MAX9875

Low RF Susceptibility Mono Audio Subsystem with DirectDrive Headphone Amplifier

Industry's Smallest Size and Best-in-Class RF Susceptibility (TDMA Noise Free) Audio Subsystem

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Overview

Low Emissions, Filterless Class D Amplifier Achieves Better than 10dB Margin Under EN55022 Class B Limits
Low RF Susceptibility Design Rejects TDMA Noise from GSM Radios
Input Mixer with User-Defined Input Mode
725mW Speaker Output (R_SPK = 8Ω, PVDD = 3.7V)
53mW Headphone Output (R_HP = 16Ω, V_DD = 3.7V)
Low 0.05% THD+N at 1kHz (Class D Power Amplifier)
Low 0.016% THD+N at 1kHz (Headphone Amplifier)
87% Efficiency (R_SPK = 8Ω, P_OUT = 750mW)
High Speaker Amplifier PSRR (72dB at 217Hz)
High Headphone Amplifier PSRR (84dB at 217Hz)
I²C Control
Hardware and Software Shutdown Mode
Click-and-Pop Suppression
Current-Limit and Thermal Protection
Available in a Space-Saving, 2.5mm x 2.0mm WLP Package

The MAX9875 combines a high-efficiency Class D audio power amplifier with a stereo Class AB capacitorless DirectDrive® headphone amplifier. Maxim's 3rd generation, filterless Class D amplifier with active emissions limiting technology provides Class AB performance with Class D efficiency.

The MAX9875 delivers up to 725mW from a 3.7V supply into an 8Ω load with 87% efficiency to extend battery life. The filterless modulation scheme combined with active emissions limiting circuitry and spread-spectrum modulation greatly reduces EMI while eliminating the need for output filtering used in traditional Class D devices.

The stereo Class AB headphone amplifier in the MAX9875 uses Maxim's DirectDrive architecture, that produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, space, and component height.

The device utilizes a user-defined input architecture, three preamplifier gain settings, an input mixer, volume control, comprehensive click-and-pop suppression, and I²C control.

The MAX9875 is available in a thermally efficient, space-saving 20-bump WLP package.

Applications

Cell Phones
Portable Multimedia Players

Documentation

Data Sheet 1

MAX9875: Low RF Susceptibility Mono Audio Subsystem with DirectDrive Headphone Amplifier Data Sheet (Rev.0) 04/01/2009

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Audio Amplifiers 1
MAX9877		Low RF Susceptibility Mono Audio Subsystem with DirectDrive Headphone Amplifier

Evaluation Kits

Evaluation Kit for the MAX9875

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Features and Benefits

2.7V to 5.25V Single-Supply Operation
Proven Audio PCB Layout
On-Board USB Interface Circuit Generates I²C-Compatible Signals
USB-PC Connection (Cable Included)
PCB Pads for User-Supplied I²C-Compatible Signals
PCB Pads for Audio Input and Output Signals
Evaluates the MAX9875ERP+ in a 2mm x 2.5mm, 20-Bump, (5 x 4) UCSP™ Package
Windows 2000/XP- and Windows Vista (32-Bit)-Compatible Software
Lead(Pb)-Free and RoHS Compliant
Fully Assembled and Tested

Product Details

The MAX9875 evaluation kit (EV kit) is an assembled and tested PCB that evaluates the MAX9875 IC. The MAX9875 is a Class D audio power amplifier and stereo DirectDrive® headphone amplifier communicating over a 2-wire I²C interface. The MAX9875 features user-defined input configuration, input gain, input source, output enable, volume control, and oscillator frequency-modulation modes. The user-defined features are programmed through the I²C-compatible serial interface, communicating at data rates up to 400kbps. The I²C data is sent through an on-board USB interface circuit using a computer or a user-supplied I²C bus.

The EV kit also features Windows® 2000/XP®- and Windows Vista®-compatible software that provides a user interface for exercising the MAX9875's features. The program is menu driven and offers a graphical user interface (GUI) complete with buttons, checkboxes, and track bars.