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ATR4258
Table 4-5.
Local Oscillator Prescaler (VCO/Buffer Divider)
Prescaler VCO
1
1.5
1.5
2
3
Prescaler Buffer
1
3
1.5
2
3
Bit 12
X
0
1
X
X
Bit 11
0
0
0
1
1
Bit 10
0
1
1
0
1
Note:
The U4256 FMOSCIN (pin 19) input frequency is limited to 160 MHz.
4.4
FM RF-AGC
The FM RF-AGC circuit includes a wide-band level detector at the input pin 1 of the FM mixer
and an in-band level detector at the output of the FM IF amplifier (pin 30). The outputs of these
level detectors are used to control the current into the pin diode (see Figure 4-1 ) in order to limit
the signal level at the FM mixer input and the following stages. The maximum pin diode current
is determined by R115 and the time constant of the AGC control loop can be adjusted by chang-
ing the value of C111.
The AGC threshold level at the input of the FM mixer can be adjusted by bit 64 and bit 65
according to Table 4-6 . The in-band AGC threshold refers to the FM mixer input (pin 1, pin 2)
depends on the gain of the FM IF amplifier and can be adjusted by bit 89 to bit 91.
Table 4-6.
FM-AGC Threshold
Figure 4-1.
FM-AGC Threshold
100 dBμV
97 dBμV
94 dBμV
91 dBμV
FM RF-AGC Bit 92
AGC
V S
Pin 42
Pin 5
B92
C111
Bit 65
0
0
1
1
PIN Diode
Bit 64
0
1
0
1
7
4838B–AUDR–05/05
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