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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： | 2/6页 |
| 文件大小： | 106K |
| 代理商： | LA7688 |
No. 5635-2/6
LA7688
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
[Circuit Voltages and Currents]
Horizontal power-supply voltage
VCCH
Deflection system (V24)
6.4
6.9
7.4
V
Current drain
I40
78
90
100
mA
I45
34
40
48
mA
[VIF Block]
RF AGC maximum voltage
V50H
7.5
7.8
V
RF AGC minimum voltage
V50L
0.2
0.6
V
Input sensitivity
Vi
39
45
dB
AGC range
GR
56
60
dB
Maximum allowable input
VIN max
95
100
dB
Quiescent video output voltage
V8
4.1
4.4
4.7
V
Synchronizing 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 voltage
VBTH
1.0
1.3
1.7
V
Black noise clamp voltage
VBCL
2.7
3.0
3.3
V
Output signal-to-noise ratio
S/N
48
52
dB
1.07 MHz beat level
C/S
40
44
dB
Frequency characteristics
fC
6
9
MHz
Differential gain
DG
5
10
%
Differential phase
DP
6
10
deg
Quiescent 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
Sf
10
15
20
mV/kHz
VIF input resistance
Ri
f = 38.9 MHz
1.0
1.3
1.6
k
VIF input capacitance
Ci
f = 38.9 MHz
2
3
5
pF
APC pull-in range (U)
fPU
0.8
2.0
MHz
APC pull-in range (L)
fPL
–2
–0.8
MHz
VCO1 maximum variation range
fU1
0.8
2.0
MHz
fL1
–2.0
–0.8
MHz
SIF signal level
SOUT
110
140
170
mVrms
VCO1 control sensitivity
2.4
4.8
9.6
kHz
[SIF Block]
SIF limiting sensitivity
Vi (lim)
40
46
52
dB
FM detector output voltage
VO (FM)
390
500
710
mVrms
AMR
40
60
dB
Total harmonic distortion
THD
0.3
1.0
%
SIF S/N
S/N (SIF)
55
62
dB
FM detector range (L)
WFML
2.5
4.0
MHz
FM detector range (H)
WFMH
7.0
8.0
MHz
FM detector output variability
VO
0
2.0
3.0
dB
[INT/EXT Switching Block]
AFT EXT gain
GAF
–0.7
–0.2
+0.3
dB
AFT EXT distortion
THD AF
0.03
0.5
%
System switch I-SE
V1TH1
Notes:
0
1.2
V
System switch I-P/N
V1TH2
I = INT, E = EXT
1.7
2.6
V
System switch E-P/N
V1TH3
P/N = PAL/NTSC
2.9
3.8
V
System switch E-SE
V1TH4
SE = SECAM
4.1
5
V
[Video Switching Block]
Video signal input 1 DC voltage
V10DC
3.2
3.5
3.8
V
Video signal input 1 AC voltage
V10AC
1.0
Vp-p
Video signal input 2 DC voltage
V14DC
3.2
3.5
3.8
V
Video signal input 2 AC voltage
V14AC
1.0
Vp-p
SVO pin DC voltage
V16DC
2.5
2.8
3.1
V
SVO pin AC voltage
V16AC
1.7
2.0
2.3
Vp-p
Operating Characteristics at Ta = 25°C, VCC40, 45 = 7.8 V, I24 = 12 mA
Continued on next page.
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