CC2420 Datasheet, PDF (76/92 Pages) List of Unclassifed Manufacturers – 2.4 GHz IEEE 802.15.4 / ZigBee-ready RF Transceiver

CC2420
AGCTST0 (0x24) - AGC Test Register 0
Bit
Field Name
15:12 LNAMIX_HYST[3:0]
Reset R/W
3
R/W
11:6 LNAMIX_THR_H[5:0]
25
R/W
5:0
LNAMIX_THR_L[5:0]
9
R/W
Description
Hysteresis on the switching between different RF front-end
gain modes, defined in 2 dB steps
Threshold for switching between medium and high RF front-
end gain mode, defined in 2 dB steps
Threshold for switching between low and medium RF front-end
gain mode, defined in 2 dB steps
AGCTST1 (0x25) - AGC Test Register 1
Bit
Field Name
15
-
14
AGC_BLANK_MODE
Reset R/W
0
W0
0
R/W
13
PEAKDET_CUR_BOOST
0
R/W
12:11 AGC_SETTLE_WAIT[1:0] 1
R/W
10:8 AGC_PEAK_DET_MODE
0
R/W
[2:0]
7:6
AGC_WIN_SIZE[1:0]
1
R/W
5:0
AGC_REF[5:0]
20
R/W
Description
Reserved, write as 0
Set the VGA blanking mode when switching out a gain stage
When VGA_GAIN_OE = 0:
0 : Blanking is performed when the AGC algorithm switches
out one or more 14dB gain stages.
1 : Blanking is never performed.
When VGA_GAIN_OE = 1:
Blanking is performed when AGC_BLANK_MODE=1
Doubles the bias current in the peak-detectors in-between the
VGA stages when set.
Timing for AGC to wait for analog gain to settle.
Sets the AGC mode for use of the VGA peak detectors:
Bit 2 : Digital ADC peak detector enable / disable
Bit 1 : Analog fixed stages peak detector enable /
disable
Bit 0 : Analog variable gain stage peak detector enable /
disable
Window size for the accumulate and dump function in the
AGC.
0 : 8 samples
1 : 16 samples
2 : 32 samples
3 : 64 samples
Target value for the AGC control loop, given in 2 dB steps.
Reset value corresponds to approximately 25% of the ADC
dynamic range in reception.
AGCTST2 (0x26) - AGC Test Register 2
Bit
15:10
9:5
Field Name
-
MED2HIGHGAIN[4:0]
Reset R/W
0
W0
9
R/W
4:0
LOW2MEDGAIN[4:0]
10
R/W
Description
Reserved, write as 0
MED2HIGHGAIN sets the difference in the receiver
LNA/MIXER gain from medium gain mode to high gain mode,
used by the AGC for setting the correct front-end gain mode.
LOW2MEDGAIN sets the difference in the receiver
LNA/MIXER gain from low gain mode to medium gain mode,
used by the AGC for setting the correct front-end gain mode.
SWRS041B
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