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LA75676V 데이터시트(PDF) 6 Page - Sanyo Semicon Device

부품명 LA75676V
상세설명  For TV and VCR Products IF Signal Processor (VIFSIF)
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제조업체  SANYO [Sanyo Semicon Device]
홈페이지  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LA75676V 데이터시트(HTML) 6 Page - Sanyo Semicon Device

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LA75676V
No.A0831-6/9
V10, V11. Black noise threshold and clamp voltages • • • • [VBTH, VBCL]
1. Apply a DC voltage to the external AGC IF input (pin 17) and vary that voltage.
2. fp = 45.75MHz, 400Hz, 40% AM, 10mVrms (VIF input)
3. Vary the IF AGC (pin 17) voltage so that the noise canceller operates.
Measure VBTH and VBCL at test point A.
V12. Video signal-to-noise ratio • • • • [S/N]
1. Internal AGC
2. fp = 45.75MHz, CW, 10mVrms (VIF input)
3. Measure the noise voltage as an RMS level at test point A after passing through a 10kHz to 4MHz bandpass filter.
This is the noise voltage (N).
4. S/N = 20log
Video component (Vp-p)
Noise voltage (Vrms)
= 20log
1.12Vp-p
Noise voltage
= (dB)
V13. C/S beating • • • • [ICS]
1. Apply a DC voltage to the external AGC IF input (pin 17) and vary that voltage.
2. fp = 45.75MHz, CW ; 10mVrms
fc = 42.17MHz, CW ; 10mVrms - 10dB
fs = 41.25MHz, CW ; 10mVrms - 10dB
3. Vary the IF AGC (pin 17) voltage to adjust the output level at test point A to be 1.3Vp-p.
4. Measure the difference in level between the 3.58MHz and the 0.92MHz components at test point A.
VBCL
VBTH
Time
Video output
(V)
C/S beating
0.92MHz
3.58M 4.5M
Frequency (MHz)
Output
(dB)


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