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參數(shù)資料
| 型號(hào)： | LA75600VA |
| 元件分類(lèi)： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封裝： | 0.225 INCH, SSOP-24 |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大?。?/td> | 386K |
| 代理商： | LA75600VA |
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LA75600VA
No.A0325-6/17
V10. V11 Black noise threshold level and clamp voltage …… [VBTH, VBCL]
(1) Apply DC voltage to the external AGC, IF AGC (pin 17) and vary it.
(2) fp = 45.75MHz 15kHz 78% AM10mVrms (VIF input)
(3) Adjust the IF AGC (pin 17) voltage to operate the noise canceller.
Measure the VBTH, VBCL at test point A.
VBCL
VBTH
Time
Video output
(V)
V12. Video S/N …… [S/N]
(1) Internal AGC
(2) fp = 45.75MHz continuous wave = 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 …… [IC-S]
(1) Apply DC voltage to the external AGC IF AGC (pin 17) and vary it.
(2) fp = 45.75MHz continuous wave;10mVrms
fc = 42.17MHz continuous wave;10mVrms
10dB
fs = 41.25MHz continuous wave;10mVrms
10dB
(3) Adjust the IF AGC (pin 17) voltage so that the output level at test point A becomes 1.3Vp-p.
(4) Measure the difference between the levels for 3.58MHz and 0.92MHz components at test point A.
C/S beat
0.92MHz
3.58M
4.5M
Frequency (MHz)
Output
(dB)
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