CC2420 Chipcon AS, CC2420 Datasheet - Page 74

• Manufacturer Part Number: CC2420
• Description: 2.4 GHz RF Transceiver for IEEE 802.15.4 and ZigBee
• Manufacturer: Chipcon AS

AGCTST0 (0x24) - AGC Test Register 0
Bit
15:12
11:6
5:0
AGCTST1 (0x25) - AGC Test Register 1
Bit
15
14
13
12:11
10:8
7:6
5:0
AGCTST2 (0x26) - AGC Test Register 2
Bit
15:10
9:5
4:0
Chipcon AS SmartRF ® CC2420 Preliminary Datasheet (rev 1.0), 2003-11-17
Field Name
LNAMIX_HYST[3:0]
LNAMIX_THR_H[5:0]
LNAMIX_THR_L[5:0]
Field Name
-
AGC_BLANK_MODE
PEAKDET_CUR_BOOST
AGC_SETTLE_WAIT[1:0]
AGC_PEAK_DET_MODE
[2:0]
AGC_WIN_SIZE[1:0]
AGC_REF[5:0]
Field Name
-
MED2HIGHGAIN[4:0]
LOW2MEDGAIN[4:0]
3
25
9
0
0
1
1
20
9
10
Reset
Reset
0
0
Reset
0
R/W
R/W
R/W
R/W
R/W
W0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
W0
R/W
R/W
SmartRF
Description
Hysteresis on the switching between different RF frontend gain
modes, defined in 2 dB steps
Threshold for switching between medium and high RF frontend
gain mode, defined in 2 dB steps
Threshold for switching between low and medium RF frontend
gain mode, defined in 2 dB steps
Description
Reserved, write as 0
Set the VGA blanking mode when switching out a gainstage
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 /
Bit 0 : Analog varliable gain stage peak detector enable /
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.
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 frontend 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 frontend gain mode.
disable
disable
®
CC2420
Page 74 of 85