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参数资料
| 型号： | LA7688 |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP52 |
| 封装： | SHRINK, DIP-52 |
| 文件页数： | 3/6页 |
| 文件大小： | 106K |
| 代理商： | LA7688 |
No. 5635-3/6
LA7688
Continued from preceding page.
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
[Filter Block]
Filter automatic adjustment open voltage
V9OPN
fSC = 4.43 MHz
3.3
3.8
4.3
V
S input threshold
V9TH
1.5
2.0
2.5
V
C-TRAP
GTRAP
–20
–26
–32
dB
C-BPF1
GBPF1
–5
–3
–1
dB
C-BPF2
GBPF2
–2
–1
0
dB
C-BPF3
GBPF3
–6
–4
–2
dB
Y-DL TIME1
Tdy1
PAL
400
450
500
ns
Y-DL TIME2
Tdy2
NTSC
410
460
510
ns
Y-DL TIME3
Tdy3
S (PAL)
230
280
330
ns
Y-DL TIME4
Tdy4
SECAM
510
560
610
ns
[Video Block]
Contrast center
ECCEN
1.0
1.2
1.4
Vp-p
Contrast variation range
dGC
18
22
26
dB
Brightness minimum (0.5 V)
VB min
0.4
0.7
1.0
V
Brightness typical (2.5 V)
VB typ
1.9
2.2
2.5
V
Brightness maximum (4.5 V)
VB max
3.4
3.7
4.0
V
Soft control characteristics
dGSOFT
–6.0
–4.0
–2.0
dB
Sharp control characteristics
dGSHARP
4.5
7.5
10.5
dB
Y signal frequency characteristics (1)
BW1
S-VHS
3.9
4.4
4.9
MHz
Y signal frequency characteristics (2)
BW2
PAL
3.0
3.35
3.7
MHz
Y signal frequency characteristics (3)
BW3
NTSC
2.5
2.85
3.2
MHz
DC transmission ratio
dVAPL
100
%
Black expansion threshold
BSTH
40
50
60
IRE
Black expansion maximum gain
BSmax
–20
–13
–6
IRE
[Chrominance Common]
R-Y output DC voltage
V39DC
3.6
4.0
4.4
V
R-Y output AC voltage
E39AC
0.45
0.60
0.75
Vp-p
B-Y output DC voltage
V38DC
3.6
4.0
4.4
V
B-Y output AC voltage
E38AC
0.35
0.5
0.65
Vp-p
R-Y input DC voltage
V37DC
4.2
4.6
5.0
V
R-Y input AC voltage
E37AC
0.45
0.60
0.75
Vp-p
R-Y input AC range
E37ALC
160
200
250
mVp-p
B-Y input DC voltage
V36DC
4.2
4.6
5.0
V
B-Y input AC voltage
E36AC
0.35
0.5
0.65
Vp-p
B-Y input AC range
E36ALC
160
200
250
mVp-p
Residual color
ECMIN
200
mVp-p
Contrast color amplitude characteristics
dGCC
30
35
40
dB
RGB output DC difference voltage
dVC
With no chrominance signal input
–0.3
0
+0.3
V
RGB output DC voltage temperature
VC/T
With no chrominance signal input
0
mV/°C
characteristics
RGB output residual high-frequency level
E car
0.2
Vp-p
RGB output residual carrier level
e car
With no chrominance signal input
0.3
Vp-p
fSC output pin DC voltage
V27OPN
4.5
5.0
5.3
V
fSC output level P
V27ACP
PAL
0.14
0.2
0.26
Vp-p
fSC output level N
V27ACN
NTSC
0.19
0.26
0.33
Vp-p
DEF COIN-L
V27LO
1.0
1.3
1.6
V
Crystal switching threshold
V27TH
400
A
PAL switching threshold
V18PTH
0.6
V
NT switching threshold
V18NTH
0.9
V
Continued from preceding page.
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