Analog Devices ADRV9001 User Manual page 174

UG-1828
Parameter
feedback_apd_high_apd_low
Table 73. adi_adrv9001_PeakDetector_t Structure Definition
Parameter
agcUnderRangeLowInterval
agcUnderRangeMidInterval
agcUnderRangeHighInterval
apdHighThresh
apdLowThresh
apdUpperThreshPeakExceededCount
apdLowerThreshPeakExceededCount
apdGainStepAttack
Description
A pair of DGPIO pins to retrieve the apd detector low threshold
counter exceeded status and apd high threshold counter
exceeded status
Description
This sets the time constant (in AGC clock cycles) that
the AGC will recover when the signal peaks are less
than hbUnderRangeLowThresh. Only applicable
when the fast recovery option is enabled in Peak
Detect AGC mode.
This sets the time constant (in AGC clock cycles) that
the AGC will recover when the signal peaks are less
than hbUnderRangeMidThresh. Calculated as
(underRangeMidInterval+1) ×
underRangeLowInterval. Only applicable when the
fast recovery option is enabled in Peak Detect AGC
mode.
This sets the time constant (in AGC clock cycles) that
the AGC will recover when the signal peaks are less
than hbUnderRangeHighThresh. Calculated as
(underRangeHighInterval+1) *
underRangeMidInterval.
Only applicable when the fast recovery option is
enabled in Peak Detect AGC mode.
This sets the upper threshold of the analog peak
detector. When the input signal exceeds this
threshold a programmable number of times (set by
its corresponding overload counter) within a gain
update period, the overload detector flags. In AGC
modes, the gain will be reduced when this overload
occurs.
This sets the lower threshold of the analog peak
detector. When the input signal exceeds this
threshold a programmable number of times (set by
its corresponding overload counter) within a gain
update period, the overload detector flags. In Peak
AGC mode, the gain is increased when this overload
is not occurring. In Power AGC mode, this threshold
can be used to prevent further gain increases if the
lowThreshPreventGainInc bit is set.
Sets number of peaks to detect above
apdHighThresh to cause an APD High Over Range
Event. In AGC modes, this will result in a gain
decrement set by apdGainStepAttack.
Sets number of peaks to detect above
apdLowThresh to cause an APD Low Overload
Event. In Peak Detect AGC mode, if an APD Low
Overload Event is not occurring then this will result
in a gain increment set by apdGainStepRecovery.
The number of indices that the gain index pointer
should be decreased in the event of an APD High
Over Range in AGC modes. The step size in dB
depends on the gain step resolution of the gain
table (default 0.5dB per index step).
Rev. PrC | Page 174 of 338
Preliminary Technical Data
Max
Min
Value Value
0 9
(not (Select
assigned) DGPIO
pins 14
and 15)
Max
Min Value Value
Depends 65535
on hb
detector
settings
0 63
0 63
apdLow 63
Thresh
0 apdHigh
Thresh
0 255
0 255
0 31
Default
Value
0
(not
assigned)
Default
Value
(TBD)
50
2
4
21
12
6
3
2