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参数资料
| 型号： | LA71730EM |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封装： | 14 X 20 MM, QFP-100 |
| 文件页数： | 18/19页 |
| 文件大小： | 819K |
| 代理商： | LA71730EM |
LA71730EM
No.7951-8/47
Continued from preceding page.
Input signal
Input/Output point
Ratings
Parameter
Symbol
Signal
Level
In
Out
Conditions
min
typ
max
Unit
REC ACC killer-on
input level
VACCK-
ON
SG3
(PAL)
A : 300
B : 700
C : 700
T48A
T21
With the 100% chroma signal, decrease only
the burst signal until the T21 output ceases,
and measure the input burst level at the time.
Calculate the ratio of this value with the
standard input level.
-26
dB
REC ACC killer-on
output level
VOACCK
SG3
(PAL)
A : 300
B : 700
C : 700
T48A
T21
Measure the T21 output level with a spectrum
analyzer in the killer state of the above item,
and calculate its ratio with PRC.
-60
-50
dB
REC ACC killer
restored input level
VACCK-
OFF
SG3
(PAL)
A : 300
B : 700
C : 700
T48A
T21
From the killer state of the above item,
gradually increase the burst signal until the T21
output reappears, and measure the input burst
level at the time. Calculate its ratio with the
standard input level.
-20
dB
REC APC pull-in
range (1)
PAL
APC1
SG1
+
SG5
A : 300
B : 700
300
T48A
T21
Input a signal consisting of a 4.4336MHz CW
added to a 50% white signal. After confirming
that a signal is output from T21, increase the
CW frequency until T21 output ceases. Now
slowly reduce the CW frequency, and let f1 be
the frequency at which the T21 output
reappears.
fAPC1 = f1 - 4433619 (Hz)
350
Hz
REC APC pull-in
range (2)
PAL
APC2
SG1
+
SG5
4.433619
A : 300
B : 700
300
T48A
T21
As in the previous item, decrease the CW
frequency until T21 output ceases. Now slowly
increase the CW frequency and let f2 be the
frequency at which the T21 output reappears.
fAPC2 = f2 - 4433619 (Hz)
-350
Hz
VXO2 oscillation level
PAL
PVXO2
SG3
(PAL)
A : 300
B : 700
C : 700
D : 300
T48A
T29
With the 100% chroma signal, measure the
T29 output level with an FET probe.
300
450
700
mVp-p
REC output burst
level
NTSC SP
NRBSP
SG3
(NT)
A : 286
B : 714
C : 714
D : 286
T48A
T21
With the 100% chroma signal, measure the
burst level on T21.
390
440
490
mVp-p
Burst emphasis
NTSC SP
GBENSP
SG3
(NT)
A : 286
B : 714
C : 714
D : 286
T48A
T21
With the 100% chroma signal, calculate the
ratio of the T21 burst levels for SP/EP and LP
modes.
5.5
6
6.5
dB
REC APC pull-in
range (1)
NTSC
NAPC1
SG1
+
SG5
A : 286
B : 714
300
T48A
T21
Input a signal consisting of a 3.5795MHz CW
added to a 50% white signal. After confirming
that a signal is output from T21, increase the
CW frequency until T21 output ceases. Now
slowly reduce the CW frequency, and let f1 be
the frequency at which the T21 output
reappears.
fAPC1 = f1 - 3579545 (Hz)
350
Hz
REC APC pull-in
range (2)
NTSC
NAPC2
SG1
+
SG5
A : 286
B : 714
300
T48A
T21
As in the previous item, decrease the CW
frequency until T21 output ceases. Now slowly
increase the CW frequency and let f2 be the
frequency at which the T21 output reappears.
fAPC2 = f2 - 3579545 (Hz)
-350
Hz
VXO oscillation level
NTSC
NVXO1
SG3
(NT)
A : 286
B : 714
C : 714
D : 286
T48A
T31
With the 100% chroma signal, measure the
T31 output level with an FET probe.
300
450
700
mVp-p
The ratio of the REC
chroma level and FM
modulator output
level.
PAL
YCRP
SG3
(PAL)
A : 300
B : 700
C : 700
D : 300
T48A
T21
T78
The ratio of 100% chroma level which was
converted to low band and FM modulator
output level
* Serial Gr5 : ****-**00, Gr6 : ****-**01
-1.8
-3.1
-4.4
dB
Continued on next page.
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