CC1021 datasheet(52/94 Pages) TI

52 / 94 page

CC1021

SWRS045C

Page 52 of 87

End of calibration

Wait for T

≥100 us

Calibrate RX frequency register A

(to calibrate TX frequency register

B write MAIN register = D1h).

Write MAIN register = 11h:

RXTX=0, F_REG=0, PD_MODE=1,

FS_PD=0, CORE_PD=0, BIAS_PD=0,

RESET_N=1

Write FREQ_A, FREQ_B, VCO,

CLOCK_A and CLOCK_B registers.

PLL_BW = 174 + 16log

2(fref/7.126)

Start single calibration

Write CALIBRATE register = B4h

Start calibration

ref is the reference frequency (in

MHz)

Yes

Read STATUS register and wait until

LOCK_CONTINUOUS=1

Read STATUS register and wait until

CAL_COMPLETE=1

Calibration OK?

End of calibration

Wait for T

≥100 us

Calibrate RX frequency register A

(to calibrate TX frequency register

B write MAIN register = D1h).

Write MAIN register = 11h:

RXTX=0, F_REG=0, PD_MODE=1,

FS_PD=0, CORE_PD=0, BIAS_PD=0,

RESET_N=1

Write FREQ_A, FREQ_B, VCO,

CLOCK_A and CLOCK_B registers.

PLL_BW = 174 + 16log

2(fref/7.126)

Start single calibration

Write CALIBRATE register = B4h

Start calibration

ref is the reference frequency (in

MHz)

Yes

Read STATUS register and wait until

LOCK_CONTINUOUS=1

Read STATUS register and wait until

CAL_COMPLETE=1

Calibration OK?

Figure 29. Single calibration algorithm for RX and TX

15.3. PLL Turn-on Time versus Loop Filter Bandwidth

If calibration has been performed the PLL

turn-on time is the time needed for the PLL

to lock to the desired frequency when

going from power down mode (with the

crystal oscillator running) to TX or RX

mode. The PLL turn-on time depends on

the PLL loop filter bandwidth. Table 25

gives the PLL turn-on time for different

PLL loop filter bandwidths.

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