ATR4258 datasheet(29/38 Pages) ATMEL

29 / 38 page

ATR4258

4838A–AUDR–10/04

Application Information

AM Prescaler (Divider)

Settings

The AM mixer is used for up conversion of the AM reception frequency to the IF fre-

quency. Therefore an AM prescaler is implemented to generate the necessary LO from

the VCO frequency. For the reception of the AM band different prescaler (divider) set-

tings are possible.

Table 37 gives an example for the AM prescaler (divider) settings and the reception

frequencies.

e.g.,

VCO = 98.2 MHz ... 124 MHz

IF = 10.7 MHz

Note:

Prescaler VCO Divider = 1 in this example.

Table 37. AM Prescaler (Divider) Settings and Reception Frequencies

Divider (AM Prescaler)

Minimum Reception Frequency

[MHz]

Maximum Reception Frequency

[MHz]

divide by 2

38.4

51.3

divide by 3

20.033

30.633

divide by 4

13.85

20.3

divide by 5

8.94

14.1

divide by 6

5.667

9.967

divide by 7

3.329

7.014

divide by 8

1.575

4.8

divide by 9

0.211

3.078

divide by 10

1.7

rec

VCO

AM Prescaler

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

⎝⎠

⎛⎞ f

–

ATR4258 데이터시트(PDF) 29 Page - ATMEL Corporation

ATR4258 데이터시트(HTML) 29 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

데이터시트 다운로드

링크 URL