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参数资料
| 型号： | TDA6930X |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 接收器 |
| 英文描述： | AM, AUDIO/VIDEO DEMODULATOR, PDSO28 |
| 封装： | PLASTIC, DSO-28 |
| 文件页数： | 18/36页 |
| 文件大小： | 822K |
| 代理商： | TDA6930X |
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Applications
4 - 8
TDA 6930
Wireless Components
Specification, August 1999
4.2.3
Application hints
*) internal VCO : 2 frequency for any norm except L‘
**) internal VCO : 2 frequency for L‘
s
Application note 1 : Adjusting the tank circuit
At the desired IF-frequency the AFC-output current has to be zero. Therefore
the voltage at that pin will be Vs/2. This is achieved by adjusting 1st the coil, 2nd
Ra for L‘ mode.
No further aligment e.g. for sound S/N is necessary.
s
Application note 2 : FPLL, loopfilter response
Measuring the frequency response of the loop.
The frequency response of the FPLL can be measured at the loopfilter output
Pin 10. If a frequency modulated carrier is applied to the Picture carrier input the
demodulated signal occures at Pin 10. Within its bandwidth the FPLL can track
modulation frequencies, thus this frequencies can be measured there. The fre-
quency response with the recommended loopfilter can be seen in the picture
below.
Designing the frequency response
There should be no overshoot until 20 kHz. The bandwidth has to be high
enough to control the destortions generated by the tuner. To reject intercarrier
buzz at 250 kHz video modulation the loop filter response at that frequency
should be as low as possible.
Table 4-1 AFC adjust and VCO tank circuit dimension 1st VCO*
(frequency = 38.9 MHz)
2nd VCO frequency**
Ra
Rb
Lc
Cc
33.4 MHz
10k
4.7k
120nH
19.5pF
33.9 MHz
4.7k
10k
120nH
18pF
U10 (f)
U10 (o)
-3 dB
10
100
1k
10k
100k
1M
10M
0dB
10dB
-20dB
-30dB
-40dB
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