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CC1021-RTR1 Datasheet(PDF) 29 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) 29 Page - Texas Instruments

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CC1021
SWRS045
Page 29 of 91
CLOCK_B register), a number between 1
and 7:
1
_
+
=
DIV
REF
f
f
xosc
ref
FSK frequency deviation is programmed in
the DEVIATION register. The deviation
programming is divided into a mantissa
(TXDEV_M[3:0])
and
an
exponent
(TXDEV_X[2:0]).
Generally REF_DIV should be as low as
possible but the following requirements
must be met
[]
MHz
f
f
c
ref
256
8304
.
9
>
≥
in the frequency band 402 ñ 470 MHz, and
[]
MHz
f
f
c
ref
512
8304
.
9
>
≥
in the frequency band 804 - 940 MHz.
The PLL output frequency equations
above give the carrier frequency, fc , in
transmit mode (centre frequency). The two
FSK modulation frequencies are given by:
f0 = fc fdev
f1 = fc + fdev
where fdev is set by the DEVIATION
register:
)
16
_
(
2
_
−
⋅
⋅
=
X
TXDEV
ref
dev
M
TXDEV
f
f
in the frequency band 402 ñ 470 MHz and
)
15
_
(
2
_
−
⋅
⋅
=
X
TXDEV
ref
dev
M
TXDEV
f
f
in the frequency band 804 - 940 MHz.
OOK
(On-Off
Keying)
is
used
if
TXDEV_M[3:0] = 0000.
The TX_SHAPING bit in the DEVIATION
register controls Gaussian shaping of the
modulation signal.
In receive mode the frequency must be
programmed to be the LO frequency. Low
side LO injection is used, hence:
fLO = fc fIF
where fIF is the IF frequency (ideally 307.2
kHz).
11.1. Dithering
Spurious signals will occur at certain
frequencies depending on the division
ratios in the PLL. To reduce the strength of
these spurs, a common technique is to
use a dithering signal in the control of the
frequency dividers. Dithering is activated
by setting the DITHER bit in the FREQ_0
registers. It is recommended to use the
dithering in order to achieve the best
possible performance.



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