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參數資料
| 型號： | LA7567EV |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封裝： | 0.275 INCH, SSOP-24 |
| 文件頁數： | 18/21頁 |
| 文件大小： | 208K |
| 代理商： | LA7567EV |
Test Conditions
V1. Circuit current . . . . . . . . . . . . [I5]
(1) Internal AGC
(2) Input a 38.9MHz 10mVrms continuous wave to the VIF input pin.
(3) RF AGC Vr MAX
(4) Connect an ammeter to the VCC and measure the incoming current.
V2.V3. Maximum RF AGC voltage, Minimum RF AGC voltage . . . . . . [V14H, V14L]
(1) Internal AGC
(2) Input a 38.9MHz 10mVrms continuous wave to the VIF input pin.
(3) Adjust the RF AGC Vr (resistor value max.) and measure the maximum RF AGC voltage. (F)
(4) Adjust the RF AGC Vr (resistor value min.) and measure the minimum RF AGC voltage. (F)
V4. Input sensitivity. . . . . . . . . . . . . . . . . . . . . . . . [Vi]
(1) Internal AGC
(2) fp = 38.9MHz 400Hz 40% AM (VIF input)
(3) Turn off the S1 and put 100k
through.
(4) VIF input level at which the 400Hz detection output level at test point A becomes 0.64Vp-p.
V5. AGC range . . . . . . . . . . . . . . . . . . . . . . . . . . . . [GR]
(1) Apply the VCC voltage to the external AGC IF AGC (pin 17).
(2) In the same manner as for the V4 (input sensitivity),measure the VIF input level at which the detection output
level becomes 0.64Vp-p .............Vi1.
(3)
V6. Maximum allowable input. . . . . . . . . . . . . . . . [VI max]
(1) Internal AGC
(2) fp = 38.9MHz 15kHz 78% AM (VIF input)
(3) VIF input level at which the detection output level at test point A is video output (Vo)
±1dB
V7. 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).
V8. Sync. signal tip voltage . . . . . . . . . . . . . . . . . [V6tip]
(1) Internal AGC
(2) Input a 38.9MHz 10mVrms continuous wave to the VIF input pin.
(3) Measure the DC voltage of VIDEO output (A).
V9. Video output level . . . . . . . . . . . . . . . . . . . . . . [VO]
(1) Internal AGC
(2) fp = 38.9MHz 15kHz 78% AM Vi = 10mVrms (VIF input)
(3) Measure the peak value of the detection output level at test point A. . . . . . . . Vp-p
No.7779-6/21
LA7567EV
dB
Vi
Vi1
20log
GR =
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