MAX97236

Audio Amplifier with Jack Detection

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Overview

30mW Headphone Amplifier Employs Second- Generation DirectDrive^® with Dual-Mode Charge-Pump Architecture
Automatic Jack Detection Circuitry
Microphone Amplifier and Bias
1.8V Power Supply
2.4V to 3.6V Microphone Power Supply
Headphone Amplifier Volume Control
Decodes Data from a Passive Multibutton Headset Remote Control
25-Bump, 2.4mm x 2.3mm, 0.4mm Pitch WLP

The MAX97236 is an audio amplifier with volume control and microphone preamplifier intended for use in portable audio systems employing a headphone jack. The audio circuit is powered from a single, dual-mode charge pump, allowing the output signals to be ground referenced, and eliminating the need for large and expensive DC-blocking capacitors. The configuration of a 3.5mm jack is determined by autoconfigure circuitry. The IC’s functional blocks are auto-enabled after the configuration of the jack is determined.

The audio amplifier is powered from a single 1.8V power supply that reduces overall power consumption. The microphone preamplifier and bias are powered from a separate power-supply input accommodating bias voltages that are greater than 2.4V.

The automatic jack detection determines when a 3.5mm plug is inserted into the system jack and determines the configuration of the installed load. The configuration of the load is then reported to the system through the I2C interface. Multiple popular jack and load configurations are detectable with this scheme. The IC detects headsets, headphones, and A/V cables.

The headphone amplifier is capable of over 35mW into 16Ω. The device is available in a small, 25-bump WLP package with a 0.4mm pitch and is specified over the extended -40°C to +85°C temperature range.

Applications

Mobile Handsets
Notebooks
Portable Gaming Devices
Smartphones
Tablets

Documentation

Data Sheet 1

MAX97236: Audio Amplifier with Jack Detection Data Sheet (Rev.3) 06/22/2011

Reliability Data 1

MAX97236 Reliability Data 01/12/2023

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX97236

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Features and Benefits

USB Powered
I²C Interface
RCA Input Connectors
3.5mm Output Connector
Windows XP^®-, Windows Vista^®-, and Windows 7-Compatible Software
Surface-Mount Components
Proven PCB Layout
Fully Assembled and Tested

Product Details

The MAX97236 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB that evaluates the MAX97236 IC, which is an audio amplifier with automatic jack detection and configuration, volume control, and microphone preamplifier. To facilitate evaluation, the EV kit includes input RCA jack connectors (J2, J3), a 5-pin stereo headphone jack connector (J1), and an external clock input BNC jack connector (J4).

The device’s I²C control bus is interfaced to the on-board MAXQ2000 microcontroller, allowing for evaluation with the EV kit software.