A1308 Datasheet, PDF (1/12 Pages) Allegro MicroSystems – Linear Hall-Effect Sensor ICs with Analog Output Available in a Miniature, Low-Profile Surface-Mount Package

A1308 and A1309
Linear Hall-Effect Sensor ICs with Analog Output
Available in a Miniature, Low-Profile Surface-Mount Package
FEATURES AND BENEFITS
• 5 V supply operation
• QVO temperature coefficient programmed at Allegro^™ for
improved accuracy
• Miniature package options
• High-bandwidth, low-noise analog output
• High-speed chopping scheme minimizes QVO drift across
operating temperature range
• Temperature-stable quiescent voltage output and sensitivity
• Precise recoverability after temperature cycling
• Output voltage clamps provide short-circuit diagnostic
capabilities
• Undervoltage lockout (UVLO)
• Wide ambient temperature range:
–40°C to 150°C (SOT-23W), –40°C to 125°C (SIP)
• Immune to mechanical stress
• Enhanced EMC performance for stringent automotive
applications
PACKAGES:
3-pin SOT-23W
2 mm × 3 mm × 1 mm
(suffix LH)
3-pin ultramini SIP
1.5 mm × 4 mm × 3 mm
(suffix UA)
Not to scale
DESCRIPTION
New applications for linear output Hall-effect sensors, such
as displacement and angular position, require higher accuracy
and smaller package sizes. The Allegro A1308 and A1309
linear Hall-effect sensor ICs have been designed specifically
to meet both requirements. These temperature-stable devices
are available in both surface-mount and through-hole packages.
The accuracy of each device is enhanced via end-of-line
optimization. Each device features nonvolatile memory to
optimize device sensitivity and the quiescent voltage output
(QVO: output in the absence of a magnetic field) for a given
application or circuit. This A1308 and A1309 optimized
performance is sustained across the full operating temperature
range by programming the temperature coefficient for both
sensitivity and QVO at Allegro end-of-line test.
These ratiometric Hall-effect sensor ICs provide a voltage
output that is proportional to the applied magnetic field. The
quiescent voltage output is adjusted around 50% of the supply
voltage.
The features of these linear devices make them ideal for use in
automotive and industrial applications requiring high accuracy,
and they operate across an extended temperature range,
–40°C to 150°C (SOT-23W) or –40°C to 125°C (SIP).
Each BiCMOS monolithic circuit integrates a Hall element,
temperature-compensating circuitry to reduce the intrinsic
Continued on the next page…
V+
VCC
Functional Block Diagram
VOUT
C_BYPASS
Sensitivity and
Sensitivity TC
Offset and
Offset TC
A1308-9-DS, Rev. 7
GND
January 4, 2017