ATR4258 datasheet(29/38 Pages) ATMEL

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4838B–AUDR–05/05

ATR4258

Application Information

9.1

AM Prescaler (Divider) Settings

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

Therefore an AM prescaler is implemented to generate the necessary LO from the VCO fre-

quency. For the reception of the AM band different prescaler (divider) settings are possible.

Table 9-1 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 9-1.

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

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