CC1110-RTR1 datasheet(154/203 Pages) TI

154 / 203 page

CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 154 of 202

15 Radio

LNA

FREQ

SYNTH

ADC

RADIO CONTROL

RF_P

RF_N

Figure 32: CC1110 Radio Module

A simplified block diagram of the radio

module in the

CC1110 is shown in Figure 32.

CC1110 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 is

performed digitally.

The transmitter part of

CC1110 is based on

direct synthesis of the RF frequency. The

frequency

synthesizer

includes

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 26 MHz crystal oscillator generates

the

reference

frequency

for

the

synthesizer, as well as clocks for the ADC

and the digital part.

An SFR register 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. An on-chip voltage

regulator delivers a regulated 1.8 V supply

voltage.

15.1 Command strobes

The CPU uses a set of command strobes

to control operation of the radio in

CC1110.

Command strobes may be viewed as

single byte instructions which each control

some function of the radio. These

command strobes must be used to enable

the frequency synthesizer, enable receive

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