CC1020-RTR1 datasheet(58/95 Pages) TI1

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Voltage on PA_EN/LNA_EN pin [V]

source current, 3 V

sink current, 3 V

source current, 2.3 V

sink current, 2.3 V

source current, 3.6 V

sink current, 3.6 V

CC1020

SWRS046H – NOVEMBER 2006 – REVISED MARCH 2015

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5.19.3 PA_EN and LNA_EN Pin Drive

Figure 5-32 shows the PA_EN and LNA_EN pin drive currents. The sink and source currents have

opposite signs but absolute values are used in Figure 5-32.

Figure 5-32. Typical PA_EN and LNA_EN Pin Drive

5.20 System Considerations and Guidelines

5.20.1 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 433 and 868 to 870 MHz

bands in most European countries. In the United States, such devices operate in the 260 to 470 and 902

to 928 MHz bands. CC1020 is also applicable for use in the 950 to 960 MHz frequency band in Japan. A

summary of the most important aspects of these regulations can be found in AN001 SRD Regulations For

License Free Transceiver Operation (SWRA090).

5.20.2 Narrowband Systems

CC1020 is specifically designed for narrowband systems complying with ARIB STD-T67 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-T67 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 is removed. An on-chip calibration circuit is used to

get the best possible image rejection. A narrowband preselector filter is not necessary to achieve image

rejection.

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