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PDF A1230 Data sheet ( Hoja de datos )
| Número de pieza | A1230 | |
| Descripción | Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch | |
| Fabricantes | Allegro | |
| Logotipo |  |
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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…
VSupply
100 Ω
A
A Resistor is optional
depending on Conducted
Immunity requirements
2
OUTPUTA
1 A1230 3
VCC
OUTPUTB
0.1 µF
GND
4
VOUTPUTB
VOUTPUTA
A1230DS, Rev. 6
Typical Application using Regulated Supply
1 page  
A1230
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
EMC
Contact Allegro MicroSystems for EMC performance.
VCC
Channel A
Hall
Element
E1
Programmable
Trim
4 Bit
Regulator
Amp
Low-
Pass
Filter
2 Bit
Output
Drive
OUTPUTA
Channel B
Hall
Element
E2
Amp
Low-
Pass
Filter
2 Bit
Output
Drive
OUTPUTB
GND
Functional Block Diagram
Allegro MicroSystems, LLC
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5 Page 
A1230
Ultra-Sensitive Dual-Channel Quadrature
Hall-Effect Bipolar Switch
Chopper-Stabilized Technique
FUNCTIONAL DESCRIPTION
A limiting factor for switchpoint accuracy when using Hall effect
technology is the small signal voltage developed across the Hall
plate. This voltage is proportionally small relative to the offset
that can be produced at the output of the Hall IC. This makes it
difficult to process the signal and maintain an accurate, reliable
output over the specified temperature and voltage range.
Chopper-stabilization is a unique approach used to minimize
Hall offset on the chip. The Allegro patented technique, dynamic
quadrature offset cancellation, removes key sources of the output
drift induced by temperature and package stress. This offset
reduction technique is based on a signal modulation-demodula-
tion process. The undesired offset signal is separated from the
magnetically induced signal in the frequency domain through
modulation. The subsequent demodulation acts as a modulation
process for the offset causing the magnetically induced signal
to recover its original spectrum at baseband while the DC offset
becomes a high frequency signal. Then, using a low-pass filter
the signal passes while the modulated DC offset is suppressed.
Allegro’s new innovative chopper-stabilization technique uses a
high frequency clock. This chopper-stabilization approach de-
sensitizes the IC to temperature and stress. The high-frequency
operation also allows a greater sampling rate that produces higher
accuracy and faster signal processing capability. Additionally,
filtering is more effective and results in a lower noise analog
signal at the input to the Schmitt trigger. Therefore, this high-
frequency chopping technique reduces jitter, also known as 360°
repeatability, can be induced on the output signal. The sample-
and-hold process, used by the demodulator to store and recover
the signal, can slightly degrade the signal to noise ratio. This is
because the process generates replicas of the noise spectrum at the
baseband, causing a decrease in jitter performance. However, the
improvement in switchpoint performance, resulting from the reduc-
tion of the effects of thermal and mechanical stress, outweighs the
degradation in the signal to noise ratio.
This technique produces devices that have an extremely stable
quiescent Hall output voltage, are immune to thermal stress,
and have precise recoverability after temperature cycling. This
technique is made possible through the use of a BiCMOS process
which allows the use of low offset and low noise amplifiers in
combination with high-density logic integration and sample and
hold circuits.
Regulator
Amp
Low-
Pass
Filter
Figure 1: Chopper Stabilization Circuit (Dynamic Quadrature Offset Cancellation)
Allegro MicroSystems, LLC
11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet A1230.PDF ] | |
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