CC1070-RTY1 datasheet(48/57 Pages) TI2

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CC1070

SWRS043A

Page 48 of 54

PLL_BW Register (1Ah)

NAME

Default

value

Active

Description

PLL_BW[7:0]

134

Charge pump current scaling/rounding factor.

Used to calibrate charge pump current for the

desired PLL loop bandwidth. The value is given by:

PLL_BW = 146 + 16 log2(fref/7.126) where fref is the

reference frequency in MHz.

CALIBRATE Register (1Bh)

NAME

Default

value

Active

Description

CALIBRATE[7]

CAL_START

↑

↑ 1: Calibration started

0: Calibration inactive

CALIBRATE[6]

CAL_DUAL

Use calibration results for both frequency A and B

0: Store results in A or B defined by F_REG (MAIN[6])

1: Store calibration results in both A and B

CALIBRATE[5:4]

CAL_WAIT[1:0]

Selects dividers for clock used during calibration, and

thereby calibration wait time. Encoding when

CAL_SELECT = 1:

0 – divider 8

1 – divider 16

2 – divider 40

3 – divider 80

Encoding when CAL_SELECT = 0:

0 – divider 80

1 – divider 128

2 – divider 160

3 – divider 256

For CAL_SELECT = 0 this leads to:

0: Calibration time is approx. 90000 F_REF periods

1: Calibration time is approx. 110000 F_REF periods

2: Calibration time is approx. 130000 F_REF periods

3: Calibration time is approx. 200000 F_REF periods

Recommended setting:

CAL_WAIT=3 for best accuracy in calibrated PLL loop

filter bandwidth.

CALIBRATE[3]

CAL_SELECT

Selects calibration routine

0: CC1020 style calibration

1: New calibration routine (default)

Recommended setting: CAL_SELECT=1.

CALIBRATE[2:0]

CAL_ITERATE[2:0]

Iteration start value for calibration DAC

0 (000): DAC start value 1, VC<0.49V after calibration

1 (001): DAC start value 2, VC<0.66V after calibration

2 (010): DAC start value 3, VC<0.82V after calibration

3 (011): DAC start value 4, VC<0.99V after calibration

4 (100): DAC start value 5, VC<1.15V after calibration

5 (101): DAC start value 6, VC<1.32V after calibration

6 (110): DAC start value 7, VC<1.48V after calibration

7 (111): DAC start value 8, VC<1.65V after calibration

Recommended setting: CAL_ITERATE=4.

CC1070-RTY1 Datasheet(PDF) 48 Page - Texas Instruments

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