EVAL-ADF7021DBZ5 Datasheet, PDF (56/64 Pages) Analog Devices – High Performance Narrow-Band Transceiver IC

ADF7021
REGISTER 9—AGC REGISTER
FILTER_ LNA_ AGC_
GAIN GAIN MODE
AGC_HIGH_THRESHOLD
Data Sheet
AGC_LOW_THRESHOLD
ADDRESS
BITS
ML1 MIXER LINEARITY
0 DEFAULT
1 HIGH
LI2 LI1 LNA BIAS
0 0 800µA (DEFAULT)
LG1 LNA MODE
0 DEFAULT
1 REDUCED GAIN
FI1 FILTER CURRENT
0 LOW
1 HIGH
FG2 FG1 FILTER GAIN
008
0 1 24
1 0 72
1 1 INVALID
AGC MODE
0 AUTO AGC
1 MANUAL AGC
2 FREEZE AGC
3 RESERVED
AGC LOW
GL7 GL6 GL5 GL4 GL3 GL2 GL1 THRESHOLD
00000011
00000102
00000113
00001004
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1 1 1 1 1 0 1 61
1 1 1 1 1 1 0 62
1 1 1 1 1 1 1 63
AGC HIGH
GH7 GH6 GH5 GH4 GH3 GH2 GH1 THRESHOLD
00000011
00000102
00000113
00001004
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1 0 0 1 1 1 0 78
1 0 0 1 1 1 1 79
1 0 1 0 0 0 0 80
LG2 LG1 LNA GAIN
003
0 1 10
1 0 30
1 1 INVALID
Figure 71. Register 9—AGC Register Map
In receive mode, AGC is set to automatic AGC by default on
power-up. The default thresholds are AGC_LOW_THRESHOLD =
30 and AGC_HIGH_THRESHOLD = 70. See the RSSI/AGC
section for details. It is only necessary to program this register if
AGC settings, other than the defaults, are required.
AGC high and low settings must be more than 30 apart to
ensure correct operation.
An LNA gain of 30 is available only if LNA_MODE (DB25) is
set to 0.
Rev. B | Page 56 of 64