CC1021 datasheet(53/94 Pages) TI

53 / 94 page

CC1021

SWRS045C

Page 53 of 87

Loop

filter no.

[nF]

[pF]

[kΩ]

PLL turn-on time

[us]

Comment

2200

560

3.3

1400

Up to 9.6 kBaud data rate.

±5 kHz settling accuracy

560

150

5.6

1300

Up to 19.2 kBaud data rate.

±10 kHz settling accuracy

3.9

120

1080

Up to 38.4 kBaud data rate.

±15 kHz settling accuracy

1.0

3.3

950

Up to 76.8 kBaud data rate.

±20 kHz settling accuracy

0.2

1.5

150

700

Up to 153.6 kBaud data rate.

±50 kHz settling accuracy

Table 25. Typical PLL turn-on time to within specified accuracy 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]

Loop

filter

no.

[nF]

[pF]

[kΩ]

Comment

2200

560

3.3

400

140

(50 kHz)

490

Up to 9.6 kBaud data rate.

±5 kHz settling accuracy

560

150

5.6

140

(100 kHz)

230

Up to 19.2 kBaud data rate.

±10 kHz settling accuracy

3.9

120

(150 kHz)

180

Up to 38.4 kBaud data rate.

±15 kHz settling accuracy

1.0

3.3

(200 kHz)

Up to 76.8 kBaud data rate.

±20 kHz settling accuracy

0.2

1.5

150

(500 kHz)

Up to 153.6 kBaud data rate.

±50 kHz settling accuracy

Table 26. Typical PLL lock time to within specified accuracy for different loop filter

bandwidths. 1) 307.2 kHz step, 2) step as given in brackets, 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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