la75693m Sanyo Semiconductor Corporation, la75693m Datasheet - Page 7

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

V14. Frequency characteristics [fc]
V15. V16. Differential gain, differential phase [DG, DP]
V17. No-signal AFT voltage [V 13 ]
V18.V19.V20 Maximum minimum AFT output voltage, AFT detection sensitivity [V 13 H, V 13 L, Sf]
(1) Apply DC voltage to the external AGC IF AGC (pin 17) and vary it.
(2) SG1:45.75MHz continuous wave 10mVrms
(3) First set the SG2 frequency to 45.65MHz, and then adjust the IF AGC voltage (V 17 ) so that the output level at test
(4) Set the SG2 frequency to 39.75MHz and measure the output level. …… V2
(5) Calculate as follows:
(1) Internal AGC
(2) fp = 45.75MHz APL50% 87.5% modulation video signal V i = 10mVrms
(3) Measure the DG and DP at test point A
(1) Internal AGC
(2) Measure the DC voltage at the AFT output (B).
(1) Internal AGC
(2) fp = 45.75MHz ± 1.5MHz Sweep = 10mVrms (VIF input)
(3) Maximum voltage …… V 13 H, minimum voltage …… V 13 L
(4) Measure the frequency deviation at which the voltage at test point B changes from V1 to V2 …… ∆ f
SG2:45.65MHz to 39.75MHz continuous wave 2mVrms
Add the SG1 and SG2 signals using a T pat and adjust each SG signal level so that the above-mentioned levels are
reached and input the added signals to the VIF IN.
point A becomes 0.5Vp-p. …… V1
Sf
=
2000
∆
AFT output
fc =
( f
kHz
(
(V)
mV
20
)
log
)
mV
V
V
/
2
1
kHz
(
dB
)
V 13 H
LA75693M
IF frequency (MHz)
∆f
V1;3.5V
V2;1.5V
V 13 L
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