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MAX9850ETI
Stereo Audio DAC with DirectDrive Headphone Amplifier
General DescriptionThe MAX9850 is a low-power, high-performance stereo
audio DAC with an integrated DirectDrive™ headphone
amplifier. The MAX9850 is designed to meet the board
space and performance requirements of portable devices
such as cell phones and MP3 and portable DVD players.
The MAX9850 uses Maxim’s patented DirectDrive
headphone technology that produces a ground-biased
analog audio output from a single supply, which allows
for driving the headphones directly from the amplifier
outputs without large DC-blocking capacitors. This fea-
ture saves board space, provides higher click/pop sup-
pression, and improves low-frequency (bass) response.
The architecture does not require the headphone jack
to be biased to a DC voltage and thus allows for a con-
ventional, grounded chassis design.
The MAX9850’s flexible clocking circuitry utilizes any
available system clock up to 40MHz, eliminating the
need for an external PLL and multiple crystal oscillators.
The DAC supports a wide range of sample rates from
8kHz to 48kHz in both master and slave modes, making
the MAX9850 the easiest to use and most versatile audio
DAC available. It can also be operated like traditional
synchronous DACs, at any integer-oversampling ratio.
The audio DAC receives input data over a flexible
3-wire interface that supports up to 32 bits of left-justi-
fied, right-justified, or I2S-compatible audio data. Stereo
audio line inputs are provided to either mix analog
audio with the digital input stream, or to drive the head-
phone outputs directly. Mode settings, headphone
amplifier volume controls, and shutdown for both the
headphone and line outputs are programmed through a
2-wire, I2C-compatible interface.
The MAX9850 is fully specified over the -40°C to +85°C
extended temperature range and is available in a low-
profile, 28-pin thin QFN package (5mm x 5mm x 0.8mm).
ApplicationsMP3/Portable Multimedia Players
Cell Phones/Smart Phones
Portable DVD Players
Features1.8V to 3.6V Single-Supply Operation30mW Stereo Headphone Output Power with
1.8V SupplyDirectDrive Outputs Eliminate DC-Blocking
Capacitors91dB PSRR at 1kHzAny Master Clock Up to 40MHzFlexible I2S-Compatible Digital Audio InterfaceI2C Headphone Volume and Mute ControlStereo Line Inputs and OutputsClickless/Popless Operation2-Wire (I2C)-Compatible Control InterfaceAvailable in 28-Pin Thin QFN Package
MAX9850
Stereo Audio DAC with DirectDrive
Headphone Amplifier
Ordering Information19-3454; Rev 0; 11/04
Purchase of I2C components from Maxim Integrated Products,
Inc. or one of its sublicensed Associated Companies, conveys
a license under the Philips I2C Patent Rights to use these com-
ponents in an I2C system, provided that the system conforms to
the I2C Standard Specification as defined by Philips.
Pin Configuration appears at end of data sheet.
Block Diagram*EP = Exposed Paddle. Package code T2855-6 (see Package
Information section).
MAX9850
Stereo Audio DAC with DirectDrive
Headphone Amplifier
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(DVDD= AVDD= PVDD= 3.0V, AGND = DGND = PGND = 0V, C1 = 0.47µF, C2 = 2.2µF, CNREG= CPREG= CREF= 1µF to AGND,
RLOAD_HP= 32Ωto AGND, RLOAD_OUT= 10kΩto AGND, fLRCLK= 48kHz, fMCLK= 12.288MHz, volume set to -9.5dB, TA= TMINto
TMAX, unless otherwise noted. Typical specifications at TA
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
(Voltages with respect to AGND.)
DVDD, AVDD, PVDD..................................................-0.3V to +4V
AVDDReferenced to PVDD....................................-0.3V to +0.3V
SVSS, PVSS...............................................................-4V to +0.3V
SVSSReferenced to PVSS.....................................-0.3V to +0.3V
DGND, PGND........................................................-0.3V to +0.3V
BCLK, LRCLK, HPS, SDIN.......................-0.3V to (DVDD+ 0.3V)
GPIO, MCLK.............................................................-0.3V to +4V
REF, PREG...............................................-0.3V to (AVDD+ 0.3V)
NREG........................................................+0.3V to (SVSS- 0.3V)
SDA, SCL, ADD........................................................-0.3V to +4V
INL, INR.......................................................................-2V to +2V
HPR, HPL.....................................(SVSS- 0.3V) to (AVDD+ 0.3V)
OUTL, OUTR.............................(NREG - 0.3V) to (PREG + 0.3V)
C1N............................................(PVSS- 0.3V) to (PGND + 0.3V)
C1P............................................(PGND - 0.3V) to (PVDD+ 0.3V)
Current Into/Out of Any Pin...............................................100mA
Duration of HPL, HPR, OUTL,
OUTR Short Circuit to AGND.................................Continuous
Continuous Power Dissipation (TA= +70°C)
28-Pin Thin QFN (derate 35.7mW/°C above +70°C).....2857mW
Junction Temperature......................................................+150°C
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX9850
Stereo Audio DAC with DirectDrive
Headphone Amplifier
ELECTRICAL CHARACTERISTICS (continued)(DVDD= AVDD= PVDD= 3.0V, AGND = DGND = PGND = 0V, C1 = 0.47µF, C2 = 2.2µF, CNREG= CPREG= CREF= 1µF to AGND,
RLOAD_HP= 32Ωto AGND, RLOAD_OUT= 10kΩto AGND, fLRCLK= 48kHz, fMCLK= 12.288MHz, volume set to -9.5dB, TA= TMINto
TMAX, unless otherwise noted. Typical specifications at TA
MAX9850
Stereo Audio DAC with DirectDrive
Headphone Amplifier
ELECTRICAL CHARACTERISTICS (continued)(DVDD= AVDD= PVDD= 3.0V, AGND = DGND = PGND = 0V, C1 = 0.47µF, C2 = 2.2µF, CNREG= CPREG= CREF= 1µF to AGND,
RLOAD_HP= 32Ωto AGND, RLOAD_OUT= 10kΩto AGND, fLRCLK= 48kHz, fMCLK= 12.288MHz, volume set to -9.5dB, TA= TMINto
TMAX, unless otherwise noted. Typical specifications at TA
MAX9850
Stereo Audio DAC with DirectDrive
Headphone Amplifier
ELECTRICAL CHARACTERISTICS (continued)(DVDD= AVDD= PVDD= 3.0V, AGND = DGND = PGND = 0V, C1 = 0.47µF, C2 = 2.2µF, CNREG= CPREG= CREF= 1µF to AGND,
RLOAD_HP= 32Ωto AGND, RLOAD_OUT= 10kΩto AGND, fLRCLK= 48kHz, fMCLK= 12.288MHz, volume set to -9.5dB, TA= TMINto
TMAX, unless otherwise noted. Typical specifications at TA
