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LA75676V 데이터시트(PDF) 6 Page - Sanyo Semicon Device |
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LA75676V 데이터시트(HTML) 6 Page - Sanyo Semicon Device |
6 / 9 page 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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