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4.5
AM RF-AGC
The AM RF-AGC controls the current into the AM pin diodes (pin 7) and the source drain voltage
of the MOSFET in the AM preamplifier stage (pin 6) to limit the level at the AM mixer input (pin 3,
pin 41). This threshold level can be set by bit 64 and bit 65. If the level at the AM mixer input
exceeds the selected threshold, the current into the AM pin diodes is increased. If this step is not
sufficient, the source drain voltage of the MOSFET is decreased. The time constant of the AGC
control loop can be adjusted by changing the value of the capacitor at pin 8.
Table 4-7.
AM-AGC Threshold
4.6
FM 1 st Mixer
AM-AGC Threshold
91 dBμV
94 dBμV
97 dBμV
100 dBμV
Bit 65
0
0
1
1
Bit 64
0
1
0
1
In the 1 st FM mixer stage, the FM reception frequency is down converted to the 1 st IF frequency.
The VCO frequency is used as LO frequency for the mixer.
4.7
AM 1 st Mixer
The AM 1 st mixer is used for up-conversion of the AM reception frequency to the 1 st IF fre-
quency. Therefore, an AM prescaler is implemented to generate the necessary LO frequency
from the VCO frequency. The divide factor of the AM prescaler can be selected according to
Table 4-8 . (The AM prescaler is only active in AM mode).
Table 4-8.
Divide Factor of the AM Prescaler
Divider (AM Prescaler)
Divide by 2
Divide by 3
Divide by 4
Divide by 5
Divide by 6
Divide by 7
Divide by 8
Divide by 9
Divide by 10
Bit 93
1
1
1
1
1
1
1
1
1
Bit 92
0
0
0
0
0
0
0
0
0
Bit 84
0
0
0
0
0
0
0
0
1
Bit 83
0
0
0
0
1
1
1
1
X
Bit 82
0
0
1
1
0
0
1
1
X
Bit 81
0
1
0
1
0
1
0
1
X
8
ATR4258
4838B–AUDR–05/05
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