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CC1021-RTR1 Datasheet(PDF) 28 Page - Texas Instruments

No. de pieza CC1021-RTR1
Descripción Electrónicos  Single Chip Low Power RF Transceiver for Narrowband Systems
PDF  92 Pages
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

CC1021-RTR1 Datasheet(HTML) 28 Page - Texas Instruments

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CC1021
SWRS045
Page 28 of 91
Crystal frequency [MHz]
Data rate
[kBaud]
4.9152
7.3728
9.8304
12.288
14.7456
17.2032
19.6608
0.45
X
X
0.5
X
0.6
X
X
X
X
X
X
X
0.9
X
X
1
X
1.2
X
X
X
X
X
X
X
1.8
X
X
2
X
2.4
X
X
X
X
X
X
X
3.6
X
X
4
X
4.096
X
X
4.8
X
X
X
X
X
X
X
7.2
X
X
8
X
8.192
X
X
9.6
X
X
X
X
X
X
X
14.4
X
X
16
X
16.384
X
X
19.2
X
X
X
X
X
X
X
28.8
X
X
32
X
32.768
X
X
38.4
X
X
X
X
X
X
X
57.6
X
X
64
X
65.536
X
76.8
X
X
X
X
X
X
X
115.2
X
X
128
X
153.6
X
X
X
X
X
Table 17. Some possible data rates versus crystal frequency
11.
Frequency Programming
Programming the frequency word in the
configuration registers sets the operation
frequency. There are two frequency words
registers, termed FREQ_A and FREQ_B,
which can be programmed to two different
frequencies. One of the frequency words
can be used for RX (local oscillator
frequency)
and
the
other
for
TX
(transmitting carrier frequency) in order to
be able to switch very fast between RX
mode and TX mode. They can also be
used for RX (or TX) at two different
channels. The F_REG bit in the MAIN
register selects frequency word A or B.
The frequency word is located
in
FREQ_2A:FREQ_1A:FREQ_0A
and
FREQ_2B:FREQ_1B:FREQ_0B for the
FREQ_A and FREQ_B word respectively.
The LSB of the FREQ_0 registers are
used to enable dithering, section 11.1.
The PLL output frequency is given by:
⋅
+
+
⋅
=
32768
5
.
0
4
3
DITHER
FREQ
f
f
ref
c
in the frequency band 402 ñ 470 MHz, and
⋅
+
+
⋅
=
16384
5
.
0
2
3
DITHER
FREQ
f
f
ref
c
in the frequency band 804 ñ 940 MHz.
The BANDSELECT bit in the ANALOG
register controls the frequency band used.
BANDSELECT = 0 gives 402 - 470 MHz,
and BANDSELECT = 1 gives 804 - 940
MHz.
The reference frequency is the crystal
oscillator clock frequency divided by
REF_DIV (3 bits in the CLOCK_A or



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