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參數(shù)資料
| 型號： | LA71206M |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | 14 X 14 MM, QFP-80 |
| 文件頁數(shù)： | 28/29頁 |
| 文件大?。?/td> | 436K |
| 代理商： | LA71206M |
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LA71206M
No.7950-8/29
PB Mode Chroma
Ratings
Parameter
Symbol
In
Out
Conditions
min
typ
max
Unit
PB chroma video
output level
NVop-26
T14A
T22A
T26
Mixes the SP mode chroma signal (SP mode, burst
100mVp-p) obtained by converting T14A and NTSC chroma
noise test signal in the low range and the 4MHz, 300mVp-p
sinosoidal wave and enters it to T14 via 3V bias. Enters the
50% white signal (321.5mVp-p) from T22A. Measures the
T26A burst level.
490
580
670 mVp-p
PB chroma pin 46
output level
Vop-46
T14A
T22A
T46
Measure the burst level with the same conditions as those for
NVop-26.
200
mVp-p
PB ACC
characteristics (1)
ACCP1
T14A
T22A
T46
With the conditions used for NVop-26, increase the input
chroma level by +6dB, measure the burst level on T46, and
calculate the ratio with Vop-46.
+0.5
+0.8
dB
PB ACC
characteristics (2)
ACCP2
T14A
T22A
T46
With the conditions used for NVop-26, decrease the input
chroma level by -6dB, measure the burst level on T46, and
calculate the ratio with Vop-46.
-0.5
-0.2
dB
PB killer-on
input level
VACK-P
T14A
T22A
T46
With the conditions used for NVop-26, the input chroma level
until output from T46 cease and measure the input burst level
at that point.
(Calculate the ratio with the standard input 100mVp-p signal)
-25
dB
PB killer-on
chroma output level
VOACK-P
T14A
T22A
T26
Measure the T26 chroma output with a spectrum analyzer in
the killer state of the previous item. Calculate its ratio with
Nvop-26.
-44
-40
dB
PB main converter
carrier leakage
CLP
T14A
T22A
T26
With the conditions used for NVop-26, measure the T26A
with a spectrum analyzer, and calculate the ratio of the
3.58MHz component and the 4.21MHz carrier leakage
component.
-40
-33
dB
Burst de-emphasis
GBD
T14A
T22A
T46
Combine a 629 kHz, 100mVp-p burst, 125mVp-p
chrominance signal with a 4MHz 300mVp-p sine wave and
input that mixture to T14A.
Input a 50% white signal to T22A.
Measure the burst amplitude and chroma amplitude in the
T46 signal. Let B and C be those values, respectively.
GBD = 20LOG(125*B)/(100*C)
-5.25
-5.00
-4.75
dB
PB XO output level
VXO-PN
T50
Measure the output level on T50 with an FET probe.
230
380
600 mVp-p
PB XO oscillator
frequency deviation
fXON
T50
In PB mode, let f be the measured frequency on T50.
Fxon = f-3579545 (Hz)
-7
0
+7
Hz
PB Chroma
2’Fsc distortion
PTHD2
T14A
T22A
T26
With the conditions used for NVOP-26, measure the T26 with
a spectrum analyzer, and calculate the ratio of the 3.58MHz
component and the 7.16MHz component.
PTHD2 = 20 log ( (7.16MHz component)/(3.58MHz
component) )
-25
dB
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