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MAX9850ETI Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX9850ETI Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 / 36 page  General Description The 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). Applications MP3/Portable Multimedia Players Cell Phones/Smart Phones Portable DVD Players Features ♦ 1.8V to 3.6V Single-Supply Operation ♦ 30mW Stereo Headphone Output Power with 1.8V Supply ♦ DirectDrive Outputs Eliminate DC-Blocking Capacitors ♦ 91dB PSRR at 1kHz ♦ Any Master Clock Up to 40MHz ♦ Flexible I2S-Compatible Digital Audio Interface ♦ I2C Headphone Volume and Mute Control ♦ Stereo Line Inputs and Outputs ♦ Clickless/Popless Operation ♦ 2-Wire (I2C)-Compatible Control Interface ♦ Available in 28-Pin Thin QFN Package Stereo Audio DAC with DirectDrive Headphone Amplifier ________________________________________________________________ Maxim Integrated Products 1 Ordering Information 19-3454; Rev 0; 11/04 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 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. PART TEMP RANGE PIN-PACKAGE MAX9850ETI -40°C to +85°C 28 Thin QFN-EP* Pin Configuration appears at end of data sheet. + DAC + DAC DIGITAL AUDIO DIGITAL PLL I2C MAX9850 SDIN BCLK LRCLK SDA SCL ADD GPIO LINE OUT LINE OUT OUTR HPR HPL OUTL INL INR 1.8V TO 3.6V MCLK Block Diagram *EP = Exposed Paddle. Package code T2855-6 (see Package Information section). |
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