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EVALUATION KIT AVAILABLE
MAX98091
Ultra-Low Power Stereo Audio Codec
General Description
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.
Simplified Block Diagram
BATTERY 1.8V 1.2V
Features and Benefits
● 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 6mmx6mmx0.75mm TQFN Packages
I2S/ TDM
I2C
OR DIGITAL MICROPHONE
OR ANALOG MICROPHONE LINE INPUT
OR
ANALOG MICROPHONE
LINE INPUT
1 2
3 4
STEREO DIGITAL MICROPHONE 1
STEREO DIGITAL MICROPHONE 2
MICROPHONE 1 PREAMP/PGA (DIFFERENTIAL)
MICROPHONE 2 PREAMP/PGA (DIFFERENTIAL)
OR DIGITAL MICROPHONE
LINE INPUT A PGA 5 (DIFFERENTIAL OR 6 SINGLE-ENDED)
OR ANALOG MICROPHONE LINE INPUT
LINE INPUT B PGA (DIFF.