Allegro’s A1233 monolithic integrated circuit (IC) contains two independent Hall-effect bipolar switches located 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. 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 A1233 achieves industry-leading digital output jitter performance that is critical in high performance motor commutation applications. An on-chip low dropout (LDO) regulator allows the use of this device over a wide operating voltage range. Post-assembly factory programming at Allegro provides sensitive switchpoints that are symmetrical between the two switches.
The A1233 is available in a plastic 8-pin SOIC surface mount package (L) and a plastic 4-pin SIP (K). Both are available in a temperature range of –40°C to 150°C. Each package is lead (Pb) free, with 100% matte tin plated leadframe.