參數(shù)資料
型號： LA7191N
廠商： Sanyo Electric Co.,Ltd.
英文描述： Global VHS-format VCR Video Signal Processor
中文描述： 全球錄影帶格式錄像機(jī)視頻信號處理器
文件頁數(shù)： 6/11頁
文件大?。?/td> 146K
代理商： LA7191N
Continued from preceding page.
Parameter
Symbol
f
AFC1
Input
Output
T37A
Conditions
min
1.0
typ
7.0
max
Unit
kHz
REC AFC pull-in range
T24
Input a string of pulses (negative polarity) at
300 mV, 15.6 kHz with a width of 5 μs. After
increasing the frequency of the pulse string
until the waveform at pin 24 is disrupted,
then reduce the frequency until the waveform
at pin 24 is normal again; that pulse string
frequency is f
1
.
f
AFC1
= f
1
– 15.625 (kHz)
f
AFC2
T37A
T24
In the same manner, after reducing the
frequency of the pulse string until the
waveform at pin 24 is disrupted, then
increase the frequency until the waveform at
pin 24 is normal again; that pulse string
frequency is f
2
.
f
AFC2
= f
2
– 15.625 (kHz)
–3.7
–1.0
kHz
[PB Mode Chroma]
PB chroma video output
level
Vop-34
T39A
T15A
T4A
T34A In PB, SP mode, input a 4 MHz: 300 mVp-p
continuous wave at T39A, and from T15A
input a chroma signal (SP mode, burst 50
mVp-p) that underwent low-band conversion
from a chroma noise test signal.
Input a 50% white signal from T4A and
measure the T34A burst level
T31
Measure the T31 burst level under the same
conditions as for Vop-34.
240
300
360 mVp-p
PB chroma pin 31 output
level
Vop-31
T39A
T15A
T4A
T39A
T15A
T4A
220
270
320 mVp-p
PB ACC characteristics
ACC
P1
T31
Input the input chroma level at +6 dB under
the same conditions as for Vop-34 and
measure the T31 burst level, and calculate
the ratio with Vop-31.
Input the input chroma level at –6 dB under
the same conditions as for Vop-34 and
measure the T31 burst level, and calculate
the ratio with Vop-31.
Lower the input chroma level under the same
conditions as for Vop-34 and measure the
input burst level at the point where T31
chroma output ceases. (Calculate ratio with
standard input of 50 mVp-p)
T34A Use a spectrum analyzer to measure the T34
chroma output level in the killer state
described previously. Calculate ratio with
Vop-34.
T34A Monitor T34A with a spectrum analyzer under
the same conditions as for Vop-34 and
calculate the ratio between the 4.43 MHz
component and the 5.06 MHz carrier leak
component.
T31
From T39A, input a 4 MHz 300 mVp-p
continuous wave; from T4A, input a 50%
white signal, and calculate the ratio between
the output level during the T31 burst interval
and the output level during other intervals.
T19
Measure the PB mode T19 output level with
an FET probe
T19A Measure the frequency at T19A during PB
mode...f
f
XO
= f – 4433619 (Hz)
0.5
0.8
dB
ACC
P2
T39A
T15A
T4A
T31
–0.5
–0.2
dB
PB killer input level
V
ACK-P
T39A
T15A
T4A
T31
–40
–32
–25
dB
PB killer chroma output
level
V
OACK-P
T39A
T15A
T4A
–44
–40
dB
PB main converter carrier
leak
C
LP
T39A
T14A
T4A
–40
–33
dB
Burst de-emphasis amount
(NTSC mode)
GBD
T39A
T4A
T27A
–4.40 –4.65 –4.90
dB
PB XO output level
V
XO-P
480
610
750
mVp-p
PB XO oscillation frequency
variation
f
XO
–9
0
+9
Hz
Continued on next page.
LA7191N
No. 5471 - 6/11
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