MAX22707AUB+

Overview

The MAX22707AUB+ is a low-power, precision zero-crossing detector manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single supply voltage ranging from 3.0V to 5.5V with a typical quiescent current of 1.0mA and a standby current of 2.0µA. The device provides ±1% accuracy for zero-crossing detection and features selectable fourth-order Low-Pass Filter (LPF) or Band-Pass Filter (BPF) configurations. It supports input frequencies of 50Hz, 60Hz, 100Hz, and 120Hz via the Mode Control pin. The ZCO output is an open-drain type with a maximum output low voltage of 0.4V at 4mA load. The component is housed in a 10-pin µMAX package and functions within an ambient temperature range of -40°C to +125°C.

Feature Summary

• Integrated precision analog filtering using switched-capacitor technology to eliminate flicker and reduce PCB footprint compared to discrete solutions.
• Configurable filter modes allowing selection between fourth-order Low-Pass Filter (LPF) and Band-Pass Filter (BPF) for optimized noise rejection.
• Supports multiple AC input signal types including bipolar sine waves, unipolar biased signals, and fully or half-wave rectified inputs.
• Includes a power-saving stand-by mode controlled by the EN pin to minimize energy consumption during inactive periods.

Applications

• Industrial lighting dimming systems requiring precise phase control
• AC phase detection circuits for power monitoring
• Flexible zero-crossing detection in solid-state relays

Procurement Notes

Verify the specific ordering suffix when sourcing components. The 'T' suffix indicates tape-and-reel packaging, while its absence denotes individual units. Confirm that the '+ ' designation corresponds to lead-free and RoHS-compliant manufacturing standards required for your assembly process. Ensure the selected variant matches the required operating temperature range specifications.

Selection Notes

Select the MAX22707AUB+ when high-precision zero-crossing detection is required without external precision filter capacitors. Choose the LPF configuration for applications involving rectified inputs or broader frequency bands, and the BPF configuration for strict 50Hz or 60Hz sinusoidal tracking. Evaluate the input network requirements based on whether the application utilizes single-ended or differential AC line inputs.

Part Context

This component belongs to the MAX22707 family of precision zero-crossing detectors designed for AC line applications. It replaces complex discrete networks comprising amplifiers, comparators, and passive filters. The device integrates the necessary filtering and detection logic into a compact 10-pin µMAX package, simplifying the bill of materials and reducing the overall circuit board area required for AC sensing tasks.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.