CC1020-RTR1 datasheet(53/91 Pages) TI

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CC1020

SWRS046

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[nF]

[pF]

[kΩ]

PLL turn-on time

[us]

Comment

220

8200

2200

1.5

4.7

3200

Up to 4.8 kBaud data rate, 12.5 kHz channel

spacing

100

3900

1000

2.2

6.8

2500

Up to 4.8 kBaud data rate, 25 kHz channel spacing

2200

560

3.3

1400

Up to 9.6 kBaud data rate, 50 kHz channel spacing

560

150

5.6

1300

Up to 19.2 kBaud data rate, 100 kHz channel

spacing

3.9

120

1080

Up to 38.4 kBaud data rate, 150 kHz channel

spacing

1.0

3.3

950

Up to 76.8 kBaud data rate, 200 kHz channel

spacing

0.2

1.5

150

700

Up to 153.6 kBaud data rate, 500 kHz channel

spacing

Table 25. Typical PLL turn-on time to within ±10% of channel spacing for different loop

filter bandwidths

15.4. PLL Lock Time versus Loop Filter Bandwidth

If calibration has been performed the PLL

lock time is the time needed for the PLL to

lock to the desired frequency when going

from RX to TX mode or vice versa. The

PLL lock time depends on the PLL loop

filter bandwidth. Table 26 gives the PLL

lock time for different PLL loop filter

bandwidths.

PLL lock time

[us]

[nF]

[pF]

[kΩ]

Comment

220

8200

2200

1.5

4.7

900

180

1300

Up to 4.8 kBaud data rate, 12.5 kHz channel

spacing

100

3900

1000

2.2

6.8

640

270

830

Up to 4.8 kBaud data rate, 25 kHz channel

spacing

2200

560

3.3

400

140

490

Up to 9.6 kBaud data rate, 50 kHz channel

spacing

560

150

5.6

140

230

Up to 19.2 kBaud data rate, 100 kHz channel

spacing

3.9

120

180

Up to 38.4 kBaud data rate, 150 kHz channel

spacing

1.0

3.3

Up to 76.8 kBaud data rate, 200 kHz channel

spacing

0.2

1.5

150

Up to 153.6 kBaud data rate, 500 kHz channel

spacing

Table 26. Typical PLL lock time to within ±10% of channel spacing for different loop filter

bandwidths. 1) 307.2 kHz step, 2) 1 channel step, 3) 1 MHz step

16.

VCO and LNA Current Control

The VCO current is programmable and

should be set according to operating

frequency, RX/TX mode and output power.

Recommended

settings

for

the

VCO_CURRENT bits in the VCO register

are shown in the register overview and

also given by SmartRF® Studio. The VCO

current

for

frequency

FREQ_A

and

FREQ_B

can

programmed

independently.

The bias currents for the LNA, mixer and

the

and

buffers

are

also

programmable. The FRONTEND and the

BUFF_CURRENT registers control these

currents.

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