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Low Power, Precision Zero Crossing Detector

Low Power, Integrated Zero Crossing Detector with ±1% Accuracy

Product Details

Parametric specs for Active Filters
Package/Pins UMAX-CU/10
Budgetary
Price (See Notes)
2.42
Parametric specs for Zero Crossing Detectors
Filter Type Bandpass
Lowpass
Order Per Filter Section 4
Current Limit (A) (max) 50
60
100
120
Filter Class Switched Cap
VSUPPLY (Single) (V) (min) 3
VSUPPLY (Single) (V) (max) 5.5
Oper. Temp. (°C) -40 to 125
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Simplified Block Diagram

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Parameters

Parametric specs for Active Filters
Package/Pins UMAX-CU/10
Budgetary
Price (See Notes)
2.42
Parametric specs for Zero Crossing Detectors
Filter Type Bandpass
Lowpass
Order Per Filter Section 4
Current Limit (A) (max) 50
60
100
120
Filter Class Switched Cap
VSUPPLY (Single) (V) (min) 3
VSUPPLY (Single) (V) (max) 5.5
Oper. Temp. (°C) -40 to 125

Key Features

  • Precision Zero Crossing Detection
    • Integrated Zero Crossing Detection with ±1% Accuracy
    • High Frequency Noise Filter
    • 4th Order Low-Pass Filter (LPF)
    • 4th Order Band-Pass Filter (BPF)
  • Configurability for Ease of Use
    • User Selectable Filter Configuration (LPF or BPF)
    • Selectable Input Frequency
    • Power Saving Stand-By Mode
    • Programmable DC Averaging Timer
  • Saves PCB Space and Bill of Materials (BOM) Cost
    • No External Precision Filter Capacitor Required
    • 10-Pin µMAX package 3mm x 3mm

Applications/Uses

  • AC Phase Detection
  • Flexible Zero Crossing Detection
  • Industrial Lighting Dimming

Description

The MAX22707 precision zero crossing detector provides a reliable and repeatable zero crossing detection signal based on an AC line input. The use of switched-capacitor filters helps to ensure minimal zero-crossing delay while tracking change in the input frequency and provides higher precision and a more inherently stable output than discrete solutions.

The MAX22707 features a low-power, precision analog filter based on the switched-capacitor technology designed for precision filtering of AC input noise. The device requires only a simple external input network preceding the AC inputs and no additional external components for the filters. The two different filter types can be selected by the Filter Selection pin (FS). The available filter types are the fourth order BPF and LPF. The DC averaging filter capacitor function is used for the latter.

The MAX22707 supports two standard line frequencies (50Hz and 60Hz) for both the filter types as well as rectified inputs in the case of LPF. If the BPF is selected, then the frequency selection Mode Control pin (MC) is used to select between 50Hz and 60Hz. If the LPF is selected, then the same pin is used to choose between 50/60Hz or 100/120Hz signal band (see Table 1). The Rectified Select pin (RS) is used to select between sine and rectified units (see Table 2). The MAX22707 is available in a compact 10-pin μMAX package and operates over the -40°C to +125°C temperature range.

Simplified Block Diagram

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.