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參數資料
| 型號： | LA71578HM |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | 14 X 20 MM, QIP-100 |
| 文件頁數： | 41/43頁 |
| 文件大小： | 1533K |
| 代理商： | LA71578HM |
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LA71598HM
No.A0643-7/44
Continued from preceding page.
Ratings
Parameter
Symbol
In
Out
Conditions
min
typ
max
Unit
NTSC
→ PAL
conversion
Ratio of the Burst level
ΔB-NAP
T1A
T10A
T27
With the same condition above, measure the Burst
level, and take the ratio with VBNAP.
-2
0
2
dB
PB Chroma 2nd
harmonic distortion
PTHD2
T1A
T10A
T27
With the conditions used for PVOP-27, measure the
T27 with a spectrum analyzer, and calculate the ratio
of the 4.43MHz component and the 8.86MHz
component.
-25
dB
REC Mode Chroma
Ratings
Parameter
Symbol
In
Out
Conditions
min
typ
max
Unit
REC chroma low
frequency conversion
output level
VOR-72
T38A
T72
With VIN the standard color bar signal
(1Vp-p), measure the burst level on T72.
Serial
00
01
10
11
225
190
160
135
mVp-p
VXO oscillation level
PAL GBI
VVXO-RP
T38A
T69A
With VIN the standard color bar signal (1Vp-p),
measure the T69A output amplitude with an FET
probe.
300
500
700
mVp-p
REC ACC
Characteristics (1)
ACCR1
T38A
T72
With VIN the standard color bar signal (1Vp-p),
increase only the chroma signal level by +6dB,
measure the T72 burst level, and calculate its ratio
with VOR-2.
+0.2
+0.5
dB
REC ACC
characteristics (2)
ACCR2
T38A
T72
With VIN the standard color bar signal (1Vp-p),
decrease only the chroma signal level by -6dB,
measure the T72 burst level, and calculate its ratio
with VOR-2.
-0.5
-0.1
dB
REC ACC killer-on
input level
VACCK-ON
T38A
T72
With VIN the standard color bar signal (1Vp-p),
decrease the chroma signal and measure the input
burst level at the point that T72 output ceases.
Calculate the ratio of this value with the standard
input level.
-26
dB
REC ACC killer-on
output level
VOACCK
T38A
T72
Measure the T72 output level with a spectrum
analyzer in the killer state of the above item and
calculate its ratio with VOR-2.
-60
-50
dB
REC ACC killer
restored input level
VACCK-OFF
T38A
T72
From the killer state of the above item gradually
increase the input chroma level and T72 output
reappears.
Calculate its ratio with the standard input level.
-20
dB
REC APC pull-in
range (1)
PAL MODE
ΔfAPC1
T38A
T72
Input a signal consisting of a 4.4336MHz CW added
to a 50% white signal. After confirming that a signal is
output from T72, increase the CW frequency until T72
output ceases.
Now slowly reduce the CW frequency, and let f1 be
the frequency at which T72 output reappears.
ΔfAPC1 = f1-4433619 (Hz)
300
Hz
REC APC pull-in
range (2)
PAL MODE
ΔfAPC2
T38A
T72
As in the previous item, decrease the CW frequency
until T72 output ceases.
Now, slowly increase the CW frequency and let f2 be
the frequency at which T72 output reappears.
ΔfAPC2 = f2-4433619 (Hz)
-300
Hz
REC AFC pull-in
range (1)
ΔfAFC1
T38A
T62
Input a 300mVp-p, 15.6kHz, 5
μs width pulse train
(negative polarity).
After increasing the pulse train frequency until the
T62 wave form is disrupted, decrease the frequency
until the T62 wave form returns to normal and let f1 be
that frequency.
ΔfAFC1 = f1-15.625 (kHz)
1.0
kHz
Continued on next page.
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