CC2400-RTR1 datasheet(53/84 Pages) TI2

53 / 84 page

CC2400

SWRS042A

Page 53 of 83

46 System Considerations and Guidelines

46.1 SRD regulations

International regulations and national laws

regulate the use of radio receivers and

transmitters. SRDs (Short Range Devices)

for license free operation are allowed to

operate in the 2.45 GHz bands worldwide.

The most important regulations are EN

300 440 and EN 300 328 (Europe), FCC

CFR47 part 15.247 and 15.249 (USA),

and ARIB STD-T66 (Japan).

The

CC2400EM

reference

design

complies with EN 300 440. If frequency

hopping is to be used at 1 Mbps data rate,

GFSK should be selected to keep the

bandwidth below 1 MHz. The

CC2400

complies with EN 300 440 class 2 if the

band spacing is 2 MHz or more. It

complies with EN 300 440 class 1 if the

channel and band spacing is 10 MHz or

more.

Please

note

that

compliance

with

regulations is dependent on complete

system performance. It is the customer’s

responsibility to ensure that the system

complies with regulations.

46.2 Frequency hopping and multi-

channel systems

The 2.400 – 2.4835 GHz band is shared

by many systems both in industrial, office

and home environment. It is therefore

recommended to use frequency hopping

spread spectrum (FHSS) or a multi-

channel protocol because the frequency

diversity makes the system more robust

with respect to interference from other

systems operating in the same frequency

band.

CC2400 is highly suited for FHSS or multi-

channel systems due to its agile frequency

synthesizer and effective communication

interface. Using the packet handling

support and data buffering is also

beneficial in such systems as these

features will significantly offload the host

controller.

Due to the low-IF I/Q receiver and the on-

chip complex filtering, the image channel

will be significantly rejected. This is

important for all 2.4GHz systems.

46.3 Data burst transmissions

The high maximum data rate of

CC2400

opens up for burst transmissions. A low

average data rate link (say 10 kbps), can

be realized using a higher over-the-air

data

rate.

Buffering

the

data

and

transmitting in bursts at high data rate (say

1 Mbps) will reduce the time in active

mode, and hence also reduce the average

current consumption significantly.

46.4 Continuous transmissions

In data streaming applications the

CC2400

opens up for continuous transmissions at

1 Mbps effective data rate. A typical

application is digital audio systems. As the

modulation is done with an I/Q up-

converter with LO I/Q-signals coming from

a closed loop PLL, there is no limitation in

the length of a transmission. (Open loop

modulation used in some transceivers

often prevents this kind of continuous data

streaming and reduces the effective data

rate.)

46.5 Crystal drift compensation

A unique feature in

CC2400 is the very fine

frequency

resolution

using

the

MDMCTRL.MOD_OFFSET[5:0].

This

feature can be used to compensate for

frequency

offset

and

drift.

The

compensation affects both the receiver

and the transmitter of the device being

compensated. I.e. the received signal of

the device will match the receiver’s

channel filter better. In the same way the

center frequency of the transmitted signal

will match the ‘external’ transmitter’s

signal.

Initial adjustment can be done using this

frequency

programmability.

This

eliminates the need for an expensive

TCXO and trimming in some applications.

The frequency offset between an ‘external’

transmitter and the receiver is measured

in the

CC2400 and can be read back from

internal

(FREQEST.RX_FREQ_OFFSET[7:0]).

The measured frequency offset can thus

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