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参数资料
| 型号： | LA7688B |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP52 |
| 封装： | 0.600 INCH, DIP-52 |
| 文件页数： | 3/20页 |
| 文件大小： | 316K |
| 代理商： | LA7688B |
LA7688B
No.0077-11/20
Continued from preceding page.
Applied voltage (V)
Parameter
Symbol
Test
point
Input
symbol
Test method
TPO-2
TPZ-46
SIF signal level
Sout
TPO-8
SG1
fp = 38.9MHz
cw 80dB
SG2
fp = 33.4MHz
cw 60dB
Mix SG1 and SG2 and enter the mixed
signal to VIF IN.
Connect the spectrum analyzer to
TPO-8 and measure the 5.5MHz level.
VR center
OPEN
[AUDIO SW block]
AF EXT gain
GAF
TPO-51
SG1
fo = 400Hz
Vf = 500mVrms
Apply the DC voltage so that I-1A
becomes EXT.
Enter SG1 from Z-12 and connect the
AC voltmeter to TPO-51.
Measure the 400Hz level and set it as
V51.
GAF = 20log V51/500mVrms
VR center
7.8V
AF EXT distortion
THDAF
TPO-51
SG1
fo = 400Hz
Vf = 500mVrms
Apply the DC voltage so that I-1A
becomes EXT.
Enter SGI from Z-12 and connect a
distortion factor meter to TPO-51.
Measure the distortion factor in this
case.
B.P.F 20Hz to 20kHz
VR center
7.8V
Description of LA7688B chroma block input waveforms
1. The color bar signals which are input from pin 10 and pin 14 are a standard composite video signal.
(1) Color bar : 0dB
Composite video signal with 1Vp-p color bar
(2) Monochrome signal
[PAL]
SYNC : 0.3Vp-p Burst : 300mVp-p Chroma : 600mVp-p
[NTSC] SYNC : 0.3Vp-p Burst : 286mVp-p Chroma : 572mVp-p
(3) Burst only
Signal obtained by eliminating the chroma component from the signal of (2)
(4) 8-division signal
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