CC1021 datasheet(79/94 Pages) TI

79 / 94 page

CC1021

SWRS045C

Page 79 of 87

BUFF_CURRENT Register (19h)

NAME

Default

value

Active

Description

BUFF_CURRENT[7:6]

PRE_CURRENT[1:0]

Prescaler current scaling

0: Nominal current

1: 2/3 of nominal current

2: 1/2 of nominal current

3: 2/5 of nominal current

Recommended setting: PRE_CURRENT=0.

BUFF_CURRENT[5:3]

RX_CURRENT[2:0]

LO buffer current, in RX (to mixers)

0: Minimum buffer current

…

7: Maximum buffer current

Recommended setting: RX_CURRENT=4.

BUFF_CURRENT[2:0]

TX_CURRENT[2:0]

LO buffer current, in TX (to PA driver)

0: Minimum buffer current

…

7: Maximum buffer current

Recommended settings:

TX_CURRENT=2 for 402-470 MHz,

TX_CURRENT=5 for 804-960 MHz.

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 = 174 + 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 calibration wait time (affects accuracy)

0 (00): Calibration time is approx. 90000 F_REF periods

1 (01): Calibration time is approx. 110000 F_REF periods

2 (10): Calibration time is approx. 130000 F_REF periods

3 (11): Calibration time is approx. 200000 F_REF periods

Recommended setting: CAL_WAIT=3 for best accuracy in

calibrated PLL loop filter bandwidth.

CALIBRATE[3]

Reserved, write 0

CALIBRATE[2:0]

CAL_ITERATE[2:0]

Iteration start value for calibration DAC

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

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

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

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

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

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

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

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

Recommended setting: CAL_ITERATE=4.

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