Ultra-Low Power Stereo Audio Codec

The MAX98091 is a fully integrated audio codec whose high-performance, ultra-low power consumption and small footprint make it ideal for portable applications.

The device features a highly flexible input scheme with six input pins that can be configured as analog or digital microphone inputs, differential or single-ended line inputs, or as full-scale direct differential inputs. Analog inputs can be routed to the record path ADC or directly to any analog output mixer.

The device accepts master clock frequencies of either 256 x fS or from 10MHz to 60MHz. The digital audio interface supports master or slave mode operation, sample rates from 8kHz to 96kHz, and standard PCM formats such as I²S, left/right-justified, and TDM.

The record/playback paths feature FlexSound® technology DSP. This includes digital gain and filtering, a biquad filter (record), dynamic range control (playback), and a seven band parametric equalizer (playback) that can improve loudspeaker performance by optimizing the frequency response.

The stereo Class D speaker amplifier provides efficient amplification, features low radiated emissions, supports filterless operation, and can drive both 4Ω and 8Ω loads. The DirectDrive® stereo Class H headphone amplifier provides a ground-referenced output eliminating the need for large DC-blocking capacitors. The device also includes a differential receiver (earpiece) amplifier that can be reconfigured as a stereo single-ended line output.

Applications

* Smartphones * Tablets

* 102dB DR Stereo DAC to HP

* 4.1mW Stereo Playback Power Consumption

* 99dB DR Stereo ADC

* 4.5mW Stereo Record Power Consumption

* 3 Stereo Single-Ended/Differential Analog Microphone/Line Inputs

* Two PDM Digital Microphone Inputs

* Master Clock Frequencies from 256 x fS to 60MHz

* I2S/LJ/RJ/TDM Digital Audio Interface

* FlexSound Technology Signal Processing

* Record Path Biquad Filter

* Playback Path 7-Band Parametric EQ

* Playback Path Automatic Level Control

* Digital Filtering and Gain/Level Control

* Stereo Low EMI Class D Speaker Amplifiers

* 3.2W/Channel (RL = 4Ω, VSPKVDD = 5V)

* 1.8W/Channel (RL = 8Ω, VSPKVDD = 5V)

* Stereo DirectDrive Class H Headphone Amplifier Jack Detection and Identification

* Differential Receiver Amplifier/Stereo Line Output

* Extensive Click-and-Pop Reduction Circuitry

* RF Immune Analog Inputs and Outputs

* Programmable Microphone Bias

* I2C Control Interface

* 56-Bump 0.4mm WLP and 48-Pin 6mm x 6mm x 0.75mm TQFN Packages