la75693m Sanyo Semiconductor Corporation, la75693m Datasheet - Page 6

• Manufacturer Part Number: la75693m
• Description: Pal/ntsc Multi-channel Audio Vif/sif Signal Processing Ic For Tvs And Vcrs
• Manufacturer: Sanyo Semiconductor Corporation

V10. V11 Black noise threshold level and clamp voltage [V BTH , V BCL ]
V12. Video S/N [S/N]
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 15kHz 78% AM10mVrms (VIF input)
(3) Adjust the IF AGC (pin 17) voltage to operate the noise canceller.
(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.
(4) S/N = 20log
(1) Apply DC voltage to the external AGC IF AGC (pin 17) and vary it.
(2) fp = 45.75MHz CW;10mVrms
(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.
fc = 42.17MHz CW;10mVrms - 10dB
fs = 41.25MHz CW;10mVrms - 10dB
Measure the V BTH , V BCL at test point A.
…… Noise voltage (N)
Noise voltage (Vrms)
Video position (Vp-p)
Video output
Output
(dB)
(V)
= 20log
0.92MHz
LA75693M
Noise voltage
1.12Vp-p
Frequency (MHz)
V BCL
C/S beat
3.58M 4.5M
Time
(dB)
V BTH
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