient and high line regulation.
3.4.2
DVB-IF Input Amplifier, AGC
The filtered IF signal is fed to the balanced input pins IF1 / IF2 of the gain con-
trolled amplifier, where it is amplified and then down converted to the output fre-
quency signals.
TDA 6190X: The control voltage for the gain-controlled amplifier at pin IFAGC
is derived from a peak level detector at the down converted outputs.
TDA 6190T, TDA 6190S: The control voltage for the gain-controlled amplifier at
pin IFAGC is applied from external source.
If the IFAGC control voltage level exceeds an adjustable value (TAGCthr), a
sink current at TunAGC is generated which controls the tuner gain.
3.4.3
Oscillator
The symmetrical 4 pin voltage controlled oscillator feeds the mixer to generate
the down converted DVB-IF signals.The frequency of the VCO is below or
above the input frequency of the AGC amplifier. The control voltage for the
external varactor diode is derived from the DVB processor.
3.4.4
Mixer and Output Buffers
The mixer converts the filtered and amplified IF signal down to the low IF fre-
quency. This frequency is fed to a balanced output pair OUT1 and OUT2.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| TDA6190T | 制造商:Infineon Technologies AG 功能描述: |
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| TDA6192 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Gain-controlled IF Amplifier |
| TDA6192-T | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Gain-controlled IF Amplifier |
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