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9.2
Local Oscillator and AM Prescaler Settings
Table 9-2 gives an example for the VCO prescaler divider and AM prescaler divider settings and
the reception frequencies.
e.g.,
f VCO = 195.9 MHz ... 237.9 MHz
f IF = +10.7 MHz or – 10.7 MHz
f VCO = (f rec + f IF ) × VCO Prescaler × AM Prescaler
Table 9-2.
VCO and AM Prescaler (Divider) Settings and Reception Frequencies
Prescaler
Minimum Reception Maximum Reception
Minimum VCO
Maximum VCO
AM
Band
FM
WB
JPN
LW/MW
16m
120m
VCO
2
1.5
3
2
1
2
IF [MHz]
+10.7
–10.7
–10.7
+10.7
+10.7
+10.7
Frequency [MHz]
87.5
162.4
76
0.15
17.5
2.3
Frequency [MHz]
108
162.55
90
1.605
17.9
2.5
Frequency
196.4
227.55
195.9
195.3
225.6
208
Frequency
237.4
227.775
237.9
221.49
228.8
211.2
Prescaler
–
–
–
9
8
8
f VCO
VCO-divider × AM Prescaler × f step
f rec = ? ---------------------------------------------------------------------------- ? – f IF
f VCO
VCO-divider × f step
f rec = ? -------------------------------- ? – f IF
9.3
9.3.1
9.3.2
30
U4256 N- and R-divider Calculation
AM Mode
N = ----------------------------------------------------------------------------------------------
f VCO
? VCO-divider × AM Prescaler ?
FM/WB Mode
N = --------------------------------------------------
f VCO
? VCO-divider ?
ATR4258
4838B–AUDR–05/05
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