The MAX9856 is a high-performance, low-power stereo audio CODEC designed for MP3, personal media players (PMPs), or other portable multimedia devices. Using on-board stereo DirectDrive® headphone amplifiers, 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 applications. The MAX9856 provides microphone input amplifiers, 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 configured 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 serial digital audio interfaces support a variety of formats including I2S, left-justified, and PCM modes. The MAX9856 is a leading low-power, high-performance stereo audio CODEC that is ideal for MP3 players, portable audio products, and other portable devices.
The MAX9856 is a high‑performance, low‑power stereo audio CODEC designed for portable multimedia devices such as MP3 players and handheld gaming consoles. It integrates DirectDrive headphone amplifiers that can deliver up to 30 mW into 32 Ω headphones while operating from a single 1.8 V supply.
The device offers flexible input selection, microphone pre‑amplifiers with automatic gain control, and a full set of digital audio interfaces (I²S, left‑justified, PCM). Electrical specifications include a 1.71 V‑3.6 V supply range, 40‑pin TQFN package, and support for sample rates from 8 kHz to 48 kHz. Detailed performance data cover DAC dynamic range, ADC signal‑to‑noise ratio, and power‑supply rejection ratios.
| Supply Voltage Range | 1.71 V to 3.6 V |
|---|---|
| Headphone Output Power | 30 mW into 32 Ω |
| Supported Sample Rates | 8 kHz to 48 kHz |
The MAX9856 operates from a single supply between 1.71 V and 3.6 V.
It can deliver up to 30 mW into 32 Ω stereo headphones.
The device supports audio sample rates from 8 kHz up to 48 kHz in both master and slave modes.