C2510Fx / CC2511Fx
14 Radio
RADIO CONTROL
DEMODULATOR
ADC
LNA
FEC / INTERLEAVER
PACKET HANDLER
RF_P
RF_N
0
90
FREQ
SYNTH
MODULATOR
PA
Figure 46: CC2510Fx/CC2511Fx Radio Module
A simplified block diagram of the radio module
in the
CC2510Fx/CC2511Fx
is shown in Figure 46.
CC2510Fx/CC2511Fx
features a low-IF receiver.
The received RF signal is amplified by the low-
noise amplifier (LNA) and down-converted in
quadrature (I and Q) to the intermediate
frequency (IF). At IF, the I/Q signals are
digitized by the ADCs. Automatic gain control
(AGC), fine channel filtering, demodulation
bit/packet synchronization are performed
digitally.
The transmitter part of
CC2510Fx/CC2511Fx
is
based on direct synthesis of the RF frequency.
The frequency synthesizer includes a
completely on-chip LC VCO and a 90 degrees
phase shifter for generating the I and Q LO
signals to the down-conversion mixers in
receive mode.
The high speed crystal oscillator generates the
reference frequency for the synthesizer, as
well as clocks for the ADC and the digital part.
An SFR interface is used for data buffer
access from the CPU. Configuration and status
registers are accessed through registers
mapped to XDATA memory.
The digital baseband includes support for
channel configuration, packet handling, and
data buffering.
Note: In this section of the document, f
Ref
is used to denote
the reference frequency for the synthesizer.
For
CC2510Fx
f
ref
=
f
XOSC
and for
CC2511Fx
,
f
ref
=
f
XOSC
2
14.1 Command Strobes
The CPU uses a set of command strobes to
control operation of the radio.
Command strobes may be viewed as single
byte instructions which each start an internal
sequence in the radio. These command
strobes are used to enable the frequency
synthesizer, enable receive mode, enable
transmit mode, etc. (see Figure 47).
The 6 command strobes are listed in Table 61
on Page 189.
SWRS055D
CPU INTERFACE
ADC
Page 187 of 243
TAOS [ TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS ]
