MAX9867_1006 Datasheet, PDF (1/55 Pages) Maxim Integrated Products – Ultra-Low Power Stereo Audio Codec

19-4573; Rev 2; 6/10
Ultra-Low Power Stereo Audio Codec
General 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 micro-
phones. 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 aux-
iliary 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 voice-
band or audioband digital filters. Voiceband filters pro-
vide extra attenuation at the GSM packet frequency
and greater than 70dB stopband attenuation at f_S/2.
The MAX9867 operates from a single 1.8V supply, and
supports a 1.65V to 3.6V logic level. An I²C 2-wire seri-
al 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.
Features
o 1.8V Single-Supply Operation
o 6.7mW Playback Power Consumption
o 90dB Stereo DAC, 8kHz ≤ f_S ≤ 48kHz
o 85dB Stereo ADC, 8kHz ≤ f_S ≤ 48kHz
o Battery-Measurement Auxiliary ADC
o Support for Any Master Clock Between 10MHz to
60MHz
o Stereo Digital Microphone Input Support
o Stereo Analog Differential Microphone Inputs
o Stereo Headphone Amplifiers: Differential,
Single-Ended, or Capacitorless
o Stereo Line Inputs
o Voiceband Filter with a Stopband Attenuation
Greater than 70dB
o 1.65V to 3.6V Digital Interface Supply Voltage
o I²S/TDM-Compatible Digital Audio Bus
o 30-Bump, 2.2mm x 2.7mm 0.4mm-Pitch WLP
Applications
Cell Phones
Portable Gaming Devices
Portable Navigation Devices
Portable Multimedia Players
Wireless Headsets
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX9867EWV+
-40°C to +85°C 30 WLP
MAX9867ETJ+
-40°C to +85°C 32 TQFN-EP*
+Denotes lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Simplified Block Diagram
I²S/PCM
I²C
LINEIN 1
LINEIN 2
LEFT MIC AMP
DIGITAL MICROPHONE
INTERFACE
RIGHT MIC AMP
LEFT PREAMP
RIGHT PREAMP
DIGITAL AUDIO INTERFACE
CONTROL
INTERFACE
MIX
ADC
ADC
AUDIO DIGITAL
FILTERS
MAX9867
DAC
HEADPHONE
AMP
DAC
MIX
HEADPHONE
AMP
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.