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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： | 8/20页 |
| 文件大小： | 316K |
| 代理商： | LA7688B |
LA7688B
No.0077-16/20
OSD block Input signals and test conditions
Set up the following conditions unless otherwise specified for each test item.
(VIF, SIF blocks : No signal)
1. INT IN (pin 10) : No signal
2. EXT IN (pin 14) : Input signal color bar : 0dB (PAL)
3. S-CHROMA IN (pin 13) : DC-sharp + chroma signal
4. SW conditions : EXT VIDEO selected. SW36 shorted (SW36 : ON)
5. VR control position : Contrast VR - 4V, sharpness VR - 2V, others - control center
6. VCC, ICC conditions : VCC = 7.8V, ICC = 12mA
7. The OSD input waveform is such that :
(1) a pulse signal of blanking period 0V and scanning period 0.7V is input
(2) no signal
(3) a 100mVp-p AC sweep (100kHz to 10MHz) of blanking interval 0V and scanning period 0.35V is input
Parameter
Symbol
Test
point
Input
signal
Test method
CONTRAST
BRIGHT VR
BLK IN
[OSD block]
OSD input level
E OSD
O-33
(1)
Measure the DC voltage amplitude.
4V
2.5V
2V
OSD input DC
voltage
V OSD
O-29B
O-30B
O-31B
(2)
Measure the DC voltage.
4V
2.5V
2V
F-BLK input
threshold level
V28TH
O-33
(2)
Raise the voltage at I-28 from 0.5V until
the B output becomes OSD mode.
Measure the voltage at I-28 at that
moment.
4V
2.5V
Variable
OSD output
pedestal
difference
V OSD R
V OSD G
V OSD B
O-35
O-34
O-33
(2)
Measure the R, G, and B's DC voltage.
4V
2.5V
2V
OSD output max
E OSD R1
E OSD G1
E OSD B1
O-35
O-34
O-33
(1)
Measure the R, G, and B's DC voltage
amplitude.
5V
2.5V
2V
OSD output min
E OSD R2
E OSD G2
E OSD B2
O-35
O-34
O-33
(1)
Measure the R, G, and B's DC voltage
amplitude.
0V
2.5V
2V
OSD signal
frequency
characteristics
BW OSD
O-33
(3)
Measure the frequency at which the
output level drops 3dB relative to that
when f = 100kHz is set.
4V
2.5V
2V
TV-OSD crosstalk
(C-Y)
C TTVR
C TTVG
C TTVB
O-35
O-34
O-33
(2)
Measure the R, G, B, AC voltage.
4V
2.5V
2V
OSD-TV crosstalk
(C-Y)
C TOSDR
C TOSDG
C TOSDB
O-35
O-34
O-33
(3)
Measure the R, G, B, AC voltage.
4V
2.5V
0V
OSD CH between
crosstalk (G-Y)
C TOSD
O-34
(3)
Measure the G AC voltage.
4V
2.5V
0V
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