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Low-Power Headset Detectors with SEND/END Button Support

Versatile Jack Detection and Control with High-Performance MIC Bias and Ultra-Low-Power Mode

Product Details

Key Features

Parametric specs for Audio Jack Detectors
VSUPPLY (V) 3.1 to 5.5
Low-Noise LDO Output (V) 2.8
MIC Switch Detection Open and Ground
Control Inputs MIC Mode
Supply Current for MIC Detection (µA) 1.9
Pop-Up Noise Elimination Plug-in and Plug-out
ESD Protection 15kV HBM on MIC and DETIN
Package/Pins TDFN-CU/8
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
0.85
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Simplified Block Diagram

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Parameters

Parametric specs for Audio Jack Detectors
VSUPPLY (V) 3.1 to 5.5
Low-Noise LDO Output (V) 2.8
MIC Switch Detection Open and Ground
Control Inputs MIC Mode
Supply Current for MIC Detection (µA) 1.9
Pop-Up Noise Elimination Plug-in and Plug-out
ESD Protection 15kV HBM on MIC and DETIN
Package/Pins TDFN-CU/8
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
0.85

Key Features

  • Versatile Jack Detection and Control
    • MODE Three-State Microphone Bias Control
    • MIC Switch Ground Detection (MAX14627)
    • MIC Switch Open and Ground Detection (MAX14628)
  • Compatible with Windows Mobile 7 and Google Android
    • Microphone Button Press Detection
  • High-Performance MIC Bias and Power Savings
    • No Pop-Up Noises
    • Ultra-Low Noise, High-PSRR MIC Bias
    • Low-Power MIC Idle Mode
    • Automatic Ultra-Low-Power Mode When Microphone Is Disabled
  • PCB Space and Cost Savings
    • Integrated ±15kV ESD Protection (HBM) on DETIN and MIC Input Terminals
    • Small 8-Pin (2mm x 2mm) TDFN Package

Applications/Uses

  • Cell Phones
  • Portable Media Players
  • Tablet/Laptop PCs

Description

The MAX14627/MAX14628 provide a simple solution for detecting the insertion and managing the operation of a 3.5mm stereo headset with a microphone. These devices integrate all circuitry needed to detect SEND/END button press events and generate required microphone bias voltages, and are fully compatible with Windows® Mobile 7.

The devices need only three GPIOs from the host controller to select between call mode and standby mode, and monitor the SEND/END and jack insertion status. In call mode, the low-noise LDO is enabled to provide DC bias to the externally preamplified microphone. In standby mode, microphone low-power pulsing is enabled to reduce supply current while waiting for a SEND/END button press event. Two open-drain outputs signal the host controller when an insertion/removal or SEND/END button press event occurs. If a 3P headset without a microphone is inserted, the low-power pulsing can be disabled by setting the MODE input to high impedance.

The MAX14627 operates from a 2.5V to 5.5V input voltage supply and features an internal 2.2V LDO output, while the MAX14628 operates from a 3.1V to 5.5V voltage supply and features an internal 2.8V LDO output voltage. Both devices control jack insertion detection by monitoring a 3.5mm socket with a normally open jack insertion switch. Additionally, the MAX14628 features open microphone detection.

The MAX14627/MAX14628 are available in an 8-pin TDFN package, and are fully specified over the -40°C to +85°C extended temperature range.

Simplified Block Diagram

MAX14627, MAX14628: Typical Operating Circuit MAX14627, MAX14628: Typical Operating Circuit Zoom icon

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 .