MC13030 데이터 시트보기 (PDF) - Motorola => Freescale
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MC13030 Datasheet PDF : 16 Pages
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MC13030
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
200
150
100
50
0
90
100
110
120
MIXER1 INPUT LEVEL (dBµV)
Figure 7. Pin 6 Current versus Mixer2 Input Level
250
200
150
100
50
0
80
90
100
110
120
MIXER2 INPUT LEVEL (dBµV)
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
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
100
1.0 k
10 k
R7
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
5.0
4.0
3.0
2.0
1.0
0
0
0.4
0.8
1.2
PIN 5 CURRENT (mA)
MOTOROLA ANALOG IC DEVICE DATA
5
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