Ultra-Low Power Stereo Audio Codec

High-Performance Audio Codec with Ultra-Low Power Consumption and Small Footprint for Portable Applications

Please check latest availability status for a specific part variant.


The MAX98091 is a fully integrated audio codec whose high-performance, ultra-low power consumption and small footprint make it ideal for portable applications.

The device features a highly flexible input scheme with six input pins that can be configured as analog or digital microphone inputs, differential or single-ended line inputs, or as full-scale direct differential inputs. Analog inputs can be routed to the record path ADC or directly to any analog output mixer.

The device accepts master clock frequencies of either 256 x fS or from 10MHz to 60MHz. The digital audio interface supports master or slave mode operation, sample rates from 8kHz to 96kHz, and standard PCM formats such as I²S, left/right-justified, and TDM.

The record/playback paths feature FlexSound® technology DSP. This includes digital gain and filtering, a biquad filter (record), dynamic range control (playback), and a seven band parametric equalizer (playback) that can improve loudspeaker performance by optimizing the frequency response.

The stereo Class D speaker amplifier provides efficient amplification, features low radiated emissions, supports filterless operation, and can drive both 4Ω and 8Ω loads. The DirectDrive® stereo Class H headphone amplifier provides a ground-referenced output eliminating the need for large DC-blocking capacitors. The device also includes a differential receiver (earpiece) amplifier that can be reconfigured as a stereo single-ended line output.
MAX98091: Simplified Block Diagram MAX98091: Simplified Block Diagram Enlarge+

Key Features

  • 102dB DR Stereo DAC to HP
  • 4.1mW Stereo Playback Power Consumption
  • 99dB DR Stereo ADC
  • 4.5mW Stereo Record Power Consumption
  • 3 Stereo Single-Ended/Differential Analog Microphone/Line Inputs
  • Two PDM Digital Microphone Inputs
  • Master Clock Frequencies from 256 x fS to 60MHz
  • I2S/LJ/RJ/TDM Digital Audio Interface
  • FlexSound Technology Signal Processing
    • Record Path Biquad Filter
    • Playback Path 7-Band Parametric EQ
    • Playback Path Automatic Level Control
    • Digital Filtering and Gain/Level Control
  • Stereo Low EMI Class D Speaker Amplifiers
    • 3.2W/Channel (RL = 4Ω, VSPKVDD = 5V)
    • 1.8W/Channel (RL = 8Ω, VSPKVDD = 5V)
  • Stereo DirectDrive Class H Headphone Amplifier Jack Detection and Identification
  • Differential Receiver Amplifier/Stereo Line Output
  • Extensive Click-and-Pop Reduction Circuitry
  • RF Immune Analog Inputs and Outputs
  • Programmable Microphone Bias
  • I2C Control Interface
  • 56-Bump 0.4mm WLP and 48-Pin 6mm x 6mm x 0.75mm TQFN Packages


  • Smartphones
  • Tablets
Part NumberFunctionsVSUPPLY
Bit DepthSample Rate
Bit DepthSample Rate
MAX98091 Audio CODEC
1.08 (Digital)
1.65 (Digital)
1.65 (Analog)
2.8 (Class D)
1.98 (Digital)
2.0 (Analog)
3.6 (Digital)
5.5 (Class D)
2.33 (DAC Playback Headphone)
3.64 (Full Duplex Mono Receiver Out)
4.14 (DAC Playback Stereo Speaker)
2299248 to 96102248 to 960.4
Audio - I2S
Audio - PCM/TDM
Serial - I2C
Serial - SPI
$2.40 @1k
See All Audio Data Converters (6)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX98091EVKIT: Evaluation Kit for the MAX98091
MAX98091EVKIT#TQFN: Evaluation Kit for the MAX98091 (TQFN)

Technical Documents

Tutorial 5590 How to Select the Best Audio Amplifier for Your Design

Quality and Environmental Data

Product Reliability Reports: MAX98091.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX98091ETM+T
  • MAX98091EWN+
  • MAX98091EWN+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >


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