CC2400-RTR1 datasheet(43/84 Pages) TI2

43 / 84 page

CC2400

SWRS042A

Page 43 of 83

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-500 -450 -400 -350 -300 -250 -200 -150 -100 -50

100 150 200 250 300 350 400 450 500 550

Frequency offset [kHz]

AFC with settle = 8

AFC with settle = 4

AFC with settle = 2

AFC with settle = 1

Figure 21. AFC value vs. frequency offset

33 Linear IF and AGC Settings

CC2400 is based on a linear IF chain

where the signal amplification is done in

an analog VGA (variable gain amplifier).

The gain of the VGA is controlled by the

digital part of the IF-chain after the ADC

(Analog Digital Converter).

The AGC (Automatic Gain Control) loop

ensures that the ADC operates inside its

dynamic range by using an analog/digital

feedback loop.

The AGC characteristics are set through

the AGCCTRL, AGCTST0, AGCTST1 and

AGCTST2

registers.

Note that the RSSI function does not take

AGC settings into consideration if the AGC

settings are overridden.

CC2400-RTR1 数据表(PDF) 43 Page - Texas Instruments

CC2400-RTR1 数据表(HTML) 43 Page - Texas Instruments

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