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参数资料
| 型号： | LA71750EM |
| 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： | 3/46页 |
| 文件大小： | 898K |
| 代理商： | LA71750EM |
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LA71750EM
No.7952-11/46
Continued from preceding page.
Input signal
Input/Output point
Ratings
Parameter
Symbol
Signal
Level
In
Out
Conditions
min
typ
max
Unit
Envelope detection
output terminal voltage
SP2
VENSP2
SG5
f=4MHz
mVp-p
T96A
T84
When input f = 4MHz, T84 1.0Vp-p,
DC diff to venv, for T82A output level.
0
3.8
4.3
4.8
V
Envelope detection
output terminal voltage
EP1
VENEP1
SG5
f=4MHz
mVp-p
T90A
T84
When input f = 4MHz, T84 200mVp-p,
DC diff to venv, for T82A output level.
0
5.0
2.0
2.5
3.0
V
Envelope detection
output terminal voltage
EP2
VENEP2
SG5
f=4MHz
mVp-p
T90A
T84
When input f = 4MHz, T84 600mVp-p,
DC diff to venv, for T82A output level.
0
5.0
4.0
4.5
5.0
V
Comparator output
voltage 1
VCOMP1
SG5
f=4MHz
38mVp-p T96A
T83
T83 DC voltage when VIN = 38mVp-p,
f = 4MHz.
0
0.4
0.9
V
Comparator output
voltage 2
VCOMP2
SG5
f=4MHz
38mVp-p T90A
T83
T83 DC voltage when VIN = 38mVp-p,
f = 4MHz.
5.0
0
4.5
4.8
V
When measuring PB Mode of H.A, a video signal (0.5Vp-p) is input to T74A because HA-SW (EP/SP) change in
LA71750EM is making rising of H-SYNC synchronous.
Input signal
Input/Output point
Ratings
Parameter
Symbol
Signal
Level
In
Out
Conditions
min
typ
max
Unit
Recording mode
T11B
HA
REC AGC Amp output
current
VRSP
VREP
SG5
f=4MHz
300mVp-p T78A
T95A
T89A
Output level when VIN = 300mVp-p,
f = 4MHz
0
5.0
12.7
13.5
14.3
mAp-p
Difference of gain
between modes
ΔVR
VRSP/VREP
0
5.0
-0.5
0.0
0.5
dB
REC AGC AMP
control characteristics
1
ΔVAGC1
-SP
ΔVAGC1
-EP
SG5
f=4MHz
700mVp-p T78A
T95A
T89A
As f = 4MHz, the output level/VRSP,
EP
When VIN = 600mVp-p.
0
5.0
0.5
1.0
dB
REC AGC AMP
control characteristics
2
ΔVAGC2
-SP
ΔVAGC2
-EP
SG5
f=4MHz
100mVp-p T78A
T95A
T89A
As f = 4MHz, the output level/VRSP,
EP
When VIN = 100mVp-p.
0
5.0
-1.0
-0.5
dB
REC AGC AMP
Frequency
characteristics
ΔVFRS
ΔVFRE
SG5
f=7MHz
f=1MHz
300mVp-p T78A
T95A
T89A
As VIN = 300mVp-p, the output ratio
when f is 1M, 7MHz 7MHz/1MHz
(Note 1)
0
5.0
0.0
1.0
2.0
dB
Rec AGC Amp
attenuate volume
of mute
ΔVHRS
ΔVHRE
SG5
f=4MHz
300mVp-p T78A
T95A
T89A
Output level/VRSP, EP
When VIN = 300mVp-p, f = 4MHz
Via pin 30
0
5.0
-45
dB
REC AGC AMP
second harmonic
distortion
ΔVHDRE
SG5
f=4MHz
300mVp-p T78A
T95A
T89A
The ratio of the 8M
(second component) VIN = 300mVp-p,
f = 4MHz output and 4M
(first component).
0
5.0
-40
-35
dB
REC AGC AMP
maximum output level
ΔVHDRS
ΔVHDRE
SG5
f=4MHz
T78A
T95A
T89A
The output level which become -30dB
of f = 4MHz second distortion.
0
5.0
20
mAp-p
REC AGC AMP
Mixed modulation
relative level
ΔVCYS
ΔVCYE
SG5
f=4MHz
T78A
T21A
T95A
T89A
T78A : VIN = 300mVp-p, f = 4MHz,
T21A : VIN = 1.5Vp-p, f = 629kHz
(4M±629K) /4M ratio of output.
0
5.0
-40
-35
dB
Continued on next page.
Similarly to the case of the PB mode, HA-SW (EP/SP) changeover is synchronized to rise of H-SYNC in the REC mode.
Before changeover, Check by applying the video signal (1Vp-p) to T48A.
(Note1) Apply about 1.8 DC volt to the AGC detection filter pin (pin 86) to fix AGC-AMP-GAIN
Note 1. To measure REC-AGC-AMP, C-sync must be fixed to HIGH. Connect T47, T49, T52, T54, and T57 of the
VIDEO input pin to ground in the REC mode
2. Use a resistor of pin 85 to ground with the accuracy of
±1.0%
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