Texas Instruments AFE79 Series - 1.2.5.14 AGC External LNA Gain Control Configuration Macro

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124
SBAU337–May 2020
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Macro
Table 1-72. (continued)
Macro AGC Customer RF
5 0x04 4 For Absolute
Number of samples
at FADC for
customer RF
detector.
For Relative
Fraction of samples
crossing signal
threshold in given
time constant for
customer RF
detector (This
fraction is
interpreted as a 32-
bit precision value
with the value 2
32
corresponding to
100%).
6 0x08 1 Detector Threshold
in dBFs(When
Mode = 0x1: very
big step attack)
Detector Threshold
in dBm(When Mode
= 0x0 or 0x2)
7 0x09 1 Step size(When
Mode is 0x1: very
big step attack)
1.2.5.14 AGC External LNA Gain Control Configuration Macro
The LNA gain and phase can be specified through this macro. If external LNA gain does not change with
temperature then single LNA gain phase value needs to be specified in the operands. If external LNA gain
changes with temperature then LNA gain phase values for the start temperature, start temperature + k ×
(step temperature) where k=[0:Number of steps-1] needs to be specified in the macro memory.
Table 1-73.
Macro AGC External LNA Gain Control Configuration Macro
Opcode 0x66
Operand Offset Length Value Functionality Results
1 0x00 1 RX Channel Select Bit 0: 1 → Value
specified in
subsequent
operands is valid for
1RX.
Bit 1: 1 → Value
specified in
subsequent
operands is valid for
2RX.
Bit 2: 1 → Value
specified in
subsequent
operands is valid for
3RX.
Bit 3: 1 → Value
specified in
subsequent
operands is valid for
4RX.
Bit 4 → RESERVED
Bit 5 → RESERVED