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.
Features and Benefits
● 102dB DR Stereo DAC to HP
● 4.1mW Stereo Playback Power Consumption
● 99dB DR Stereo ADC
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.
● 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 f to 60MHz
S
2
● I S/LJ/RJ/TDM Digital Audio Interface
The device accepts master clock frequencies of either
256 x f or from 10MHz to 60MHz. The digital audio inter-
● FlexSound Technology Signal Processing
• Record Path Biquad Filter
S
face supports master or slave mode operation, sample
rates from 8kHz to 96kHz, and standard PCM formats
• Playback Path 7-Band Parametric EQ
• Playback Path Automatic Level Control
• Digital Filtering and Gain/Level Control
2
such as I S, 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 loud-
speaker performance by optimizing the frequency response.
● Stereo Low EMI Class D Speaker Amplifiers
• 3.2W/Channel (R = 4Ω, V
= 5V)
= 5V)
L
SPKVDD
SPKVDD
• 1.8W/Channel (R = 8Ω, V
L
● Stereo DirectDrive Class H Headphone Amplifier
Jack Detection and Identification
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 ampli-
fier 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.
● Differential Receiver Amplifier/Stereo Line Output
● Extensive Click-and-Pop Reduction Circuitry
● RF Immune Analog Inputs and Outputs
● Programmable Microphone Bias
2
● I C Control Interface
● 56-Bump 0.4mm WLP and 48-Pin
6mmx6mmx0.75mm TQFN Packages
Simplified Block Diagram
2
2
I C
BATTERY 1.8V 1.2V
I S/TDM
STEREO LINE OUTPUT
CLASS AB AMPLIFIER
(SINGLE ENDED)
STEREO DIGITAL
OR
DIGITAL
MICROPHONE 1
1
2
POWER
DIGITAL AUDIO
INTERFACE
CONTROL
MICROPHONE
LINE OUTPUT
OR
MANAGEMENT
REGISTERS
STEREO DIGITAL
MICROPHONE 2
OR
OR
SPEAKER LEFT
CLASS D AMPLIFIER
(DIFFERENTIAL)
ANALOG
MICROPHONE
LINE INPUT
RECEIVER/
EARPIECE
MICROPHONE 1
PREAMP/PGA
FLEXSOUND DSP
DIGITAL BIQUAD FILTER
(RECORD)
7-BAND PARAMETRIC
EQUALIZER (PLAYBACK)
DYNAMIC RANGE CONTROL
(PLAYBACK)
DIGITAL FILTERING
DIGITAL GAIN/LEVEL
CONTROL
•
•
(DIFFERENTIAL)
3
4
SPEAKER LEFT
CLASS D AMPLIFIER
(DIFFERENTIAL)
OR
ANALOG
MICROPHONE
MICROPHONE 2
PREAMP/PGA
(DIFFERENTIAL)
LINE INPUT
OR
STEREO
ADC
STEREO
DAC
SPEAKER
LEFT/RIGHT
•
SPEAKER RIGHT
CLASS D AMPLIFIER
(DIFFERENTIAL)
•
•
LINE INPUT A PGA
(DIFFERENTIAL OR
SINGLE-ENDED)
DIGITAL
MICROPHONE
5
6
OR
STEREO HEADPHONE
CLASS H AMPLIFIER
(SINGLE-ENDED)
LINE INPUT B PGA
(DIFFERENTIAL OR
SINGLE-ENDED)
ANALOG
MICROPHONE
LINE INPUT
HEADPHONES
OR
HEADSET
OR
3-POLE (TRS) 4-POLE (TRRS)
MAX98091
JACK DETECTION
CHARGE PUMP
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/MAX98091.related.
Ordering Information appears at end of data sheet.
19-6700; Rev 2; 11/14
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