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 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 feature saves board space, provides higher click/pop suppression, 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 conventional, 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 left-justified, right-justified audio data, 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 headphones.
The MAX9850 is a low‑power, high‑performance stereo audio DAC that includes Maxim’s DirectDrive headphone amplifier. It is designed for portable devices such as cell phones, MP3 players, and portable DVD players, offering ground‑biased analog output from a single supply and eliminating the need for large DC‑blocking capacitors.
Key features include 1.8 V to 3.6 V single‑supply operation, up to 30 mW stereo headphone output power, support for any master clock up to 40 MHz, and sample‑rate support from 8 kHz to 48 kHz. The device is supplied in a 28‑pin thin QFN package and operates over an extended temperature range of –40 °C to +85 °C.
| Supply Voltage | 1.8 V to 3.6 V |
|---|---|
| Headphone Output Power | 30 mW (stereo) at 1.8 V |
| Sample Rate Range | 8 kHz to 48 kHz |
| THD+N | 1 % (typical) |
The device operates from a single supply of 1.8 V to 3.6 V.
It can deliver up to 30 mW of stereo headphone output power when powered at 1.8 V.