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參數(shù)資料
| 型號： | LA71521M |
| 文件頁數(shù)： | 5/25頁 |
| 文件大小： | 520K |
| 代理商： | LA71521M |
LA71521M
No. 5842-5/25
min
typ
max
[REC mode chroma]
REC chroma
T28A
T14A
215
225
235 mVp-p
low-range converter output level
180
190
200
REC chroma/FM ratio
T28A
T14A
–3.7
–3.0
–2.3
dB
T18
Burst emphasis amount
T28A
T14A
5.5
6.0
6.5
dB
(NTSC mode)
VXO oscillation level
T28A
T56
300
500
700
mVp-p
(PAL mode)
VXO oscillation level
T28A
T56
300
500
700
mVp-p
(NTSC mode)
REC ACC characteristics 1
T28A
T14A
dB
REC ACC characteristics 2
T28A
T14A
–0.5
–0.1
dB
REC ACC
T28A
T14A
–26
dB
Killer input level
REC ACC
T28A
T14A
T14A output level measured with spectrum analyzer and
–60
–50
dB
Killer output level
compared to VOR-14, in killer condition as described
above.
REC ACC
T28A
T14A
–20
dB
Demodulator input level
REC APC
T28A
T14A
Input signal: 50% white signal superimposed with
350
Hz
Pull-in range 1
4.4336 MHz 300 mVp-p CW. After checking that T14A
output is on, CW frequency is raised until T14A output
goes off. Frequency then is gradually reduced.
CW frequency when T14A output goes on: f1
REC APC
T28A
T14A
Same as above, CW frequency is lowered until T14A
–350
Hz
Pull-in range 2
output goes off. Then frequency is gradually raised.
CW frequency when T14A output goes on: f2
300 mVp-p, 15.6 kHz pulse train with 5
μ
s pulse width
is input. Pulse train frequency is raised until T51 output
REC AFC
T28A
T51
kHz
Pull-in range 1
waveform is impaired. Then frequency is lowered.
Pulse train frequency when T51 waveform becomes
normal: f1
REC AFC
T28A
T51
Same as above, pulse train frequency is lowered until T51
–1
kHz
Pull-in range 2
output waveform is impaired. Then frequency is raised.
Pulse train frequency when T51 waveform becomes
normal: f2
BGP delay time
T28
T37
T37 and T60 waveforms are observed with standard color
3.1
3.4
3.7
μ
s
T60
bar input to T28A
BGP width
4.7
4.9
5.1
μ
s
+0.5
Symbol
Parameter
Output
+0.2
+1
Input
Conditions
Unit
Ratings
Continued on next page
V
OR
-14
C/FM
G
BE
V
VXO-RP
V
VXO-RN
ACC
R
1
ACC
R
2
V
ACCK-ON
V
OACCK
V
ACCK-OFF
f
APC
1
f
APC
2
f
AFC
2
f
AFC
1
T14A burst level measured with V
IN
= 1 Vp-p CTL 0
standard color bar signal 1
Down-converted chroma level/FM level ratio with 100%
chroma input
(R
L
: 5.1 k
)
SP/EP and LP T14A burst level ratio with V
IN
= 1Vp-p
standard color bar signal
T56 output amplitude measured with FET probe at
V
IN
= 1 Vp-p standard color bar signal
T56 output amplitude measured with FET probe at
V
IN
= 1 Vp-p standard color bar signal
T14A burst level measured and compared to VOR-14
with V
IN
= 1 Vp-p standard color bar signal and chroma
signal only boosted by +6 dB
T14A burst level measured and compared to VOR-14
with V
IN
= 1 Vp-p standard color bar signal and chroma
signal only boosted by –6 dB
t
D
t
W
T14A input burst level measured when output goes off
and compared to standard input level, with V
IN
= 1 Vp-p
standard color bar signal and chroma signal being
gradually attenuated.
From killer condition as described above, T14A input
burst level is measured when output goes on with input
chroma level being gradually increased. This is
compared to standard input level.
Continued from preceding page
T37
T60
tDtW
A10276
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