MC1490 Motorola, MC1490 Datasheet - Page 4

• Manufacturer Part Number: MC1490
• Description: WIDEBAND AMPLIFIER WITH AGC
• Manufacturer: Motorola

4
8.0
6.0
4.0
2.0
20
18
16
14
12
10
0
100
V CC = 12 Vdc
200
Figure 11. Noise Figure versus
R S , SOURCE RESISTANCE ( )
400 600
Source Resistance
f = 105 MHz
(50
1.0 k
Figure 14. 10.7 MHz Amplifier Gain
f = 60 MHz
10.7 MHz
Reduction for AM Carrier (For Test Circuit, See Figure 14)
Source)
V AGC
5.0
L1 = 24 turns, #22 AWG wire
40
35
30
25
20
15
10
0
2.0 k
Figure 13. Harmonic Distortion versus AGC Gain
0
on a T12–44 micro metal
Toroid core (–124 pF)
0.002
f = 10.7 MHz
Modulation: 90 % AM, f m = 1.0 kHz
Load at Pin 8 = 2.0 k
E O = peak–to–peak envelope of
modulated 10.7 MHz carrier at Pin 8
82 pF
f = 30 MHz
5.6 k
50–150 pF
10
4.0 k
E O = 2400 mVpp
20
10 k
G R , GAIN REDUCTION (dB)
L1
MC1490
30
4
6
5
3
MC1490P
40
7
2
]
L2 = 20 turns, #22 AWG wire
40
35
30
25
20
15
10
5
0
50
55 dB, BW
0
on a T12–44 micro metal
Toroid core (–100 pF)
f = 30 MHz
BW = 1.0 MHz
8
1
0.002
760 mVpp
RFC
–10
60
L2
36 pF
Figure 12. Noise Figure versus
240 mVpp
]
MOTOROLA ANALOG IC DEVICE DATA
–20
70
0.002
100 kHz
AGC Gain Reduction
G R , GAIN REDUCTION (dB)
50
+12 Vdc
–30
80
Load
–40
Test circuit has tuned input
providing a source resistance
optimized for best noise figure.
–50
–60
–70
–80