參數(shù)資料
型號： LA7790M
廠商： Sanyo Electric Co.,Ltd.
英文描述： QPSK Transmitter for Cable TV
中文描述： 調(diào)制變送器有線電視
文件頁數(shù)： 2/14頁
文件大小： 174K
代理商： LA7790M
No. 5689-2/14
LA7790M
Parameter
Symbol
Conditions
Ratings
Unit
Maximum power supply voltage
V
CC
max
Vmax
Pins 1, 10, and 24
7
V
Circuit voltage
Pins 1, 12, 17, 20, 21, and 23
V
CC
V
Circuit current
I
11
I
19
Output lead-in current
1
mA
2
mA
Allowable power dissipation
Pd max
Ta
≤
54°C
650
mW
Operating ambient temperature
Topr
–20 to +70
°C
Storage temperature
Tstg
–55 to +150
°C
Specifications
Maximum Ratings
at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
Current drain
Circuit current 1
I
1
With no signal, pin 1
26
33
44
mA
Circuit current 2
I
24
+ I
10
With no signal, pins 24 and 10
44
55
73
mA
Modulator fo: f(V19) = 25 MHz
Output frequency range
f
(V19)
5
70
MHz
Output signal level
V
19(DSB)
Note 1: V
20
= V
23
= GND,
V
12
= V
17
= V
21
= V
CC
, S1 = A
Note 2: V
20
= V
23
= GND,
V
12
= V
17
= V
21
= V
CC
, S1 = A
Note 3: V
20
= V
23
= GND,
V
12
= V
17
= V
21
= V
CC
, S1 = A
Note 3: V
20
= V
23
= GND,
V
12
= V
17
= V
21
= V
CC
, S1 = A
Note 4: V
20
= V
23
= GND,
V
12
= V
17
= V
21
= V
CC
, S1 = A
Note 5: V
20
= V
23
= GND,
V
12
= V
17
= V
21
= V
CC
, S1 = A
V
4.5
= |V
4
— V
5
|
V
8.9
= |V
8
— V
9
|
External DC bias voltage
–7
–4
–2
dBm
Output harmonic distortion
V
19(HD2)
V
19(HD3)
40
dB
35
dB
Output secondary harmonic distortion
V
19(2fo)
20
dB
Output tertiary harmonic distortion
V
19(3fo)
8
dB
Carrier suppression ratio
V
19(fo)
30
dB
Sideband suppression ratio
V
19(SSB)
30
dB
I input level
V
4.5
V
8.9
V
4, 5
V
8, 9
V
6
500
mVp-p
Q input level
500
mVp-p
I input DC voltage
1.9
2.1
2.3
V
Q input DC voltage
External DC bias voltage
1.9
2.1
2.3
V
Reference voltage
Internal DC bias voltage
1.9
2.1
2.3
V
Variable attenuator
Minimum gain control voltage
V
21
V
12
= V
17
= V
CC
, V
20
= V
23
= GND, S1 = A
Note 6: V
20
= V
23
= GND, V
12
= V
17
= V
CC
,
S1 = A, V
21
= V
CC
→
0.5 V
V
12
= V
17
= V
21
= V
CC
,
V
20
= V
23
= GND, S1 = A
0
0.5
V
Gain range
V
19(GR)
45
dB
Modulator output impedance
R
19
80
120
160
VCO
Oscillator frequency range
f
(osc)
V
12
= V
17
= V
21
= V
CC
,
V
20
= V
23
= GND, S1 = A
V
12
= V
17
= V
21
= V
CC
,
V
20
= V
23
= GND, S1 = A
V
12
= V
17
= V
21
= V
CC
,
V
20
= V
23
= GND, S1 = A
20
280
MHz
VCO output level
V
11(fo)
500
700
900
mVp-p
VCO output impedance
R
11
200
300
400
Band switch
Band switch 1 “H” level
f(V19) = 25 MHz
V
17H
Note 7: V
12
= V
21
= V
CC
,
V
20
= V
23
= GND, S1 = A
Note 7: V
12
= V
21
= V
CC
,
V
20
= V
23
= GND, S1 = A
4
V
Band switch 1 “L” level
f(V19) = 12.5 MHz
V
17L
1
V
Operating Characteristics
at Ta = 25°C, V
CC
= 5.0 V
Parameter
Symbol
Conditions
Ratings
Unit
Operating power supply voltage
V
CC
op
Pins 1, 10, and 24
4.5 to 5.5
V
Recommended Conditions
at Ta = 25°C
Continued on next page.
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