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 has a low-power design and is suitable for a variety of applications including MP3 players, portable music players, digital audio players, and portable computers.
The MAX9856 is a high‑performance, low‑power stereo audio CODEC designed for portable multimedia devices such as MP3 players, handheld gaming consoles, and cellular phones. It integrates DirectDrive® headphone amplifiers that can deliver up to 30 mW into 32 Ω headphones while consuming only 9 mW of playback power from a single 1.8 V supply.
The device supports sample rates from 8 kHz to 48 kHz in both master and slave modes, provides stereo ADC and DAC paths with programmable digital filters, and includes automatic gain control, headset detection, and flexible input selection. It is offered in a 40‑pin TQFN package (6 mm × 6 mm × 0.8 mm).
| Stereo Headphone Output Power | 30 mW into 32 Ω headphones |
|---|---|
| Playback Power Consumption | 9 mW |
| Supported Sample Rates | 8 kHz to 48 kHz |
The MAX9856 can deliver up to 30 mW into stereo 32 Ω headphones.
The device supports sample rates from 8 kHz up to 48 kHz in both master and slave modes.