EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX9850 Stereo Audio DAC with DirectDrive Headphone Amplifier General Description Features The MAX9850 is a low-power, high-performance stereo 1.8V to 3.6V Single-Supply Operation audio DAC with an integrated DirectDrive headphone 30mW Stereo Headphone Output Power with amplifier. The MAX9850 is designed to meet the board 1.8V Supply space and performance requirements of portable devices DirectDrive Outputs Eliminate DC-Blocking such as cell phones and MP3 and portable DVD players. Capacitors The MAX9850 uses Maxims DirectDrive headphone 91dB PSRR at 1kHz technology that produces a ground-biased analog audio output from a single supply, which allows for driving the Any Master Clock Up to 40MHz headphones directly from the amplifier outputs without large 2 Flexible I S-Compatible Digital Audio Interface DC-blocking capacitors. This feature saves board space, 2 I C Headphone Volume and Mute Control provides higher click/pop suppression, and improves Stereo Line Inputs and Outputs low-frequency (bass) response. The architecture does not require the headphone jack to be biased to a DC voltage Clickless/Popless Operation and thus allows for a conventional, grounded chassis 2 2-Wire (I C)-Compatible Control Interface design. Available in 28-Pin Thin QFN Package The MAX9850s flexible clocking circuitry utilizes any available system clock up to 40MHz, eliminating the need for an Ordering Information external PLL and multiple crystal oscillators. The DAC supports a wide range of sample rates from 8kHz to 48kHz PIN- PKG PART TEMP RANGE in both master and slave modes, making the MAX9850 the PACKAGE CODE easiest to use and most versatile audio DAC available. It MAX9850ETI+ -40C to +85C 28 TQFN-EP** T2855+ can also be operated like traditional synchronous DACs, at any integer-oversampling ratio. **EP = Exposed pad. +Denotes lead-free package. The audio DAC receives input data over a flexible 3-wire interface that supports left-justified, right- Pin Configuration appears at end of data sheet. 2 justified audio data, or I S-compatible audio data. Stereo audio line inputs are provided to either mix analog audio Block Diagram with the digital input stream, or to drive the headphone MCLK 1.8V TO 3.6V outputs directly. Mode settings, headphone amplifier volume controls, and shutdown for both the headphone and line outputs are programmed through a 2-wire, INR 2 I C-compatible interface. DIGITAL OUTR LINE The MAX9850 is fully specified over the -40C to +85C PLL MAX9850 OUT extended temperature range and is available in a low- HPR DAC profile, 28-pin thin QFN package (5mm x 5mm x 0.8mm). SDIN DIGITAL BCLK AUDIO LRCLK HPL Applications DAC MP3/Portable Multimedia Players SDA OUTL LINE Cell Phones/Smart Phones SCL 2 I C OUT ADD Portable DVD Players GPIO INL 19-3454 Rev 4 8/19MAX9850 Stereo Audio DAC with DirectDrive Headphone Amplifier Absolute Maximum Ratings (Voltages with respect to AGND.) OUTL, OUTR ..........................(NREG - 0.3V) to (PREG + 0.3V) DV , AV , PV ................................................-0.3V to +4V C1N ......................................... (PV - 0.3V) to (PGND + 0.3V) DD DD DD SS AV Referenced to PV ..................................-0.3V to +0.3V C1P ..........................................(PGND - 0.3V) to (PV + 0.3V) DD DD DD SV , PV ............................................................-4V to +0.3V Current Into/Out of Any Pin ..............................................100mA SS SS SV Referenced to PV ...................................-0.3V to +0.3V Duration of HPL, HPR, OUTL, SS SS DGND, PGND ......................................................-0.3V to +0.3V OUTR Short Circuit to AGND ................................Continuous BCLK, LRCLK, HPS, SDIN ....................-0.3V to (DV + 0.3V) Continuous Power Dissipation (T = +70C) DD A GPIO, MCLK ...........................................................-0.3V to +4V 28-Pin Thin QFN (derate 35.7mW/C above +70C) ...2857mW REF, PREG ............................................-0.3V to (AV + 0.3V) Junction Temperature ......................................................+150C DD NREG .....................................................+0.3V to (SV - 0.3V) Operating Temperature Range ........................... -40C to +85C SS SDA, SCL, ADD.......................................................-0.3V to +4V Storage Temperature Range ............................ -65C to +150C INL, INR ......................................................................-2V to +2V Lead Temperature (soldering, 10s) .................................+300C HPR, HPL ................................. (SV - 0.3V) to (AV + 0.3V) SS DD 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. Electrical Characteristics (DV = AV = PV = 3.0V, AGND = DGND = PGND = 0V, C1 = 0.47F, C2 = 2.2F, C = C = C = 1F to AGND, DD DD DD NREG PREG REF R = 32 to AGND, R = 10k to AGND, f = 48kHz, f = 12.288MHz, volume set to -9.5dB, T = T to LOAD HP LOAD OUT LRCLK MCLK A MIN T , unless otherwise noted. Typical specifications at T = +25C, unless otherwise noted.) (Note 1) MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS AV , DD Analog Supply Voltage AV = PV 1.8 3.6 V DD DD PV DD Digital Supply Voltage DV 1.8 3.6 V DD AV = 1.8V 5.5 7.7 Full operation (Note 2), no DD headphone or line output load AV = 3.0V 5.9 DD Analog Supply Current AI mA DD AV = 1.8V 3.5 5.3 Full operation (Note 2), DD headphones disabled AV = 3.0V 3.75 DD DV = 1.8V 2.1 2.9 Full operation (Note 2), DD Digital Supply Current DI mA DD no line output load DV = 3.0V 3.8 DD Analog Shutdown Current AI I + I , A = P = 1.8V 1.5 10 A SHDN AVDD PVDD VDD VDD Digital Shutdown Current DI Static digital interface, D = 1.8V 0.3 5 A SHDN VDD Shutdown to Full Operation t 1.3 ms ON (Note 2) Power-On to Full Operation t 1.4 ms PON (Note 2) DAC PERFORMANCE/LINE OUTPUTS (Note 3) 0dBFS Output Voltage V 1.85 1.95 2.05 V OUT FS P-P AV = 3.0V 87.5 DD Dynamic Range (Note 4) DR dB AV = 1.8V 82 87.5 DD Unweighted 88 A-weighted 91 Signal-to-Noise Ratio SNR dB (Note 5) AV = 1.8V, unweighted 88 DD AV = 1.8V, A-weighted 91 DD Maxim Integrated 2 www.maximintegrated.com