CC1021-RTR1 datasheet(69/91 Pages) TI1

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CC1021

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SWRS045D – JANUARY 2006 – REVISED JANUARY 2015

Table 5-36. VGA2 Register (12h) (continued)

DEFAULT

NAME

ACTIVE

DESCRIPTION

VALUE

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 or 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.

Table 5-37. VGA3 Register (13h)

DEFAULT

NAME

ACTIVE

DESCRIPTION

VALUE

VGA3[7:5]

VGA_DOWN[2:0]

—

Decides how much the signal strength must be above

CS_LEVEL+VGA_UP before VGA gain is decreased.

0: Gain is decreased 4.5 dB above CS_LEVEL+ VGA_UP

1: Gain is decreased 6 dB above CS_LEVEL+ VGA_UP

…

6: Gain is decreased 13.5 dB above CS_LEVEL+ VGA_UP

7: Gain is decreased 15 dB above CS_LEVEL+ VGA_UP

See Figure 5-17 for an explanation of the relationship between

RSSI, AGC and carrier sense settings.

VGA3[4:0]

VGA_SETTING[4:0]

VGA setting to be used when receive chain is turned on

This is also the maximum gain that the AGC is allowed to use.

See Figure 5-17 for an explanation of the relationship between

RSSI, AGC and carrier sense settings.

Detailed Description

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