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CC2500 Datasheet(PDF) 39 Page - Texas Instruments

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Part # CC2500
Description  Single Chip Low Cost Low Power RF Transceiver
PDF  76 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

CC2500 Datasheet(HTML) 39 Page - Texas Instruments

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CC2500
Preliminary Data Sheet (rev.1.1.)
SWRS040
Page 39 of 77
56 bytes
8 bytes
Overflow
margin
Underflow
margin
FIFO_THR=13
FIFO_THR=13
RXFIFO
TXFIFO
Figure 15: Example of FIFOs at threshold
21 Frequency Programming
The frequency programming in
CC2500 is
designed
to
minimize
the
programming
needed in a channel-oriented system.
To set up a system with channel numbers, the
desired channel spacing is programmed with
the
MDMCFG0.CHANSPC_M
and
MDMCFG1.CHANSPC_E registers. The channel
spacing registers are mantissa and exponent
respectively.
The base or start frequency is set by the 24 bit
frequency word located in the FREQ2, FREQ1
and FREQ0 registers. This word will typically
be set to the centre of the lowest channel
frequency that is to be used.
The desired channel number is programmed
with the 8-bit channel number register,
CHANNR.CHAN, which is multiplied by the
channel offset. The resultant carrier frequency
is given by:
()
(
)
()
2
_
16
2
_
256
2
−
⋅
+
⋅
+
⋅
=
E
CHANSPC
XOSC
carrier
M
CHANSPC
CHAN
FREQ
f
f
With a 26 MHz crystal the maximum channel
spacing is 405 kHz. To get e.g. 1 MHz channel
spacing one solution is to use 333 kHz
channel spacing and select each third channel
in CHANNR.CHAN.
The preferred IF frequency is programmed
with the FSCTRL1.FREQ_IF register. The IF
frequency is given by:
IF
FREQ
f
f
XOSC
IF
_
210
⋅
=
Note that the SmartRF
®
Studio software
automatically
calculates
the
optimum
FSCTRL1.FREQ_IF register setting based on
channel spacing and channel filter bandwidth.
If any frequency programming register is
altered when the frequency synthesizer is
running,
the
synthesizer
may
give
an
undesired response. Hence, the frequency
programming should only be updated when
the radio is in the IDLE state.



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