參數(shù)資料
型號: LA75695VA
廠商: SANYO SEMICONDUCTOR CO LTD
元件分類: 接收器
英文描述: AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24
封裝: 0.225 INCH, SSOP-24
文件頁數(shù): 11/12頁
文件大?。?/td> 281K
代理商: LA75695VA
LA75695VA
No.7637-8/13
V14. 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 DC level at test point A becomes 2.4V.
(4) Measure the difference between the levels for 3.58MHz and 0.92MHz components at test point A.
V15. Frequency characteristics [fc]
(1) Apply DC voltage to the external AGC IF AGC (pin 17) and adjust the voltage.
(2) SG1 : 45.75MHz continuous wave 10mVrms
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.
(3) First set the SG2 frequency to 45.65MHz, and then adjust the IF AGC voltage (V17) so that the output level at
test point A becomes 0.5Vp-p. V1
(4) Set the SG2 frequency to 39.75MHz and measure the output level. V2
(5) Calculate as follows :
fc = 20log
(dB)
V16.V17. Differential gain, differential phase [DG, DP]
(1) Internal AGC
(2) fp = 45.75MHz APL50% 87.5% modulation video signal Vi = 10mVrms
(3) Measure the DG and DP at test point A.
V18. No-signal AFT voltage [V13]
(1) Internal AGC
(2) Measure the DC voltage at the AFT output (B).
V2
V1
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