- 您现在的位置：买卖IC网 > PDF目录30725 > LA7688B AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP52 PDF资料下载
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： | 6/20页 |
| 文件大小： | 316K |
| 代理商： | LA7688B |
LA7688B
No.0077-14/20
Continued from preceding page.
Parameter
Symbol
Test
point
Input
signal
Test method
COLOR VR
CONTRAST
TINT VR
B/RP
O-33
O-35
(4)
Calculate the ratio between output
amplitude BM corresponding to 0
degrees and 180 degrees of the chroma
input in the B output and output amplitude
RM corresponding to 90 dgrees and 270
degrees of the chroma input in the R
output.
2.5V
4V
0V
G/RP
O-34
O-35
(4)
Measure the output amplitude
corresponding to 90 degrees and 270
degrees of the chroma input in the G
output and calculate the ratio to the above
RM.
2.5V
4V
0V
Demodulator
output ratio
G/BP
O-33
O-34
(4)
Measure the output amplitude
corresponding to 0 dgrees and 180
degrees of the chroma input in the G
output and calculate the ratio to the above
BM.
2.5V
4V
0V
Demodulation
angle
∠RBP
O-33
O-35
(4)
Take Ba and Bb as the output amplitudes
corresponding to the first and the third of
the chroma 8-division signal inputs in the
B output respectively and calculate by
using the following formula. For the R
output also, calculate with Ra and Rb.
)
/
(
)
/
(
1
Ra
Rb
Tan
Ba
Bb
Tan
+
2.5V
4V
0V
[Chroma block NTSC]
ACC1n
O-33
(1)
0dB/6dB
Adjust the relative phase of the SG's
chroma and burst so that the B output
assumes a horizntal waveform. And then
measure the B output's Vp-p value.
After changing the input signal level from
0dB to 6dB, adjust the relative phase of
the SG's chroma and burst again when
the B-Y output assumes a horizontal
waveform ; that adjusted phase amount is
PCC1n. Measure the B output's Vp-p at
that moment and calculate the ratio in dB
to the B output's Vp-p when the input
signal level is 0dB ; that ratio is ACC1n.
2.5V
4V
3V
ACC amplitude
characteristics 1/2
ACC2n
O-33
(1)
-20dB
In the same manner as above, measure
the variations of the amplitude and phase
when the input signal level is changed
from 0dB to -20dB.
2.5V
4V
3V
PCC1n
O-33
(1)
0dB/6dB
Same as for ACC1.
2.5V
4V
3V
ACC phase
characteristics 1/2
PCC2n
O-33
(1)
-20dB
Same as for ACC2.
2.5V
4V
3V
Killer operating
point
EKILn
O-33
(1) : Level
variable
Attenuate the input signal level from 0dB
until there comes a point where the B
output ceases ; that point is the killer
operating point.
2.5V
4V
3V
Killer hysteresis
DEKILn
O-33
(1) : Level
variable
Measure the difference between killer-on
level and killer-off level.
2.5V
4V
3V
RGB output level
EBn
O-33
(1)
Y-OFF
chroma
50%
Adjust the SG so that the B output
assumes a horizontal waveform and
measure the Vp-p value of the B output's
signal component.
BRIGHT : 5V
2.5V
4V
3V
Continued on next page.
相关PDF资料 |
PDF描述 |
|---|---|
| LA7688 | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP52 |
| LA76919M | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| LA76931K | SPECIALTY CONSUMER CIRCUIT, PDIP64 |
| LA76931K | SPECIALTY CONSUMER CIRCUIT, PDIP64 |
| LA76938Y | SPECIALTY CONSUMER CIRCUIT, PDIP64 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LA76922M | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Signal-Processing IC with Integrated Microcontroller |
| LA76930 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:LA76930 |
| LA76931J7FB-E | 制造商:ON Semiconductor 功能描述:SIGNAL PROCESSING FOR CRT - Ammo Pack 制造商:ON Semiconductor 功能描述:FNFLD / SIGNAL PROCESSING FOR CRT |
| LA76931K7N5BD3-E | 制造商:Sony Semiconductor Solutions Division 功能描述: |
| LA76936Y7FB-E | 制造商:ON Semiconductor 功能描述:SIGNAL PROCESSING FOR CRT - Ammo Pack |
发布紧急采购，3分钟左右您将得到回复。