A1360, A1361,
and A1362
Propagation Delay Time (t
pd
) The time required for the device 
output to reflect a change in the applied magnetic field. Propaga-
tion delay can be considered as a fixed time offset and may be
compensated.
Applied Magnetic Field
Transducer Output
90
0
(%)
Propagation Delay Time, t
pd
t
Transducer Output
90
0
Response Time, t
RESPONSE
t
(%)
Applied Magnetic Field
Transducer Output
90
10
0
Rise Time, t
r
t
(%)
Applied Magnetic Field
Characteristic Definitions
Rise Time (t
r
) The time interval between a) when the device 
reaches 10% of its full scale value, and b) when it reaches 90%
of its full scale value. The rise time to a step response is used to
derive the bandwidth of the linear device, in which ?3 dB) =
0.35 / t
r
. Both t
r
 and t
RESPONSE
 are detrimentally affected by eddy
current losses observed in the conductive IC ground plane.
Response Time (t
RESPONSE
) The time interval between a) when 
the applied magnetic field reaches 90% of its final value, and b)
when the device reaches 90% of its output corresponding to the
applied magnetic field.
V
+t
V
CC
V
CC
(min.)
V
OUT
90% V
OUT
0
t
1
= time at which power supply reaches
  minimum specified operating voltage
t
2
= time at which output voltage settles
  within ?0% of its steady state value
  under an applied magnetic field
t
1
t
2
t
PO
V
CC
(typ.)
Power-On Time When the supply is ramped to its operating volt-
age, the device requires a finite time to power its internal com-
ponents before responding to an input magnetic field. Power-On
Time, t
PO
, is defined as: the time it takes for the output voltage
to settle within ?0% of its steady state value under an applied
magnetic field, after the power supply has reached its minimum
specified operating voltage, V
CC
(min), as shown in the following
chart.
Low-Noise Programmable Linear Hall Effect Sensor ICs with
Adjustable Bandwidth (50 kHz Maximum) and Analog Output
9
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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