Preliminary Technical Data UG-1828
Rev. PrB | Page 155 of 277
Parameter Description Min Value
Max
Value
Default
Value
(TBD)
agcUnderRangeHighInterval
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.
0 63 4
apdHighThresh
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.
apdLow
Thresh
63 21
apdLowThresh
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.
0 apdHigh
Thresh
12
apdUpperThreshPeakExceededCount
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.
0 255 6
apdLowerThreshPeakExceededCount
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.
0 255 3
apdGainStepAttack
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).
0 31 2
apdGainStepRecovery
The number of indices that the gain index pointer
should be increased in the event of an APD Under
range event occurring in Peak Detect AGC mode. The
step size in dB depends on the gain step resolution of
the gain table (default 0.5dB per index step).
0 31 0
enableHbOverload 1: HB Overload Detector enabled
0: HB Overload Detector disabled
0 1 1
hbOverloadDurationCount
The number of clock cycles (at the HB output rate)
within which hbOverloadThreshCnt must be
exceeded for an overload to occur. A HB overload flag
is only raised when the number of these overloads
exceeds hbUpperThreshPeakExceededCnt or
hbLowerThreshPeakExceededCnt within a gain
update period.
0 7 1
hbOverloadThreshCount
Sets the number of individual samples exceeding
hbHighThresh or hbLowThresh necessary within
hbOverloadDurationCnt for an overload to occur. The
HB overload flag will only be raised when the number
of these overloads exceeds
hbUpperThreshPeakExceededCnt or
hbLowerThreshPeakExceededCnt within a gain
update period.
1 15 1
hbHighThresh This sets the upper threshold of the HB detector. 0 16383 13044
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