19-4349; Rev 1; 9/09
16-Bit Mono Audio Voice Codec
MAX9860
General Description
Features
The MAX9860 is a low-power, voiceband, mono audio
codec designed to provide a complete audio solution
for wireless voice headsets and other mono voice audio
devices. Using an on-chip bridge-tied load mono head-
phone amplifier, the MAX9860 can output 30mW into a
32Ω earpiece while operating from a single 1.8V power
supply. Very low power consumption makes it an ideal
choice for battery-powered applications.
o 1.8V Single-Supply Operation
o Digital Highpass Elliptical Filters with Notch for
217Hz (GSM)
o Mono 30mW BTL Headphone Amplifier
o Dual Low-Noise Microphone Inputs
o Automatic Microphone Gain Control and Noise
The MAX9860’s flexible clocking circuitry utilizes com-
mon system clock frequencies ranging from 10MHz to
60MHz, eliminating the need for an external PLL and
multiple crystal oscillators. Both the ADC and DAC sup-
port sample rates of 8kHz to 48kHz in either synchro-
nous or asynchronous operation. Both master and slave
timing modes are supported.
Gate
o 90dB DAC DR (f = 48kHz)
S
o 81dB ADC DR (f = 48kHz)
S
o Supports Master Clock Frequencies from 10MHz
to 60MHz
o Supports Sample Rates from 8kHz to 48kHz
o Flexible Digital Audio Interface
Two differential microphone inputs are available with a
user-programmable preamplifier and programmable
gain amplifier. Automatic gain control with selectable
attack/release times and signal threshold allows maxi-
mum dynamic range. A noise gate with selectable
threshold provides a means to quiet the channel when
no signal is present. Both the DAC and ADC digital filters
provide full attenuation for out-of-band signals as well as
a 5th order GSM-compliant digital highpass filter. A digi-
tal side tone mixer provides loopback of the micro-
phones/ADC signal to the DAC/headphone output.
o Clickless/Popless Operation
o 2-Wire, I2C-Compatible Control Interface
o Available in 24-Pin, Thin QFN, 4mm x 4mm x
0.8mm Package
Ordering Information
Serial DAC and ADC data is transferred over a flexible
digital I2S-compatible interface that also supports TDM
mode. Mode settings, volume control, and shutdown are
programmed through a 2-wire, I2C-compatible interface.
PART
TEMP RANGE
PIN-PACKAGE
MAX9860ETG+
-40°C to +85°C
24 TQFN-EP*
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
The MAX9860 is fully specified over the -40°C to +85°C
extended temperature range and is available in a low-
profile, 4mm x 4mm, 24-pin thin QFN package.
Simplified Block Diagram
DVDDIO
1.7V TO 3.6V
AVDD AND DVDD
1.7V TO 1.9V
Applications
Audio Headsets
Portable Navigation Device
Mobile Phones
2
MAX9860
I C
INTERFACE
Smart Phones
DAC
VoIP Phones
DIGITAL
FILTERING
AND
DIGITAL
AUDIO
INTERFACE
Audio Accessories
DIGITAL AUDIO
INPUT/OUTPUT
DIFF
MIC
ADC
ADC
MIXERS
DIFF
MIC
CLOCK
CONTROL
Pin Configuration and Typical Operating Circuit appear at
end of data sheet.
________________________________________________________________ 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.
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