MAX9856 Datasheet, PDF (1/46 Pages) Maxim Integrated Products – Low-Power Audio CODEC with DirectDrive Headphone Amplifiers

19-1288; Rev 2; 12/11
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Low-Power Audio CODEC with
DirectDrive Headphone Amplifiers
General Description
The MAX9856 is a high-performance, low-power stereo
audio CODEC designed for MP3, personal media play-
ers (PMPs), or other portable multimedia devices.
Using on-board stereo DirectDrive^® headphone ampli-
fiers, the CODEC can output 30mW into stereo 32Ω
headphones while operating from a single 1.8V power
supply. Very low 9mW playback power consumption
makes it an ideal choice for battery-powered applica-
tions. The MAX9856 provides microphone input ampli-
fiers, plus flexible input selection, signal mixing, and
automatic gain control (AGC). Comprehensive load-
impedance sensing allows the MAX9856 to autodetect
most common audio and audio/video headset and jack
plug types.
Outputs include stereo DirectDrive line outputs and
DirectDrive headphone amplifiers. The stereo ADC can
convert audio signals from either internal or external
microphones that can be configured for single-ended
or differential signal inputs. Line inputs can be config-
ured as stereo, differential, or mono and fed through
one channel of the microphone path. The analog inputs
selected can be gain ranged or mixed with other input
sources prior to conversion to digital. The ADC path
also features programmable digital highpass filters to
remove DC offset voltages and wind noise.
The MAX9856 supports all common sample rates from
8kHz to 48kHz in both master and slave mode. The ser-
ial digital audio interfaces support a variety of formats
including I²S, left-justified, and PCM modes.
The MAX9856 uses a thermally efficient, space-saving
40-pin, 6mm x 6mm x 0.8mm TQFN package.
MP3 Players
Personal Media Players
Handheld Gaming Consoles
Cellular Phones
Applications
Pin Configuration appears at end of data sheet.
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
Features
o 1.71V to 3.6V Single-Supply Operation
o Stereo 30mW DirectDrive Headphone Amplifier
o Stereo 1V_RMS DirectDrive Line Outputs
(V_DD = 1.8V) and Stereo Line Inputs
o Low-Noise Stereo and Mono Differential
Microphone Inputs with Automatic Gain Control
and Noise Quieting
o 9mW Playback Power Consumption (V_DD = 1.8V)
o 91dB 96kHz 18-Bit Stereo DAC
o 85dB 48kHz 18-Bit Stereo ADC
o Supports Any Master Clock Frequency from
10MHz to 60MHz
o ADCs and DACs Can Run at Independent Sample
Rates
o Flexible Audio Mixing and Volume Control
o Clickless/Popless Operation
o Headset Detection Logic
o I²C Control Interface
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX9856ETL+
-40°C to +85°C
40 TQFN-EP*
MAX9856GTL/V+
-40°C to +105°C
40 TQFN-EP*
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
/V denotes an automotive qualified part.
Simplified Block Diagram
DVDD AND DVDDS2
1.71V TO 3.6V
AVDD AND CPVDD
1.71V TO 3.6V
MAX9856
DAC
AUXIN
LINEIN1
MUX
LINEIN2
DIGITAL
FILTERING DAC
AND
SDOUT
MIXERS
SDIN
ADC
BCLK ^DIGITAL
INTERFACE
LRCLK_D
ADC
LRCLK_A
SDA
SCL
I²C
IRQ
CLOCK
CONTROL
ANALOG
MIXERS
MCLK
LEFT LINE
OUT
RIGHT LINE
OUT
DIFF
MIC
LEFT
EXT
MIC
RIGHT
EXT
MIC
________________________________________________________________ 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.