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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： | 5/20页 |
| 文件大小： | 316K |
| 代理商： | LA7688B |
LA7688B
No.0077-13/20
Parameter
Symbol
Test
point
Input
signal
Test method
COLOR VR
CONTRAST
TINT VR
RGB output DC
difference voltage
DVC
O-33
O-34
O-35
(3)
Obtain the DC difference voltage of each
output measured for Parameter "RGB
difference output DC voltage".
2.5V
4V
0V
RGB output
residual harmonic
level
Ecar2
O-33
O-34
O-35
(3)
Measure the residual harmonic level for
the scanning period each of RGB
difference outputs.
(SHARP : 0V)
2.5V
4V
0V
RGB output carrier
leak
Ecar
O-33
O-34
O-35
(2)
Measure the residual carrier level for the
scanning period each of RGB difference
outputs.
(SHARP : 0V)
2.5V
4V
0V
fsc output pin DC
voltage
V27OPN
Z-27B
(3)
Measure the DC voltage.
2.5V
4V
0V
fsc output level P
V27ACP
Z-27A
(3)
Measure the AC voltage.
2.5V
4V
0V
fsc output level N
V27ACN
Z-27A
(3)
Measure the AC voltage.
2.5V
4V
3V
DEF COIN-L
V27LO
Z-27B
No signal
Measure the DC voltage.
2.5V
4V
0V
Xtal SW threshold
V27A
Z-27A
No signal
Measure the frequency voltage.
2.5V
4V
0V
PAL SW threshold
V18PTH
O-35
(1) PAL
Measure the AC voltage.
2.5V
4V
0.6V
NT SW threshold
V18NTH
O-35
(1) NT
Measure the AC voltage.
2.5V
4V
0.9V
[Chroma block PAL]
ACC1p
O-33
(1)
0dB/6dB
Measure the output's Vp-p value.
After chaning the input signal level from
0dB to 6dB, measure the B output's Vp-p
value and calculate the ratio in dB to the B
output's Vp-p value when the input signal
level is 0dB.
2.5V
4V
0V
ACC amplitude
characteristics
ACC2p
O-33
(1)
-20dB
In the same manner, obtain the amplitude
variations when the input signal level is
changed from 0dB to -20dB.
2.5V
4V
0V
Killer operating
point
EKILp
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
0V
Killer hyesteresis
DEKILp
O-33
(1) : Level
variable
Measure the difference between killer-on
level and killer-off level.
2.5V
4V
0V
RGB output level
Ebp
O-33
(1) Y-OFF
Chroma
50%
Measure the Vp-p value of the B output’s
signal component.
BRIGHT : 5V
2.5V
4V
0V
Maximum RGB
output
EBMAXp
O-33
(1) Y-OFF
Chroma
50%
Measure the Vp-p value of the B output’s
output amplitude.
BRIGHT : 5V
5V
4V
0V
APC pull-in range
Dfscp+
Dfscp-
O-27A
(1) fsc
frequency
variable
Vary the subcarrier frequency to measure
the pull-in frequency and calculate the
difference from fsc.
2.5V
4V
0V
Continued on next page.
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