參數(shù)資料
型號(hào)： TUA4307
廠商： INFINEON TECHNOLOGIES AG
元件分類(lèi)： 接收器
英文描述： AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP80
封裝： MQFP-80
文件頁(yè)數(shù)： 16/48頁(yè)
文件大?。?/td> 952K
代理商： TUA4307
Functional Description
3 - 15
TUA 4307
Wireless Components
Specification, September 1999
3.3 Circuit Description
3.3.1
AM/FM-Receiver
The AM/FM-receiver part includes a 2-pin varactor tuned oscillator. In the FM
mode the direct oscillator frequency is fed into the double balanced FM mixer,
in the AM mode the divided by 4, 6, 8 or 10 oscillator frequency is fed into the
AM mixer.
The two separate symmetrical input stages of the IC, one optimized for FM-, the
other for AM- mode allow symmetrical and unsymmetrical prestage configura-
tion.
The AM and FM input frequencies are converted to a fix 1st IF in the 10.7 MHz
range. The FM-IF is post amplified in a separate IF amplifier with DC adjustable
gain, the AM-IF is fed directly to the 2nd mixer.
The TUA 4307 has been designed to work with a PLL in the 100MHz range in
both modes or in the AM- mode with the divided frequency.
Depending on the input signal strength, the integrated AGC stage for prestage
control drives PIN-Diodes as well as MOSFETs.
3.3.2
FM-MODE
FM-IF Demodulator
The FM-IF amplifier includes a 7 stage capacitive coupled limiter amplifier with
coincidence demodulator and AF output. The AF output signal can be continu-
ously attenuated to decrease the noise.
There is a field strength output (with min. 76 dB dynamic range, typ. ±1 dB non-
linearity and typ. ±3 dB temperature drift) and a soft mute function with adjust-
able mute depth (with full muting typ 80 dB).
An IF counter output with request function and a station detector with S curve
criterion and adjustable fieldstrength threshold are available
A multipath detector with analog output is available. Its input signal is fed from
the high pass filter of the stereo-decoder/noiseblanker and a second 80 kHz
1-pole high pass filter.
3.3.3
Stereodecoder
Power supply, reference current:
A temperature-stable, low noise reference voltage generator is used for better
ripple rejection and to generate a reference current. This current is used as a
time base for the deemphasis, the gate time of the pulse former, and the pilot
cancellation, avoiding temperature and tolerance effects.
MPX input, MPX filter:
A 4-pole low-pass filter determines the bandwidth of the MPX signal.
相關(guān)PDF資料
PDF描述
TUA4310XS 1-BAND, AUDIO TUNER, PDSO20
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TUA4401 FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
TUA6010XS 2-BAND, VIDEO TUNER, PDSO28
TUA6010XS VIDEO TUNER, PDSO28
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