CC1070-RTY1 datasheet(37/57 Pages) TI2

37 / 57 page

CC1070

SWRS043A

Page 37 of 54

20.3 PA_EN Pin Drive

Figure 21 shows the PA_EN pin drive

currents. The sink and source currents

have opposite signs but absolute values

are used in Figure 21.

200

400

600

800

1000

1200

1400

Voltage on PA_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 21. Typical PA_EN pin drive

21 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 TI web site.

Narrow band systems

CC1070

specifically

designed

for

narrowband systems complying with ARIB

STD T-67 and EN 300 220. The

CC1070

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.

Such narrowband performance normally

requires the use of external ceramic filters.

The

CC1070 provides this performance as a

true single-chip solution.

Japan and Korea have allocated several

frequency bands at 424, 426, 429, 449

and 469 MHz for narrowband license free

operation.

CC1070 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.

A unique feature in

CC1070 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

system. Even initial adjustment can be

performed

using

the

frequency

programmability. This eliminates the need

for an expensive TCXO and trimming in

some applications. For more details refer

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