A1230_16 Datasheet, PDF (1/17 Pages) Allegro MicroSystems – Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch

A1230
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
FEATURES AND BENEFITS
• AEC-Q100 automotive qualified
• Two matched Hall-effect switches on a single substrate
• 1 mm Hall element spacing
• Superior temperature stability and industry-leading
jitter performance through use of advanced chopper-
stabilization topology
• Integrated regulator provides 3.3 V operation
• Integrated ESD protection from outputs and VCC to
ground
• High-sensitivity switchpoints
• Robust structure for EMC protection
• Solid-state reliability
• Reverse-battery protection on supply and both output
pins
PACKAGES:
8-Pin SOIC (suffix L)
4-Pin SIP (suffix K)
Not to scale
DESCRIPTION
The A1230 is a dual-channel, bipolar switch with two Hall-
effect sensing elements, each providing a separate digital
output for speed and direction signal processing capability. The
Hall elements are photolithographically aligned to better than
1 µm. Maintaining accurate mechanical location between the
two active Hall elements eliminates the major manufacturing
hurdle encountered in fine-pitch detection applications. The
A1230 is a highly sensitive, temperature-stable magnetic
sensing device ideal for use in ring magnet based, speed and
direction systems located in harsh automotive and industrial
environments.
The A1230 monolithic integrated circuit (IC) contains two
independent Hall-effect bipolar switches located 1 mm apart.
The digital outputs are out of phase so that the outputs are in
quadrature when interfaced with the proper ring magnet design.
This allows easy processing of speed and direction signals.
Extremely low-drift amplifiers guarantee symmetry between
the switches to maintain signal quadrature. The Allegro^™
patented, high-frequency chopper stabilization technique
cancels offsets in each channel providing stable operation over
the full specified temperature and voltage ranges.
Additionally, the high-frequency chopping circuits allow
an increased analog signal-to-noise ratio at the input of the
digital comparators internal to the IC. As a result, the A1230
Continued on the next page…
V_Supply
100 Ω
A
A ^{Resistor is optional}
depending on Conducted
Immunity requirements
2
OUTPUTA
1
A1230
3
VCC
OUTPUTB
GND
0.1 µF
4
VOUTPUTB
VOUTPUTA
A1230DS, Rev. 6
Typical Application using Regulated Supply