Texas Instruments AFE79 Series User Manual

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112
SBAU337–May 2020
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Macro
Table 1-59. (continued)
Macro AGC Detector Time Constant
3 0x04 3 Time Constant Small Step Attack
Time Constant
(slow attack) (1 LSB
= 10 ns)
4 0x07 3 Time Constant Decay Time
Constant (1 LSB =
10 ns)
Memory Not used
The time constant values that are present here are interpreted in absolute time with the least value
corresponding to 10 ns. The maximum allowed value for the time constant is 40 milliseconds.
In case of setting the attack time constants, two different time constants are supported, one for the fast
attack (big step attack) and other for the slow attack (small step attack). The same value that is
programmed for the fast attack will be used for the LNA RF Detector. The same value that is programmed
for the slow attack will be used for the band detector in attack Mode if enabled.
For the decay time constants, there is a single value that can be given through this macro and this value
will be used for all the decay detectors that are enabled.
1.2.5.3 AGC Digital Detector Relative Time Crossing Macro
Table 1-60.
Macro AGC Digital Detector Relative Time Crossing
Opcode 0x5A
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
2 0x01 2 Fraction of samples
crossing signal
threshold in given
time constant for
Big Step Attack
detector to declare
attack

Texas Instruments AFE79 Series Specifications

General

Brand	Texas Instruments
Model	AFE79 Series
Category	Control Unit
Language	English