A1351
High Precision Linear Hall Effect Sensor IC
with a Push/Pull, Pulse Width Modulated Output
3
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Continued on the next page&
OPERATING CHARACTERISTICS valid over full operating temperature range, T
A
; C
BYPASS
= 0.1 糉, V
CC
= 5 V, unless otherwise speci ed
Characteristic
Symbol
Test Conditions
Min.   Typ.  Max.  Units
Electrical Characteristics
Supply Voltage
V
CC
4.5    5.0    5.5    V
Supply Current
I
CC
No load on PWMOUT
    6.7    10   mA
Parasitic Current
I
PAR
V
CC
= 0 V, GND = 0 V
0
    mA
Power On Time
1
t
PO
T
A
= 25癈, C
L
(of test probe) = 10 pF, Sens =
0.095% D/G, C
BYPASS
= open
    25        ms
Internal Bandwidth
BW
i
Small signal 3 dB, 100 G
(P-P)
magnetic input
signal, C
L
= 10 nF
    150        Hz
Chopping Frequency
2
f
C
T
A
= 25癈
    220        kHz
Output Characteristics
Transient Current
I
OUT(SINK)
PWMOUT to VCC
    7.8        mA
I
OUT(SOURCE)
PWMOUT to GND
    4.1        mA
Output Voltage Levels
V
OUT(HIGH)
I
OUT(SOURCE)
= 1 mA
4.8    
    V
V
OUT(LOW)
I
OUT(SINK)
= 2.5 mA
    0.2    V
Rise Time
3
t
r
R
L(PULLUP)
= 2.35 k? C
L
= 14.7 nF
    9.5        約
Fall Time
3
t
f
R
L(PULLUP)
= 2.35 k? C
L
= 14.7 nF
7
    約
Response Time
1
t
RESPONSE
T
A
= 25癈, C
L
(of test probe) = 10 pF, Impulse
magnetic field of 420 G, Sens = 0.095% D/G
    25        ms
Settling Time After Removal of Overload
Magnetic Field
1
t
SETTLE
T
A
= 25癈, Primary Overload > 5000 G
    25        ms
Clamp Duty Cycles
D
CLP(HIGH)
T
A
= 25癈, B = 530 G, Sens = 0.095% D/G,
R
L(PULLDOWN)
= 10 k?/DIV>
90    92    95   % D
D
CLP(LOW)
T
A
= 25癈, B = -530 G, Sens = 0.095% D/G,
R
L(PULLUP)
= 10 k?/DIV>
5
8    10   % D
Duty Cycle Jitter
1, 4
Jitter
PWM
T
A
= 10癈 to 65癈, Sens = 0.095% D/G,
measured over 1000 output PWM clock
periods
   ?.05      % D
Duty Cycle Resolution
Res
PWM
T
A
= 10癈 to 65癈, Sens = 0.095% D/G,
measured over 1000 output PWM clock
periods
    ?.5        G
Load Resistance
R
L(PULLUP)
PWMOUT to VCC
2
    k?/DIV>
R
L(PULLDWN)
PWMOUT to GND
4.8    
    k?/DIV>
Load Capacitance
C
L
PWMOUT to GND
    14.7   nF
Pre-Programming Target
5
Pre-Programming Quiescent Duty Cycle
Output
D
(Q)PRE
B = 0 G, T
A
= 25癈
    52       % D
Pre-Programming Sensitivity
Sens
PRE
T
A
= 25癈
   0.045      % D/G
Pre-Programming PWM Output Carrier
Frequency
f
PWMPRE
T
A
= 25癈
    170        Hz
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