CC1021 datasheet(74/94 Pages) TI

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CC1021

SWRS045C

Page 74 of 87

VGA2 Register (12h)

NAME

Default

value

Active

Description

VGA2[7]

LNA2_MIN

Minimum LNA2 setting used in VGA

0: Minimum LNA2 gain

1: Medium LNA2 gain

Recommended setting: LNA2_MIN=0 for best selectivity.

VGA2[6]

LNA2_MAX

Maximum LNA2 setting used in VGA

0: Medium LNA2 gain

1: Maximum LNA2 gain

Recommended setting: LNA2_MAX=1 for best sensitivity.

VGA2[5:4]

LNA2_SETTING[1:0]

Selects at what VGA setting the LNA gain should be

changed

0: Apply LNA2 change below min. VGA setting.

1: Apply LNA2 change at approx. 1/3 VGA setting (around

VGA setting 10).

2: Apply LNA2 change at approx. 2/3 VGA setting (around

VGA setting 19).

3: Apply LNA2 change above max. VGA setting.

Recommended setting:

LNA2_SETTING=0 if VGA_SETTING<10,

LNA2_SETTING=1 otherwise.

If LNA2_MIN=1 and LNA2_MAX=0, then the LNA2 setting is

controlled by LNA2_SETTING:

0: Between medium and maximum LNA2 gain

1: Minimum LNA2 gain

2: Medium LNA2 gain

3: Maximum LNA2 gain

VGA2[3]

AGC_DISABLE

Disable AGC

0: AGC is enabled

1: AGC is disabled (VGA_SETTING determines VGA gain)

Recommended setting: AGC_DISABLE=0 for good dynamic

range.

VGA2[2]

AGC_HYSTERESIS

Enable AGC hysteresis

0: No hysteresis. Immediate gain change for smallest

up/down step

1: Hysteresis enabled. Two samples in a row must indicate

gain change for smallest up/down step

Recommended setting: AGC_HYSTERESIS=1.

VGA2[1:0]

AGC_AVG[1:0]

Sets how many samples that are used to calculate average

output magnitude for AGC/RSSI.

0: Magnitude is averaged over 2 filter output samples

1: Magnitude is averaged over 4 filter output samples

2: Magnitude is averaged over 8 filter output samples

3: Magnitude is averaged over 16 filter output samples

Recommended setting: AGC_AVG=1.

For best AGC/RSSI accuracy AGC_AVG=3.

For automatic power-up sequencing, the AGC_AVG and

CS_SET values must be chosen so that carrier sense is

available in time to be detected before the chip re-enters

power-down.

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