MAX9879 Datasheet, PDF (1/31 Pages) Maxim Integrated Products – Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier

19-4436; Rev 0; 2/09
EVAALVUAAILTAIOBNLEKIT
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
General Description
The MAX9879 combines a high-efficiency stereo Class D
audio power amplifier with a stereo capacitor-less
DirectDrive^® headphone amplifier. Maxim’s filterless class
D amplifiers with active emissions limiting technology pro-
vide Class AB performance with Class D efficiency.
The Class D power amplifier delivers up to 715mW from
a 3.7V supply into an 8Ω load with 88% efficiency to
extend battery life. The filterless modulation scheme
combined with active emission limiting circuitry and
spread-spectrum modulation greatly reduces EMI while
eliminating the need for output filtering used in tradition-
al Class D devices.
The headphone amplifier delivers up to 58mW from a
3.7V supply into a 16Ω load. Maxim’s patented
DirectDrive architecture produces a ground-referenced
output from a single supply, eliminating the need for
large DC-blocking capacitors, saving cost, space and
component height.
The device utilizes a user-defined input architecture,
three preamplifier gain settings, an input mixer, volume
control, comprehensive click-and-pop suppression, and
I²C control. A bypass mode feature disables the integrat-
ed Class D amplifier and utilizes an internal DPST switch
to allow an external amplifier to drive the speaker that is
connected at the outputs of the MAX9879.
The MAX9879 is available in a thermally efficient,
space-saving 30-bump UCSP™ package.
Applications
Cell Phones
Portable Multimedia Players
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
UCSP is a trademark of Maxim Integrated Products, Inc.
Simplified Block Diagram
SINGLE SUPPLY
2.7V TO 5.5V
PREAMPLIFIER
VOLUME
CONTROL
MIXER
I²C
INTERFACE
VOLUME
CONTROL
MAX9879
BYPASS
Features
♦ Better than 9dB Margin Under EN 55022 Class B
Limits with No Filter Components
♦ Low RF Susceptibility Design Rejects TDMA
Noise from GSM Radios
♦ Input Mixer with User Defined Input Mode
♦ Stereo 715mW Speaker Output (R_L = 8Ω,
V_DD = 3.7V)
♦ Stereo 58mW Headphone Output (16Ω,
V_DD = 3.7V)
♦ Low 0.04% THD+N at 1kHz (Class D Power
Amplifier)
♦ Low 0.018% THD+N at 1kHz (Headphone
Amplifier)
♦ 88% Efficiency (R_L = 8Ω, P_OUT = 750mW)
♦ 1.6Ω Analog Switch for Speaker Amplifier Bypass
♦ High Speaker Amplifier PSRR (72dB at 217Hz)
♦ High Headphone Amplifier PSRR (84dB at 217Hz)
♦ I²C Control
♦ Hardware and Software Shutdown Mode
♦ Ultra-Low Click and Pop
♦ Robust Design with Current and Thermal
Protection
♦ Available in Space-Saving Package
5x6 UCSP (2.5mm x 3mm)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX9879ERV+
-40°C to +85°C 30 UCSP (5x6)
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
TOP VIEW
(BUMP SIDE DOWN)
1
2
3
4
5
6
A
C1P OUTL- PVDDL OUTL+ PGNDR OUTR-
B
C1N RXIN- PGNDL RXIN+ PGNDR PVDDR
C
V_SS GND GND GND GND OUTR+
D
HPL BIAS INB1 INA1 SCL SDA
E
HPR
V_DD
INB2 INA2 SHDN V_CCIO
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.