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參數(shù)資料
| 型號(hào)： | LA75695VA |
| 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)： | 10/12頁 |
| 文件大?。?/td> | 281K |
| 代理商： | LA75695VA |
LA75695VA
No.7637-7/13
V6. AGC range [GR]
(1) Apply the VCC voltage to the external AGC, IF AGC (pin 17).
(2) In the same manner as for the V5 (input sensitivity), measure the VIF input level at which the detection output
level becomes Vo -3dB. Vil
(3) GR = Vil–Vi
V7. Maximum allowable input [Vi max]
(1) Internal AGC
(2) fp = 45.75MHz 15kHz 78% AM (VIF input)
(3) VIF input level at which the detection output level at test point A is video output (VO) ±1dB.
V8. No-signal video output voltage [V6]
(1) Apply the VCC voltage to the external AGC, IF AGC (pin 17).
(2) Measure the DC voltage of VIDEO output (A).
V9. Sync. signal tip voltage [V6tip]
(1) Internal AGC
(2) Input a 45.75MHz 10mVrms continuous wave to the VIF input pin.
(3) Measure the DC voltage of VIDEO output (A).
V10. Video output level [VO]
(1) Internal AGC
(2) fp = 45.75MHz 15kHz 78% AM Vi = 10mVrms (VIF input)
(3) Measure the peak value of the detection output level at test point A. (Vp-p)
V11.V12. 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.
V13. 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)
Video portion (Vp-p)
Noise voltage (Vrms)
1.12Vp-p
Noise voltage (Vrms)
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