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Low-Power, Stereo Audio Codec

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

Product Details

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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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

Applications/Uses

  • Cell Phones
  • Portable Gaming Devices
  • Portable Multimedia Players
  • Portable Navigation Devices
  • Wireless Headsets
Parametric specs for Audio Codecs
Functions Audio CODEC
VSUPPLY (V) (min) 1.65
VSUPPLY (V) (max) 1.95
IQ (mA) 4.68 (Playback)
# ADCs 2
# DACs 2
SNR (dB) (ADC) 85
Bit Depth (ADC) 18
Sample Rate (kHz) (ADC) 8 to 48
SNR (dB) (DAC) 90
Bit Depth (DAC) 18
Sample Rate (kHz) (DAC) 8 to 48
Pitch (mm) 0.4
0.5
Interface Audio - I2S
Serial - I2C
Package/Pins TQFN/32
TQFN-CU/32
WLP/30
Budgetary
Price (See Notes)
$1.00 @1k
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Simplified Block Diagram

MAX9867: Simplified Block Diagram MAX9867: Simplified Block Diagram Zoom icon

Technical Docs

Design & Development

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Description

The MAX9867 evaluation kit (EV kit) consists of a MAX9867 evaluation board and software. The EV kit is a fully assembled and tested circuit board that evaluates the MAX9867 low-power, stereo audio codec. The EV kit is designed to send and receive digital audio data in the Sony/Philips digital interface (S/PDIF) format and can be optionally configured to communicate using generic digital audio or I2S-compatible signals.

The EV kit provides two RCA jacks for analog audio input signals and two 3.5mm headphone jacks for analog audio output signals. The EV kit also provides fiber optic receiving and transmitting modules for digital audio input and output.

The EV kit includes Windows® 2000-, Windows XP®-, and Windows Vista®-compatible software that provides a graphical user interface (GUI) for exercising the features of the MAX9867. The EV kit is connected to a PC through a USB A-to-mini-B cable.

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Features

  • USB-PC Connection (Cable Included)
  • USB Powered (External Power Supply Not Required)
  • On-Board 12.288MHz and 13MHz Clock Oscillators
  • On-Board Digital Audio Interface Transceiver
  • On-Board Fiber Optic Transmitter and Receiver Modules
  • Isolation Header for Direct Communication with the MAX9867 I2C and Digital Audio Interfaces
  • Proven PCB Layout
  • Windows 2000-, Windows XP-, and Windows Vista (32-Bit)-Compatible Software

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Support & Training

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Parameters

Parametric specs for Audio Codecs
Functions Audio CODEC
VSUPPLY (V) (min) 1.65
VSUPPLY (V) (max) 1.95
IQ (mA) 4.68 (Playback)
# ADCs 2
# DACs 2
SNR (dB) (ADC) 85
Bit Depth (ADC) 18
Sample Rate (kHz) (ADC) 8 to 48
SNR (dB) (DAC) 90
Bit Depth (DAC) 18
Sample Rate (kHz) (DAC) 8 to 48
Pitch (mm) 0.4
0.5
Interface Audio - I2S
Serial - I2C
Package/Pins TQFN/32
TQFN-CU/32
WLP/30
Budgetary
Price (See Notes)
$1.00 @1k

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

Applications/Uses

  • Cell Phones
  • Portable Gaming Devices
  • Portable Multimedia Players
  • Portable Navigation Devices
  • Wireless Headsets

Description

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.

Request S/W Drivers

Simplified Block Diagram

MAX9867: Simplified Block Diagram MAX9867: Simplified Block Diagram 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.