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參數(shù)資料
| 型號(hào)： | TDA7514 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | SINGLE-CHIP FM/AM TUNER WITH STEREO DECODER AND AUDIO PROCESSOR |
| 中文描述： | 單芯片F(xiàn)M /調(diào)幅調(diào)諧立體聲解碼器和音頻處理器 |
| 文件頁數(shù)： | 63/74頁 |
| 文件大小： | 604K |
| 代理商： | TDA7514 |
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TDA7514
5
FUNCTIONAL DESCRIPTION
5.1 FM TUNER SECTION
5.1.1
The FM tuner section features an image rejection mixer. Its low noise figure allows connecting the antenna
to the mixer without any discrete preamplifier. The external preselection circuit can be realized with one
tuned filter only. The filter can be electrically aligned by shifting the filter tuning voltage with respect to the
VCO tuning voltage through an 8 bit DAC.
The mixer image rejection trimming is obtained by tuning the relative phase offset and relative gain of the
I and Q mixer paths. The mixer output (common with the AM 1st mixer output) is connected to a tuned IF
transformer, with the possibility of electrically adjusting the center frequency through an internal 4 bit ca-
pacitor bank.
The FM AGC can operate in two different software-selectable modes:
FRONT END
– Keyed Wide band mode: the AGC detects the strength of the wide band RF signal at the input of the
1st mixer to activate the AGC attenuation; the starting point is programmable via software and is var-
ied over a >40 dB range by the very narrow band Smeter signal in order to set a maximum suppres-
sion limit that prevents the desired channel from decreasing below an acceptable level;
– Wide band + Narrow band mode: the AGC detects the strength of both the wide band RF signal at
the input of the 1st mixer and of the narrow band IF signal at the output of the IFT1(both starting points
are software-programmable); this mode allows a smooth transition between near adjacent and far ad-
jacent suppression.
The AGC features a single current output used to drive the front end P-I-N diode attenuator.
5.1.2
FM channel selection is mainly done by use of external ceramic filters. Two different software-program-
mable configurations are available:
IF FILTERING
– normal FM mode: three ceramic filters can be connected using two impedance-matched IF amplifiers
(both with programmable gains); the third ceramic filter is connected to the 2nd mixer input;
– high-performance Weather Band applications: when an optimum Weather Band channel selection is
required, the TDA7514 allows to connect a dedicated narrow band external 450 kHz ceramic filter to
implement this function. In this case only two 10.7 MHz ceramic filters can be connected for standard
FM selectivity. The 1st ceramic filter is normally connected between the IFT1 output and the 1st IF
amplifier input; the 2nd ceramic filter is connected between the 1st IF amplifier input and the 2nd mix-
er input; the 450 kHz WB filter is connected between the 2nd IF amplifier output and the 2nd IF am-
plifier input. Both the single standard FM IF amplifier gain and the 450 kHz WB filter driver IF amplifier
gain are software programmable.
5.1.3
The TDA7514 features a fully integrated FM demodulator which requires a lower IF than 10.7 MHz. There-
fore a 2nd mixer is provided to down-convert IF1 down to 450 kHz. The 10.25 MHz frequency needed to
drive the 2nd mixer is provided by the XTAL oscillator. Limiting is performed at IF2 through a 5 stage lim-
iter. The demodulator exhibits a very linear frequency-voltage conversion. Precise cancellation of the de-
modulator output voltage offset is available via software control especially for high audio gain WB
applications.
Field strength measurement (Smeter) is performed through use of a separate IF1 limiter and logarithmic
amplifier. The IF1 limiter output is also used to feed the FM IF counter block.
LIMITING AND DEMODULATION
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