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参数资料
| 型号： | LA7688B |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP52 |
| 封装： | 0.600 INCH, DIP-52 |
| 文件页数： | 12/20页 |
| 文件大小： | 316K |
| 代理商： | LA7688B |
LA7688B
No.0077-2/20
Electrical Characteristics at Ta = 25
°C, VCC 40, 45 = 7.8V, I24 = 12mA
Ratings
Parameter
Symbol
Conditions
min
typ
max
Unit
[Circuit voltage current]
Horizontal supply voltage
VCC H
Deflection block (V24)
6.4
6.9
7.4
V
I40
78
90
100
mA
Supply current
I45
34
40
48
mA
[VIF block]
RF AGC voltage max
V50H
7.5
7.8
V
RF AGC voltage min
V50L
0.2
0.6
V
Input sensitivity
VI
39
45
dB
AGC range
GR
56
60
dB
Maximum allowable input
VI max
95
100
dB
No-signal video output voltage
V8
4.1
4.4
4.7
V
Sync signal tip voltage
V8tip
1.7
2.0
2.3
V
Video output amplitude
VO
1.7
2.0
2.3
Vp-p
Black noise threshold level voltage
VBTH
1.0
1.3
1.7
V
Black noise clamp voltage
VBCL
2.7
3.0
3.3
V
Output S/N
S/N
48
52
dB
1.07MHZ beat level
C/S
40
44
dB
Frequency characteristics
fc
6
9
MHz
Differential gain
DG
5
10
%
Differential phase
DP
6
10
deg
No-signal AFT voltage
V7
3.6
3.9
4.2
V
Maximum AFT voltage
V7H
7.3
7.6
7.8
V
Minimum AFT voltage
V7L
0
0.3
0.7
V
AFT detection sensitivity tolerance
frequency
Sf
10
15
20
mV/kHz
VIF input resistance
Ri
f = 38.9MHz
1.3
k
VIF input capacitance
Ci
f = 38.9MHz
2
3
5
PF
APC pull-in range (U)
fPU
0.8
2.0
MHz
APC pull-in range (L)
fPL
-2.0
-0.8
MHz
f U1
0.8
2.0
Maximum variable range
f L1
-2.0
-0.8
MHz
SIF signal level
Sout
110
140
170
mVrms
VCO1 control sensitivity
β
1.4
2.8
5.6
kHz
[SIF block]
SIF limiting sensitivity
VI (lim)
40
46
52
dB
FM detection output voltage
VO (FM)
390
500
710
mVrms
AMR
40
60
dB
Distortion
THD
0.3
1.0
%
SIF S/N
S/N (SIF)
55
62
dB
FM detection range (L)
WFML
2.5
4.0
MHz
FM detection range (H)
WFMH
7.0
8.0
MHz
FM detection output variation
VO
0
2.0
3.0
dB
[INT/EXT SW block]
AFT EXT gain
GAF
-0.7
-0.2
+0.3
dB
AFT EXT distortion
THDAF
0.03
0.5
%
System SW I-SE
V1 TH1
Comments ;
0
1.2
V
System SW I-P/N
V1 TH2
I = INT, E = EXT
1.7
2.6
V
System SW E-P/N
V1 TH3
P/N = PAL/NTSC
2.9
3.8
V
System SW E-SE
V1 TH4
SE = SECAM
4.1
5
V
Continued on next page.
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