Datasheet
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SBAS253E − MAY 2003 − REVISED JULY 2006
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20
The input range of the comparators is limited. The lower voltage of the differential inputs should always be
within the range of 0 to AV
DD
−1.8V.
On every comparator, the output is delayed to the input voltage. This delay is dependent on the overdrive of
the comparator inputs. The overdrive is the input voltage (V
IN
) minus one-half of the hysteresis.
If the differential input voltage of the position sensor sign comparator is switching from –40mV to +40mV (step
function, 2.5mV overdrive), then the delay time of the output is typically 100ns. The delay is reduced to typically
25ns if the comparator is switching between –100mV and +100mV (72.5mV overdrive). For the delay times
as a function of step size with different overdrives, see Figure 1−7 and Figure 1−8.
Overdrive (mV)
Delay Time (ns)
100
80
60
40
20
0
2.5 12.5 22.5 32.5 42.5 52.5 62.5 72.5 82.5 92.5 102.5 112.5
Figure 1−7. Position Sensor Comparator Overdrive
Overdrive (mV)
Delay Time (ns)
100
80
60
40
20
0
5 10152025303540455055 6560
Figure 1−8. Current Sign Comparator Overdrive