CC1010-RTY1 datasheet(133/152 Pages) TI

133 / 152 page

CC1010

SWRS047

Page 133 of 152

19.10 PCB Layout Recommendations

Chipcon provide reference layouts that

should be followed in order to achieve the

best performance. The reference designs

can be downloaded on the Chipcon

website.

A four layer PCB is highly recommended.

The top layer should be used for signal

routing, and the open areas should be

filled with metallisation connected to

ground using many vias. The second layer

of the PCB should be the “ground-plane”.

Layer three is used for power supply and

layer

four

for

general

routing

and

decoupling. A few components are also

placed at the reverse side (VCO inductor

and power filtering).

The ground pins should be connected to

ground as close as possible to the

package pin using individual vias for each

pin. The de-coupling capacitors should

also be placed as close as possible to the

supply pins and connected to the ground

plane by separate vias. For 868 and 915

MHz operation, some of the AVDD supply

pins should be fitted with ferrite beads in

series to prevent noise from coupling from

one supply pin to another. Please see the

reference layouts for more information. For

433 and 315 MHz operation these beads

are not required, and can be replaced with

0-ohm resistors or PCB traces.

The external components should be as

small as possible and surface mount

devices are required. The VCO inductor

must be placed as close as possible to the

chip and symmetrical with respect to the

input pins. It is important to keep the

coupling between the VCO inductor and

the matching network low in order to

reduce LO leakage. Due to this the VCO

inductor is placed at the reverse side of

the PCB.

A development kit with a fully assembled

PCB is available, and can be used as a

guideline for layout.

Full documentation and Gerber PCB

layout files are available on Chipcon’s web

site.

19.11 Antenna Considerations

CC1010 can be used together with various

types of antennas. The most common

antennas for short-range devices are

monopole, helical and loop antennas.

Monopole

antennas

are

resonant

antennas with a length corresponding to

one quarter of the electrical wavelength

(

λ/4). They are very easy to design and

can be implemented simply as a “piece of

wire” or even integrated into the PCB.

Non-resonant monopole antennas shorter

than

λ/4 can also be used, but at the

expense of range. In size and cost critical

applications such an antenna may very

well be integrated into the PCB.

Helical antennas can be thought of as a

combination of a monopole and a loop

antenna. They are a good compromise in

size critical applications. But helical

antennas tend to be more difficult to

optimise than the simple monopole.

Loop antennas are easy to integrate into

the PCB, but are less effective due to

difficult impedance matching because of

their very low radiation resistance if they

are made small.

For low power applications the

λ/4-

monopole antenna is recommended giving

the best range and because of its

simplicity.

The length of the

λ/4-monopole antenna is

given by:

L = 7125 / f

where f is in MHz, giving the length in cm.

An antenna for 869 MHz should be 8.2

cm, and 16.4 cm for 434 MHz.

The antenna should be connected as

close as possible to the IC. If the antenna

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