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參數(shù)資料
| 型號： | TUA4401K |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 接收器 |
| 英文描述： | FM, AUDIO SINGLE CHIP RECEIVER, PQFP44 |
| 封裝： | MQFP-44 |
| 文件頁數(shù)： | 15/41頁 |
| 文件大?。?/td> | 990K |
| 代理商： | TUA4401K |
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Functional Description
3 - 14
TUA 4401K
Wireless Components
Specification, 17.02.00
3.4 Circuit Description
The TUA 4401K is a one chip FM car radio system consisting of RF frontend,
gain adjustable IF amplifier, FM-IF limiter amplifier, demodulator, PLL synthe-
sizer, IF counter for STS and ADC’s for fieldstrength and multipath detector.
The serial bus is a I2C type.
1. FM frontend
The frontend consists of a two pin varactor tuned oscillator, a double bal-
anced mixer and a prestage AGC control circuit. The mixer has an improved
intermodulation behaviour and converts the RF signal to the 10,7 MHz IF
range . Two inputs allow both symmetrical and unsymmetrical operation.
The integrated AGC stage for prestage control drives MOSFETS as well as
PIN diodes a with cur- rent driver. The AGC threshold can be set with a serial
bus controlled 2 Bit DAC. For background receiver application the oscillator
is able run at double frequency, a subsequent frequency divider by 2 is acti-
vated by serial bus to provide the correct mixer frequency.
2. FM IF amplifier
After the mixer an IF amplifier is present for IF post amplification. Input and
output impedance are both 330 Ohms for matching with ceramic filters. For
adjusting the over all gain the IF amplifier gain can be adjusted with a serial
bus controlled 4 Bit DAC.
3. FM limiter and demodulator
The FM IF amplifier includes a seven stage capacitive coupled limiter ampli-
fier and a fieldstrength generator with high linearity and increased dynamic
range. The coincidence demodulator has an additional AFC short loop cir-
cuit with integrated varactor diode in parallel to the external tank circuit to
improve the distortion bahaviour in case of detuning.
4. Multipath detector
A wideband multipath detector with analog output is available.
5. A/D converter for fieldstrength and multipath detector
The 7 bit A/D converter has two input channels and works as successive
approximation converter. The conversion time for both input signals is t = 32
s. The 7-bit digital-words from both channels (14 bit) are read out together
via bus into two bytes with the read subaddress 82H. The input voltage
range for both channels is 0...VREFD5V.
6. IF counter and multipath/fieldstrength evaluation for STS
FM center frequencies ar available in two ranges set by bit D7 in subaddress
05H. For D7=1 the range of centerfrequency is 20.800 MHz...22.3875 MHz
in 128 steps (12.5 kHz per step). For D7=0 the range of centerfrequency is
10.400 MHz...11.1937 MHz in 128 steps (6.25 kHz per step).
The gate time is adjustable in 8 steps from 320us...40.96ms and the toler-
ance of the accepted count value, the window is adjustable in 5 steps from
+/- (6.25kHz...100kHz) for D7=0 in sub-address 05H and
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TUA4401 | FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| TUA6010XS | 2-BAND, VIDEO TUNER, PDSO28 |
| TUA6010XS | VIDEO TUNER, PDSO28 |
| TUA6014-K | 2-BAND, VIDEO TUNER, PDSO28 |
| TUA6014-S | 2-BAND, VIDEO TUNER, PDSO28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TUA6010 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Wireless Components |
| TUA6010X | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:RF Mixer |
| TUA6010XS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TUA6012 | 制造商:SIEMENS 制造商全稱:Siemens Semiconductor Group 功能描述:Components for Entertainment Electronics |
| TUA6012XS | 制造商:SIEMENS 制造商全稱:Siemens Semiconductor Group 功能描述:Components for Entertainment Electronics |
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