Datasheet

Linear Hall Effect Sensor ICs with Analog Output
A1324, A1325,
and A1326
3
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
OPERATING CHARACTERISTICS Valid throughout T
A
range, C
BYPASS
= 0.1 μF, V
CC
= 5 V; unless otherwise noted
Characteristics Symbol Test Conditions Min. Typ. Max. Unit
1
Electrical Characteristics
Supply Voltage V
CC
4.5 5.0 5.5 V
Supply Current I
CC
No load on VOUT – 6.9 9 mA
Power-On Time
2
t
PO
T
A
= 25°C, C
L
(PROBE) = 10 pF – 32 – μs
Supply Zener Clamp Voltage V
Z
T
A
= 25°C, I
CC
= 12 mA 6 8.3 – V
Internal Bandwidth BW
i
Small signal, –3 dB – 17 – kHz
Chopping Frequency
3
f
C
T
A
= 25°C – 400 – kHz
Output Characteristics
Quiescent Voltage Output V
OUT(Q)
B = 0 G, T
A
= 25°C 2.425 2.500 2.575 V
Output Referred Noise V
N
A1324, T
A
= 25°C, C
BYPASS
= 0.1 μF – 7.0 – mV
(p-p)
A1325, T
A
= 25°C, C
BYPASS
= 0.1 μF – 4.4 – mV
(p-p)
A1326, T
A
= 25°C, C
BYPASS
= 0.1 μF – 3.5 – mV
(p-p)
Input Referred RMS Noise Density V
NRMS
T
A
= 25°C, C
BYPASS
= open, no load on VOUT,
f << BW
i
– 1.3 – mG/√Hz
DC Output Resistance R
OUT
–< 1– Ω
Output Load Resistance R
L
VOUT to VCC 4.7 – – kΩ
VOUT to GND 4.7 – – kΩ
Output Load Capacitance C
L
VOUT to GND – – 10 nF
Output Saturation Voltage
V
OUT(sat)HIGH
R
PULLDOWN
= 4.7 kΩ, V
CC
= 5 V 4.7 – – V
V
OUT(sat)LOW
R
PULLUP
= 4.7 kΩ, V
CC
= 5 V – – 0.30 V
Magnetic Characteristics
Sensitivity Sens
A1324, T
A
= 25°C 4.750 5.000 5.250 mV/G
A1325, T
A
= 25°C 2.969 3.125 3.281 mV/G
A1326, T
A
= 25°C 2.375 2.500 2.625 mV/G
Sensitivity Temperature Coefficient TC
Sens
LH package; programmed at T
A
= 150°C,
calculated relative to Sens at 25°C
– 0 – %/°C
UA package; programmed at T
A
= 150°C,
calculated relative to Sens at 25°C
– 0.03 – %/°C
Error Components
Sensitivity Drift at Maximum Ambient
Operating Temperature
∆Sens
(TAmax)
LH package; from hot to room temperature –5 – 5 %
UA package; from hot to room temperature –2.5 – 7.5 %
Sensitivity Drift at Minimum Ambient
Operating Temperature
∆Sens
(TAmin)
LH package; from cold to room temperature –3.5 – 8.5 %
UA package; from cold to room temperature –6 – 4 %
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