ATA5425-PLSW datasheet(28/100 Pages) ATMEL

28 / 100 page

4841D–WIRE–10/07

ATA5423/ATA5425/ATA5428/ATA5429

The variable FREQ depends on FREQ2 and FREQ3, which are defined by the bits FR0 to FR12

in control register 2 and 3, and is calculated as follows:

FREQ = FREQ2 + FREQ3

Care must be taken to the harmonics of the CLK output signal f

CLK as well as to the harmonics

produced by an microprocessor clocked with it, since these harmonics can disturb the reception

of signals if they get to the RF input. In a single channel system, using FREQ = 3803 to 4053

ensures that the harmonics of this signal do not disturb the receive mode. In a multichannel sys-

tem, the CLK signal can either be not used or carefully laid out on the application PCB. The

supply voltage of the microcontroller must also be carefully blocked in a multichannel system.

Table 4-1.

Calculation of f

Frequency

(MHz)

Pin 6

433_N868

CREG1

Bit(4)

XTO (MHz)

RF = fTX_ASK = fRX

TX_FSK_L

TX_FSK_H

Frequency

Resolution

315

AVCC

12.73193

fRF –15.54 kHz

RF +

15.54 kHz

777.1 Hz

345

AVCC

13.94447

RF –17.02 kHz

fRF +

17.02 kHz

851.1 Hz

433.92

AVCC

13.25311

fRF –16.17 kHz

RF +

16.17 kHz

808.9 Hz

868.3

GND

13.41191

RF –16.37 kHz

RF +

16.37 kHz

818.6 Hz

915

GND

14.13324

RF –17.25 kHz

fRF +

17.25 kHz

862.6 Hz

XTO

24.5

FREQ

20.5

16384

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

⎝⎠

⎛⎞

XTO

24.5

FREQ

20.5

16384

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

⎝⎠

⎛⎞

XTO

32.5

FREQ

20.5

16384

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

⎝⎠

⎛⎞

XTO

64.5

FREQ

20.5

16384

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

⎝⎠

⎛⎞

XTO

64.5

FREQ

20.5

16384

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

⎝⎠

⎛⎞

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