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ATA5428-PLSW Datasheet(PDF) 28 Page - ATMEL Corporation

Part # ATA5428-PLSW
Description  UHF ASK/FSK Transceiver
PDF  100 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATA5428-PLSW Datasheet(HTML) 28 Page - ATMEL Corporation

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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
RF
Frequency
(MHz)
Pin 6
433_N868
CREG1
Bit(4)
FS
f
XTO (MHz)
f
RF = fTX_ASK = fRX
f
TX_FSK_L
f
TX_FSK_H
Frequency
Resolution
315
AVCC
1
12.73193
fRF –15.54 kHz
f
RF +
15.54 kHz
777.1 Hz
345
AVCC
0
13.94447
f
RF –17.02 kHz
fRF +
17.02 kHz
851.1 Hz
433.92
AVCC
0
13.25311
fRF –16.17 kHz
f
RF +
16.17 kHz
808.9 Hz
868.3
GND
0
13.41191
f
RF –16.37 kHz
f
RF +
16.37 kHz
818.6 Hz
915
GND
0
14.13324
f
RF –17.25 kHz
fRF +
17.25 kHz
862.6 Hz
f
XTO
24.5
FREQ
20.5
+
16384
----------------------------------
+
⎝⎠
⎛⎞
×
f
XTO
24.5
FREQ
20.5
+
16384
----------------------------------
+
⎝⎠
⎛⎞
×
f
XTO
32.5
FREQ
20.5
+
16384
----------------------------------
+
⎝⎠
⎛⎞
×
f
XTO
64.5
FREQ
20.5
+
16384
----------------------------------
+
⎝⎠
⎛⎞
×
f
XTO
64.5
FREQ
20.5
+
16384
----------------------------------
+
⎝⎠
⎛⎞
×



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