CC1020-RTR1 datasheet(62/91 Pages) TI

62 / 91 page

CC1020

SWRS046

Page 62 of 92

200

400

600

800

1000

1200

1400

Voltage on PA_EN/LNA_EN pin [V]

source current, 3 V

sink current, 3V

source current, 2.3 V

sink current, 2.3 V

source current, 3.6 V

sink current, 3.6 V

Figure 35. Typical PA_EN and LNA_EN pin drive

23.

System Considerations and Guidelines

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 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. A

summary of the most important aspects of

these

regulations can be

found in

Application Note AN001 SRD regulations

for license free transceiver operation,

available from the Chipcon web site.

Narrowband systems

CC1020 is specifically designed for

narrowband systems complying with ARIB

STD T-67 and EN 300 220. The

CC1020

meets the strict requirements to ACP

(Adjacent Channel Power) and occupied

bandwidth for a narrowband transmitter.

To meet the ARIB STD T-67 requirements

a 3.0 V regulated voltage supply should be

used.

For the receiver side,

CC1020 gives very

good ACR (Adjacent Channel Rejection),

image frequency suppression and blocking

properties for channel spacings down to

12.5 kHz.

Such narrowband performance normally

requires the use of external ceramic filters.

The

CC1020 provides this performance as

a true single-chip solution with integrated

IF filters.

Japan and Korea have allocated several

frequency bands at 424, 426, 429, 447,

449 and 469 MHz for narrowband license

free operation.

CC1020 is designed to

meet the requirements for operation in all

these

bands,

including

the

strict

requirements for narrowband operation

down to 12.5 kHz channel spacing.

Due to on-chip complex filtering, the image

frequency

removed.

on-chip

calibration circuit is used to get the best

possible image rejection. A narrowband

preselector filter is not necessary to

achieve image rejection.

A unique feature in

CC1020 is the very fine

frequency resolution. This can be used for

temperature compensation of the crystal if

the temperature drift curve is known and a

temperature sensor is included in the

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