CC1070-RTR1 datasheet(32/57 Pages) TI2

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CC1070

SWRS043A

Page 32 of 54

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

filter bandwidths

14.4 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 one transmit frequency to the next by

changing the F_REG bit in the MAIN

the PLL loop filter bandwidth. Table 20

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

180

1300

Up to 4.8 kBaud data rate, 12.5 kHz channel

spacing

100

3900

1000

2.2

6.8

270

830

Up to 4.8 kBaud data rate, 25 kHz channel

spacing

2200

560

3.3

140

490

Up to 9.6 kBaud data rate, 50 kHz channel

spacing

560

150

5.6

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

bandwidths. 1) 1 channel step, 2) 1 MHz step

15 VCO Current Control

The VCO current is programmable and

should be set according to operating

frequency

and

output

power.

Recommended

settings

for

the

VCO_CURRENT bits in the VCO register

are shown in the register overview (page

40) and also given by SmartRF® Studio.

The VCO current for frequency FREQ_A

and

FREQ_B

can

programmed

independently.

The bias current for the PA buffers is also

programmable.

The

BUFF_CURRENT

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