ATR4258 datasheet(30/38 Pages) ATMEL

30 / 38 page

4838B–AUDR–05/05

ATR4258

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.,

VCO = 195.9 MHz ... 237.9 MHz

IF = +10.7 MHz or –10.7 MHz

VCO = (frec + fIF) × VCO Prescaler × AM Prescaler

9.3

U4256 N- and R-divider Calculation

9.3.1

AM Mode

9.3.2

FM/WB Mode

Table 9-2.

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

Prescaler

+10.7

87.5

108

196.4

237.4

–

1.5

–10.7

162.4

162.55

227.55

227.775

–

JPN

–10.7

195.9

237.9

–

LW/MW

+10.7

0.15

1.605

195.3

221.49

16m

+10.7

17.5

17.9

225.6

228.8

120m

+10.7

2.3

2.5

208

211.2

VCO

VCO-divider

AM Prescaler

step

----------------------------------------------------------------------------------------------

rec

VCO

VCO-divider

AM Prescaler

----------------------------------------------------------------------------

⎝⎠

⎛⎞ f

–

VCO

VCO-divider

step

--------------------------------------------------

rec

VCO

VCO-divider

--------------------------------

⎝⎠

⎛⎞ f

–

ATR4258 Datasheet(PDF) 30 Page - ATMEL Corporation

ATR4258 Datasheet(HTML) 30 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

Datasheet Download

Link URL