Low-Power, Stereo Audio Codec

Ultra-Low-Power, Stereo Audio Codec Integrates Auxiliary Battery-Measurement ADC and Capacitorless Headphone Amps

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The MAX9867 is an ultra-low power stereo audio codec designed for portable consumer devices such as mobile phones and portable gaming consoles.

The device features stereo differential microphone inputs that can be connected to either analog or digital microphones. The single-ended line inputs, with configurable preamplifier, can be sent to the ADC for record or routed directly to the headphone amplifier for playback. An auxiliary ADC path can be used to track any DC voltage.

The stereo headphone amplifiers support differential, single-ended, and capacitorless output configurations. Using the capacitorless output configuration, the device can output 10mW into 32Ω headphones. Comprehensive click-and-pop circuitry suppresses audible clicks and pops during volume changes and startup or shutdown.

Utilizing Maxim's proprietary digital circuitry, the device can accept any available 10MHz to 60MHz system clock. This architecture eliminates the need for an external PLL and multiple crystal oscillators. The stereo ADC and DAC paths provide user-configurable voiceband or audioband digital filters. Voiceband filters provide extra attenuation at the GSM packet frequency and greater than 70dB stopband attenuation at fS/2.

The MAX9867 operates from a single 1.8V supply, and supports a 1.65V to 3.6V logic level. An I²C 2-wire serial interface provides control for volume levels, signal mixing, and general operating modes.

The MAX9867 is available in a tiny 2.2mm x 2.7mm, 0.4mm-ball-pitch, WLP package. A 32-pin 5mm x 5mm TQFN package is also available.

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MAX9867: Simplified Block Diagram MAX9867: Simplified Block Diagram Enlarge+

Key Features

  • 1.8V Single-Supply Operation
  • 6.7mW Playback Power Consumption
  • 90dB Stereo DAC, 8kHz ≤ fS ≤ 48kHz
  • 85dB Stereo ADC, 8kHz ≤ fS ≤ 48kHz
  • Battery-Measurement Auxiliary ADC
  • Support for Any Master Clock Between 10MHz to 60MHz
  • Stereo Digital Microphone Input Support
  • Stereo Analog Differential Microphone Inputs
  • Stereo Headphone Amplifiers: Differential, Single-Ended, or Capacitorless
  • Stereo Line Inputs
  • Voiceband Filter with a Stopband Attenuation Greater than 70dB
  • 1.65V to 3.6V Digital Interface Supply Voltage
  • I²S/TDM-Compatible Digital Audio Bus
  • 30-Bump, 2.2mm x 2.7mm 0.4mm-Pitch WLP


  • Cell Phones
  • Portable Gaming Devices
  • Portable Multimedia Players
  • Portable Navigation Devices
  • Wireless Headsets
Part NumberFunctionsVSUPPLY
Bit DepthSample Rate
Bit DepthSample Rate
MAX9867 Audio CODEC1.651.954.68 (Playback)2285188 to 4890188 to 48
Audio - I2S
Serial - I2C
$0.95 @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.

MAX9867EVKIT: Evaluation Kit for the MAX9867

CAD Symbols and Footprints

  • MAX9867ETJ+
  • MAX9867ETJ+G3U
  • MAX9867ETJ+T
  • MAX9867ETJ+TG3U
  • MAX9867EWV+
  • MAX9867EWV+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.

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