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參數(shù)資料
| 型號： | MC13030 |
| 廠商： | Motorola, Inc. |
| 英文描述： | DUAL CONVERSION AM RECEIVER |
| 中文描述： | 二次變頻接收機(jī)上午 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大小： | 386K |
| 代理商： | MC13030 |
MC13030
5
MOTOROLA ANALOG IC DEVICE DATA
Pin 6 Current versus Mixer1 and Mixer2 Input Level:
The internal resistance from Pin 6 to ground is 39 k.
The RF AGC voltage on Pin 4 is 2.0 V when the voltage on
Pin 6 is 1.2 V. Therefore, the desired AGC thresholds for
either mixer can be set with these curves. The design steps
are described in the design notes.
Figure 6. Pin 6 Current versus Mixer1 Input Level
250
MIXER1 INPUT LEVEL (dB
μ
V)
90
100
110
120
0
50
100
150
200
P
μ
P
μ
Figure 7. Pin 6 Current versus Mixer2 Input Level
MIXER2 INPUT LEVEL (dB
μ
V)
80
90
120
0
50
100
150
200
100
110
250
Mixer1 AGC Gain Increase versus R7:
Adding a resistor from Pin 7 to ground increases the AGC
sensitivity of Mixer1. The range of increase in dB can be
found from this curve. This is useful after setting up the AGC
threshold of Mixer2.
Figure 8. Mixer1 AGC Gain Increase versus R7
R7
100
10 k
0
5.0
6.0
7.0
8.0
I
1.0 k
1.0
2.0
3.0
4.0
Pin 5 Current versus Pin 4 Voltage:
All the curves give Pin 4 AGC voltage versus some other
input level. This curve can be used to determine the auxiliary
AGC current from Pin 5 at a given Pin 4 voltage.
Figure 9. Pin 5 Current versus Pin 4 Voltage
PIN 5 CURRENT (mA)
0
0.4
0.8
1.2
0
1.0
2.0
3.0
4.0
5.0
P
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