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CC1050 Datasheet(PDF) 28 Page - Texas Instruments

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Part # CC1050
Description  Single Chip Very Low Power RF Transmitter
Download  40 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

CC1050 Datasheet(HTML) 28 Page - Texas Instruments

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CC1050
SWRS044
Page 28 of 40
System Considerations and Guidelines
SRD regulations
International regulations and national laws
regulate the use of radio receivers and
transmitters. SRDs (Short Range Devices)
for licence free operation are allowed to
operate in the 433 and 868-870 MHz
bands in most European countries. In the
United States such devices operate in the
260–470 and 902-928 MHz bands.
CC1050
is designed to meet the requirements for
operation in all these bands. A summary
of the most important aspects of these
regulations can be found in Application
Note AN001 SRD regulations for licence
free transceiver operation, available from
Chipcon’s web site.
Low cost systems
In systems where low cost is of great
importance the
CC1050 is the ideal choice.
Very few external components keep the
total cost at a minimum. The oscillator
crystal can then be a low cost crystal with
50 ppm frequency tolerance.
Battery operated systems
In low power applications the power down
mode should be used when not being
active. Depending on the start-up time
requirement, the oscillator core can be
powered during power down. See page 21
for information on how effective power
management can be implemented.
Crystal drift compensation
A unique feature in
CC1050 is the very fine
frequency resolution of 250 Hz. This can
be
used
to
do
the
temperature
compensation
of
the
crystal
if
the
temperature drift curve is known and a
temperature sensor is included in the
system. Even initial adjustment can be
done using the frequency programmability.
This eliminates the need for an expensive
TCXO and trimming in some applications.
In less demanding applications a crystal
with low temperature drift and low ageing
could
be
used
without
further
compensation. A trimmer capacitor in the
crystal oscillator circuit (in parallel with C4)
could be used to set the initial frequency
accurately.
High output power systems
The CHP_OUT (LOCK) pin can be
configured to control an power amplifier.
This is controlled by LOCK_SELECT in
the LOCK register.
Frequency hopping spread spectrum
systems
Due to the very fast frequency shift
properties of the PLL, the
CC1050 is also
suitable for frequency hopping systems.
Hop rates of 1-100 hops/s are usually
used depending on the bit rate and the
amount of data to be sent during each
transmission. The two frequency registers
(FREQ_A and FREQ_B) are designed
such that the ‘next’ frequency can be
programmed while the ‘present’ frequency
is used. The switching between the two
frequencies is done through the MAIN
register.
Not Recommended for New Designs


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