CC1010-RTY1 datasheet(131/152 Pages) TI

131 / 152 page

CC1010

SWRS047

Page 131 of 152

19. System Considerations and Guidelines

19.1 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.

CC1010

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 on

Chipcon’s web site.

19.2 Low cost systems

In systems where low cost is of great

importance the

CC1010 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

50/25 ppm frequency tolerance at 433/868

MHz respectively.

19.3 Battery operated systems

low

power

applications

the

Transceiver power down mode should be

used when no communication takes place.

Using receiver polling, that is, listening for

transmissions for a few milliseconds at

regular intervals, will also save a lot of

battery power. The RSSI can be used as a

first indication that a transmission is

received. See page 89 for information on

how effective power management can be

implemented. Utilizing the Idle mode and

Power down modes and clock modes of

the MCU will also reduce the power

consumption significantly. See page 33 for

details. Also of interest is Application Note

AN017 Low Power Systems Using the

CC1010, available on Chipcon’s web site.

19.4 Narrow-band systems

CC400,

CC900

and

CC1020

are

recommended for best performance in

narrow-band applications. The phase

noise of these chips is superior, and for

systems with 25 kHz channel spacing or

less with strict requirements to ACP

(Adjacent Channel Power), low phase

noise is important.

The selectivity of

CC1010 can be improved

by using an external ceramic filter and

demodulator at 10.7 MHz. Such ceramic

filters are typically 180 or 280 kHz wide.

A unique feature in

CC1010 is the very fine

frequency resolution of < 250 Hz. This can

used

the

temperature

compensation

the

crystal

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

used

without

further

compensation. A trimmer capacitor in the

crystal oscillator circuit (in parallel with

C171) could be used to set the initial

frequency accurately. The fine frequency

step programming cannot be used in RX

mode if optimised frequency settings are

required (see page 111).

19.5 High reliability systems

Using a SAW filter as a preselector

between the antenna and the RF input will

improve the communication reliability in

harsh environments by reducing the

probability of blocking. The receiver

sensitivity and the output power will be

reduced due to the filter insertion loss. By

inserting the filter in the RX path only,

together with an external RX/TX switch,

only the receiver sensitivity is reduced,

and output power is unaffected. Any

general-purpose

I/O

pins

can

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