CC1021-RTR1 datasheet(72/91 Pages) TI1

72 / 91 page

Not Recommended for New Designs NRND

CC1021

SWRS045D – JANUARY 2006 – REVISED JANUARY 2015

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Table 5-41. ANALOG Register (17h) (continued)

DEFAULT

NAME

ACTIVE

DESCRIPTION

VALUE

ANALOG[1:0]

DIV_BUFF_CURRENT[1:0]

—

Overall bias current adjustment for VCO divider and buffers

0: 4/6 of nominal VCO divider and buffer current

1: 4/5 of nominal VCO divider and buffer current

2: Nominal VCO divider and buffer current

3: 4/3 of nominal VCO divider and buffer current

Recommended setting: DIV_BUFF_CURRENT=3

Table 5-42. BUFF_SWING Register (18h)

DEFAULT

NAME

ACTIVE

DESCRIPTION

VALUE

BUFF_SWING[7:6]

PRE_SWING[1:0]

—

Prescaler swing.

0: 2/3 of nominal swing

1: 1/2 of nominal swing

2: 4/3 of nominal swing

3: Nominal swing

Recommended setting: PRE_SWING=0.

BUFF_SWING[5:3]

RX_SWING[2:0]

—

LO buffer swing, in RX (to mixers)

0: Smallest load resistance (smallest swing)

…

7: Largest load resistance (largest swing)

Recommended setting: RX_SWING=2.

BUFF_SWING[2:0]

TX_SWING[2:0]

—

LO buffer swing, in TX (to power amplifier driver)

0: Smallest load resistance (smallest swing)

…

7: Largest load resistance (largest swing)

Recommended settings:

TX_SWING=4 for 402 to 470 MHz,

TX_SWING=0 for 804 to 960 MHz.

Table 5-43. BUFF_CURRENT Register (19h)

DEFAULT

NAME

ACTIVE

DESCRIPTION

VALUE

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 to 470 MHz,

TX_CURRENT=5 for 804 to 960 MHz.

Detailed Description

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