Rainbow Electronics MAX9860 - Manual

General Description
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
32
Ω earpiece while operating from a single 1.8V power
supply. Very low power consumption makes it an ideal
choice for battery-powered applications.
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.
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.
Serial DAC and ADC data is transferred over a flexible
digital I
2 S-compatible interface that also supports TDM
mode. Mode settings, volume control, and shutdown are
programmed through a 2-wire, I
2 C-compatible interface.
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.
Applications
Audio Headsets
Portable Navigation Device
Mobile Phones
Smart Phones
VoIP Phones
Audio Accessories
Features
♦ 1.8V Single-Supply Operation
♦ Digital Highpass Elliptical Filters with Notch for
217Hz (GSM)
♦ Mono 30mW BTL Headphone Amplifier
♦ Dual Low-Noise Microphone Inputs
♦ Automatic Microphone Gain Control and Noise
Gate
♦ 90dB DAC DR (f
S = 48kHz)
♦ 81dB ADC DR (f
S = 48kHz)
♦ Supports Master Clock Frequencies from 10MHz
to 60MHz
♦ Supports Sample Rates from 8kHz to 48kHz
♦ Flexible Digital Audio Interface
♦ Clickless/Popless Operation
♦ 2-Wire, I
2 C-Compatible Control Interface
♦ Available in 24-Pin, Thin QFN, 4mm x 4mm x
0.8mm Package
MAX9860
16-Bit Mono Audio Voice Codec
________________________________________________________________ Maxim Integrated Products 1
19-4349; Rev 0; 10/08
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.
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX9860ETG+ -40°C to +85°C 24 TQFN-EP*
+ Denotes a lead-free/RoHS-compliant package.
* EP = Exposed pad.
ADC
ADC
DIGITAL
AUDIO
INTERFACE
DIGITAL
FILTERING
AND
MIXERS
DIFF
MIC
DIFF
MIC
DAC
AVDD AND DVDD
1.7V TO 1.9V
DVDDIO
1.7V TO 3.6V
CLOCK
CONTROL
DIGITAL AUDIO
INPUT/OUTPUT
I 2 C
INTERFACE
MAX9860
Simplified Block Diagram
Pin Configuration and Typical Operating Circuit appear at
end of data sheet.