A1688

A1688 Two-Wire, True Zero-Speed, High Accuracy Sensor IC FEATURES AND BENEFITS Integrated capacitor reduces need for external EMI protection components Wide leads facilitate ease of assembly True zero-speed operation Automatic Gain Control (AGC) for air gap independent switchpoints Automatic Offset Adjustment (AOA) for signal processing optimization Large operating air gap range Internal current regulator for two-wire operation Undervoltage lockout Single chip sensing IC for high reliability On-chip voltage regulator with wide operating voltage range and stability in the presence of a variety of complex load impedances Fully synchronous digital logic with Scan and IDDQ testing Package: 2-pin SIP (suffix UB) Not to scale DESCRIPTION The A1688 is a Hall-effect-based integrated circuit (IC) that provides a user-friendly solution for true zero-speed digital ring magnet and gear tooth sensing in two-wire applications. The A1688 is offered in the UB package, which integrates the IC and a high temperature ceramic capacitor in a single overmolded SIP package. The integrated capacitor provides enhanced EMC performance with reduced external components. The integrated circuit incorporates a dual-element Hall-effect circuit and signal processing that switches in response to differential magnetic signals created by magnetic encoders, or, when properly backbiased with a magnet, from ferromagnetic targets. The device contains a sophisticated digital circui...