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

MIXER1 INPUT LEVEL (dB

µV)

90

100

110

120

0

50

100

150

200

250

Figure 7. Pin 6 Current versus Mixer2 Input Level

MIXER2 INPUT LEVEL (dB

µV)

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

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