參數(shù)資料
型號(hào)： tda 6930
廠商： SIEMENS AG
英文描述： Multistandard VIF-PLL(多級(jí)標(biāo)準(zhǔn)的VIF-PLL)
中文描述： 多標(biāo)準(zhǔn)資料表格鎖相環(huán)（多級(jí)標(biāo)準(zhǔn)的資料表格，鎖相環(huán)）
文件頁數(shù)： 25/36頁
文件大?。?/td> 822K
代理商： TDA 6930
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‘
I
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.
I
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
U
10
(f)
U
10
(o)
-3 dB
10
100
1k
10k
100k
1M
10M
0dB
10dB
-20dB
-30dB
-40dB
相關(guān)PDF資料
PDF描述
TDA1006A MOTOR REGULATOR WITH AUTOMATIC TAPE END INDICATOR
TDA1085C Universal Motor Speed Controller(通用電機(jī)速度控制器)
TDA1085 UNIVERSAL MOTOR SPEED CONTROLLER
TDA1085C UNIVERSAL MOTOR SPEED CONTROLLER
TDA1085CD UNIVERSAL MOTOR SPEED CONTROLLER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA7000 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:FM radio circuit
TDA7010 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:FM radio circuit
TDA7010T 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:FM radio circuit
TDA7010T/V3 制造商:NXP Semiconductors 功能描述:FM RADIO CIRCUIT SMD 7010 SOIC16
TDA7010T/V3 制造商:NXP Semiconductors 功能描述:FM RADIO CIRCUIT SMD 7010 SOIC16
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*