參數(shù)資料
型號： T4258NFN
廠商： ATMEL CORP
元件分類： 接收器
英文描述： AM/FM, AUDIO SINGLE CHIP RECEIVER, PDSO44
封裝： SSOP-44
文件頁數(shù)： 24/38頁
文件大?。?/td> 443K
代理商： T4258NFN
30
T4258N
4566B–AUDR–02/04
Local Oscillator and AM
Prescaler Settings
Table 38 gives an example for the VCO prescaler divider and AM prescaler divider set-
tings 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 = (frec + fIF) × VCO Prescaler × AM Prescaler
U4256 N- and R-divider
Calculation
AM Mode
FM/WB Mode
All Modes
fref = reference oscillator frequency (e.g. 10.25 MHz)
fVCO = VCO frequency
frec = reception frequency
fstep = step frequency (of the PLL)
Table 38. VCO and AM Prescaler (Divider) Settings and Reception Frequencies
Band
Prescaler
VCO
IF [MHz]
Minimum Reception
Frequency [MHz]
Maximum Reception
Frequency [MHz]
Minimum VCO
Frequency
Maximum VCO
Frequency
AM
Prescaler
FM
2
+10.7
87.5
108
196.4
237.4
-
WB
1.5
-10.7
162.4
162.55
227.55
227.775
-
JPN
3
-10.7
76
90
195.9
237.9
-
LW/MW
2
+10.7
0.15
1.605
195.3
221.49
9
16m
1
+10.7
17.5
17.9
225.6
228.8
8
120m
2
+10.7
2.3
2.5
208
211.2
8
N
f
VCO
VCO-divider
AM Prescaler
f
step
×
----------------------------------------------------------------------------------------------
=
f
rec
f
VCO
VCO-divider
AM Prescaler
×
----------------------------------------------------------------------------
f
IF
–
=
N
f
VCO
VCO-divider
f
step
×
--------------------------------------------------
=
f
rec
f
VCO
VCO-divider
--------------------------------
f
IF
–
=
R
f
ref
f
step
----------
=
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