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LA75694M Datasheet(PDF) 6 Page - Sanyo Semicon Device |
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LA75694M Datasheet(HTML) 6 Page - Sanyo Semicon Device |
6 / 10 page LA75694M No.A0251-6/10 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) S/N = 20log = 20log (dB) V13. C/S beat [IC-S] (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 for 3.58MHz and 0.92MHz components at test point A. Video portion (Vp-p) Noise voltage (Vrms) 1.12Vp-p Noise voltage (Vrms) |
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