A1321, A1322, and A1323 Ratiometric Linear Hall Effect Sensor ICs for High-Temperature Operation Discontinued Product This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change: October 31, 2011 for the A1321EUA-T and the A1321LUA-T use the A1324LUA-T for the A1321ELHLT-T and the A1321LLHLT-T use the A1324LLHLX-T for the A1322LUA-T use the A1325LUA-T for the A1322LLHLT-T use the A1325LLHLX-T for the A1323EUA-T and the A1323LUA-T use the A1326LUA-T for the A1323LLHLT-T use the A1326LLHLX-T NOTE: For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no respon- sibility for its use nor for any infringements of patents or other rights of third parties which may result from its use.A1321, A1322, and A1323 Ratiometric Linear Hall Effect Sensor ICs for High-Temperature Operation Features and Benefits Description Temperature-stable quiescent output voltage The A132X family of linear Hall-effect sensor ICs are optimized, Precise recoverability after temperature cycling sensitive, and temperature-stable. These ratiometric Hall-effect Output voltage proportional to magnetic flux density sensor ICs provide a voltage output that is proportional to the Ratiometric rail-to-rail output applied magnetic field. The A132X family has a quiescent Improved sensitivity output voltage that is 50% of the supply voltage and output 4.5 to 5.5 V operation sensitivity options of 2.5 mV/G, 3.125 mV/G, and 5m V/G. Immunity to mechanical stress The features of this family of devices are ideal for use in the Solid-state reliability harsh environments found in automotive and industrial linear Robust EMC protection and rotary position sensing systems. Each device has a BiCMOS monolithic circuit which integrates a Hall element, improved temperature-compensating circuitry to reduce the intrinsic sensitivity drift of the Hall element, a small-signal high-gain amplifier, and a rail-to-rail low- Packages: 3 pin SOT23W (suffix LH), and impedance output stage. 3 pin SIP (suffix UA) A proprietary dynamic offset cancellation technique, with an internal high-frequency clock, reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. The high frequency clock allows for a greater sampling rate, which results in higher accuracy and faster signal processing capability. This technique produces devices that have an extremely stable quiescent output voltage, are immune to mechanical stress, and have precise Continued on the next page Not to scale Functional Block Diagram V+ VCC VOUT Out Amp Gain Offset 0.1 F Trim Control GND A1321-DS, Rev. 23 Dynamic Offset Cancellation Filter