CC1021 datasheet(78/94 Pages) TI

78 / 94 page

CC1021

SWRS045C

Page 78 of 87

ANALOG Register (17h)

NAME

Default

value

Active

Description

ANALOG[7]

BANDSELECT

Frequency band selection

0: 402-470 MHz band

1: 804-960 MHz band

ANALOG[6]

LO_DC

Lower LO DC level to mixers

0: High LO DC level to mixers

1: Low LO DC level to mixers

Recommended settings:

LO_DC=1 for 402-470 MHz,

LO_DC=0 for 804-960 MHz.

ANALOG[5]

VGA_BLANKING

Enable analog blanking switches in VGA when

changing VGA gain.

0: Blanking switches are disabled

1: Blanking switches are turned on for approx.

0.8µs when gain is changed (always on if

AGC_DISABLE=1)

Recommended setting: VGA_BLANKING=0.

ANALOG[4]

PD_LONG

Selects short or long reset delay in phase

detector

0: Short reset delay

1: Long reset delay

Recommended setting: PD_LONG=0.

ANALOG[3]

Reserved, write 0

ANALOG[2]

PA_BOOST

Boost PA bias current for higher output power

Recommended setting: PA_BOOST=1.

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

BUFF_SWING Register (18h)

NAME

Default

value

Active

Description

BUFF_SWING[7:6]

PRE_SWING[1:0]

Prescaler swing. Fractions for PRE_CURRENT=0:

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 402-470 MHz,

TX_SWING=0 for 804-960 MHz.

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