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參數資料
| 型號： | LA7567GVA |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封裝： | 0.225 INCH, SSOP-24 |
| 文件頁數： | 11/13頁 |
| 文件大?。?/td> | 196K |
| 代理商： | LA7567GVA |
No.7778-7/20
V10.V11. Black noise threshold level and clamp voltage . . . . . . [VBTH, VBCL]
(1) Apply DC voltage to the external AGC, IF AGC (pin 17) and adjust the voltage.
(2) fp = 45.75MHz 400Hz 40% AM 10mVrms (VIF input)
(3) Adjust the IF AGC (pin 17) voltage to operate the noise canceller.
Measure the VBTH, VBCL at test point A.
V12. Video S/N . . . . . . . . . . . . . . . . . . . . . . . . . . . . [S/N]
(1) Internal AGC
(2) fp = 45.75MHz CW = 10mVrms (VIF input)
(3) Measure the noise voltage at test point A in RMS volts through a 10kHz to 4MHz band-pass filter.
.......................Noise voltage (N)
(4)
V13. C/S beat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [ICS]
(1) Apply DC voltage to the external AGC IF AGC (pin 17) and adjust the voltage.
(2) fp = 45.75MHz CW; 10mVrms
fc = 42.17MHz CW; 10mVrms-10dB
fs = 41.25MHz CW; 10mVrms-10dB
(3) Adjust the IF AGC (pin 17) voltage so that the output level at test point A becomes 0.72Vp-p.
(4) Measure the difference between the levels at 3.58MHz and 0.92MHz.
V14. Frequency characteristics . . . . . . . . . . . . . . [fc]
(1) Apply DC voltage to the external AGC IF AGC (pin 17) and adjust the voltage.
(2) SG1: 45.75MHz continuous wave 10mVrms
SG2: 45.65MHz to 39.75MHz continuous wave 2mVrms
Add the SG1 and SG2 signals using a T pat and adjust each SG signal level so that the above-mentioned levels
are reached and input the added signals to the VIF IN.
(3) First set the SG2 frequency to 45.65MHz, and then adjust the IF AGC voltage (V17) so that the output level at
test point A becomes 0.5Vp-p.........V1
(4) Set the SG2 frequency to 39.75MHz and measure the output level..........V2
(5) Calculate as follows:
VBCL
VBTH
Time
Video output
(V)
S/N = 20 log
= 20 log
(dB)
Noise voltage (Vrms)
Video portion (Vp-p)
Noise voltage (Vrms)
1.12Vp-p
0.92MHz
3.58M
4.5M
Frequency(MHz)
Output
(dB)
C/S beat
(dB)
V1
V2
20log
fc =
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| LA7567GVA | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
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| LA75694M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For Use in TV/VTR Applications IF Signal Processing (VIF/SIF for Hi-Fi) |
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