A1230: Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar0 pages

A1230
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Features and Benefits

Description

▪ 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 chopperstabilization 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

The A1230 is a dual-channel, bipolar switch with two Halleffect 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.

Packages: 8-pin SOIC (suffix L), and
4-pin SIP (suffix K)

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
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Not to scale

Typical Application

VOUTPUTB
VOUTPUTA
2
OUTPUTA

VSupply

1

A1230
VCC

OUTPUTB

100
A
GND

0.1 μF
A Resistor is optional

depending on Conducted
Immunity requirements

Using regulated supply

A1230DS, Rev. 2

4

3