The A1233 is a dual-channel Hall-effect sensor IC ideal for use in speed and direction sensing applications incorporating encoder ring-magnet targets. The A1233 provides various output signals that indicate speed and direction of target rotation. The Hall elements are both photolithographically aligned to better than 1 μm. Maintaining accurate displacement between the two active Hall elements eliminates the major manufacturing hurdle encountered in fine-pitch detection applications. The A1233 is a highly sensitive, temperature-stable magnetic device ideal for use in harsh automotive and industrial environments.
The Hall elements of the A1233 are spaced 1.63 mm apart, which provides excellent speed and direction information for small-geometry targets. Extremely low-drift amplifiers guarantee symmetry between the switches to maintain signal quadrature. An on-chip regulator allows the use of this device over a wide operating voltage range of 3.5 to 24 V.
End-of-line trimming of the Hall element switchpoints provides tight matching capability. The Allegro® patented, highfrequency chopper-stabilization technique cancels offsets in each channel, providing stable operation over the full specified temperature and voltage ranges.
The A1233 has integrated protection against transients on the supply and output pins and short-circuit protection on all outputs.
The A1233 is available in a 4-pin SIP and a plastic 8-pin SOIC surface mount package. Both packages are lead (Pb) free, with 100% matte tin leadframe plating.
