MC1374
Figure 13. Modulator Transfer Function
Figure 14. Distortion versus Modulation Depth
2.1
2.0
1.9
1.8
1.7
5.0
4.0
T
= 25°C
A
V
= 12 V
= 25°C
= 4.5 MHz
CC
V
= 12 V
CC
(1.76 MHz)
T
A
c
f
V
= 5.0 V, 9.0 V
CC
3.0
2.0
Self Bias (2.9–3.0 V)
1.6
1.5
1.4
1.3
Optimum Bias (2.6–2.7 V)
1.0
0
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
0
25
50
75
100
DC INPUT VOLTAGE, PIN 14 (V)
DEVIATION (kHz)
Figure 16. FM System Frequency
versus Temperature
Figure 15. Modulator Transfer Function
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.55
4.54
4.53
4.52
4.51
4.50
4.49
T
= 25°C
A
V
= 12 V
CC
(4.5 MHz)
V
= 12 V
CC
Pin 14 V to 2.6 V
V
= 5.0 V, 9.0 V
CC
180 k/30 k Divider
Pin 14 Open
4.2
4.1
4.48
4.47
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
0
25
50
75
C)
100
DC INPUT VOLTAGE, PIN 14 (V)
T , AMBIENT TEMPERATURE (
°
A
Figure 17. Modulator Transfer Function
Figure 18. FM System Frequency versus V
CC
11.6
4.50
4.49
4.48
4.47
12 V
9.0 V V
5.0 V
Pin 14 to 2.6 V Source
T
= 25°C
A
CC
11.4
11.2
11.0
10.8
10.6
10.4
10.2
10.0
9.8
(10.7 MHz)
Pin 14 Open
4.46
4.45
4.44
4.43
4.42
Pin14 – 180 k/ 30 k Divider
T
= 25
10
°C
A
9.6
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
4.0
5.0
6.0
7.0
8.0
9.0
11
12
DC INPUT VOLTAGE, PIN 14 (V)
V
, SUPPLY VOLTAGE (Vdc)
CC
7
MOTOROLA ANALOG IC DEVICE DATA
MOTOROLA [ MOTOROLA ]
