- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358737 > LA7577N (Sanyo Electric Co.,Ltd.) Super-Split，PLL-II VIF and SIF IF Signal Processor for TV/VCRs(用于電視機/VCR應用的IF信號處理（鎖相環(huán)II VIF+SIF）電路) PDF資料下載
參數(shù)資料
| 型號： | LA7577N |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Super-Split，PLL-II VIF and SIF IF Signal Processor for TV/VCRs(用于電視機/VCR應用的IF信號處理（鎖相環(huán)II VIF+SIF）電路) |
| 中文描述： | 超斯普利特，鎖相環(huán)-Ⅱ資料表格及SIF中頻信號處理器的電視/錄像機（用于電視機/錄像機應用的中頻信號處理（鎖相環(huán)二資料表格強度因子）電路） |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 439K |
| 代理商： | LA7577N |
LA7577N
No. 4037—11/16
AFT Tank (Pins 11 and 12)
The automatic frequency tuner (AFT) tank connected to
pins 11 and 12 generates the 90
°
phase shift required for
quadrature detection. The band-pass frequency character-
istics of the IF SAW filter and the AFT tank are shown in
Figure 17(A) and 17(B), respectively. The combined
response is shown in Figure 17(C). The resulting extended
low-frequency response, which increases susceptibility to
incorrect operation, can be reduced by connecting capaci-
tor C2 in series with the AFT tank as shown in Figure 18.
The resultant frequency response is shown in Figure
17(D).
Capacitors C1 and C2 should have a ratio of approxi-
mately 5 to 1. An inductor or resistor should also be con-
nected in parallel with C2 to maintain the DC balance of
the AFT tank.
The AFT can be defeated by connecting pin 11 to ground
through resistor R1, which should be 20k
or lower.
Figure 17. AFT tank characteristics
AFT Output (Pin 14)
An external bleeder resistor is required to generate the
AFT voltage. The AFT loop time constant is formed by
external resistor R3 and capacitor C2, as shown in Figure
19. The resistor also provides overvoltage protection.
Fluctuations in the AFT quiescent output voltage, if
present in station selector systems using PLLs or voltage
synthesizers, can be reduced by connecting series resistor
R4 as shown in Figure 20. Note, however, that this also
reduces the AFT range.
Figure 18. AFT tank
Figure 19. AFT loop time constant
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LA7578N | IF Signal Processing (Super PLL-II VIF + SIF) Circuit for TVs and VCRs(用于電視機/VCR應用的IF信號處理（超鎖相環(huán)II VIF+SIF）電路) |
| LA7583 | IF Signal Processing Circuit (A 2 C PLL VIF + SIF) for TVs and VCRs(用于電視機/VCR應用的IF信號處理（自動調(diào)整控制 鎖相環(huán) VIF+SIF）電路) |
| LA7605M | Monolithic Linear IC Video Signal Processor |
| LA76070 | NTSC Color Television IC |
| LA76075 | NTSC Color Television Sets |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA7578 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LA7578N | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:IF Signal Processing (Super PLL-II VIF + SIF) Circuit for TVs and VCRs |
| LA7583 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:IF Signal Processing Circuit (A2C PLL VIF + SIF) for TVs and VCRs |
| LA7590 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| LA7600 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復。