MAX9877 Datasheet, PDF (1/30 Pages) Maxim Integrated Products – Low RF Susceptibility, Mono Audio Subsystem with DirectDrive Headphone Amplifier

19-4076; Rev 0; 7/08
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Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
General Description
The MAX9877 combines a high-efficiency Class D
audio power amplifier with a stereo Class AB capacitor-
less DirectDrive^® headphone amplifier. Maxim’s 3rd
generation, filterless Class D amplifier with active emis-
sions limiting technology provides Class AB perfor-
mance with Class D efficiency.
The MAX9877 delivers up to 725mW from a 3.7V supply
into an 8Ω load with 87% efficiency to extend battery life.
The filterless modulation scheme combined with active
emissions limiting circuitry and spread-spectrum modu-
lation greatly reduces EMI while eliminating the need for
output filtering used in traditional Class D devices.
The stereo Class AB headphone amplifier in the
MAX9877 uses Maxim’s patented DirectDrive architec-
ture, that 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 MAX9877.
The MAX9877 is available in a thermally efficient,
space-saving 20-bump WLP package.
Applications
Cell Phones
Portable Multimedia Players
Simplified Block Diagram
SINGLE SUPPLY
2.7V TO 5.25V
Features
♦ Low Emissions, Filterless Class D Amplifier
Achieves Better than 10dB Margin Under EN55022
Class B Limits
♦ Low RF Susceptibility Design Rejects TDMA
Noise from GSM Radios
♦ Input Mixer with User-Defined Input Mode
♦ 725mW Speaker Output (R_SPK = 8Ω, PV_DD = 3.7V)
♦ 53mW Headphone Output (R_HP = 16Ω, V_DD = 3.7V)
♦ Low 0.05% THD+N at 1kHz (Class D Power
Amplifier)
♦ Low 0.016% THD+N at 1kHz (Headphone
Amplifier)
♦ 87% Efficiency (R_SPK = 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
♦ Click-and-Pop Suppression
♦ Current-Limit and Thermal Protection
♦ Available in a Space-Saving, 2.5mm x 2.0mm WLP
Package
Ordering Information
PART
TEMP RANGE
MAX9877EWP+TG45 -40°C to +85°C
+Denotes a lead-free package.
T = Tape and reel.
G45 indicates protective die coating.
PIN-PACKAGE
20 WLP (5x4)
Pin Configuration
TOP VIEW
(BUMP SIDE DOWN)
1
2
3
4
5
PREAMPLIFIER
VOLUME
CONTROL
MIXER/MUX
I²C
INTERFACE
MAX9877
VOLUME
CONTROL
BYPASS
A
HPR
HPL
VSS
C1N
C1P
B
VDD BIAS SDA RXIN+ OUT+
C
INB2 INB1 SCL PGND PV_DD
D
INA2 INA1 GND RXIN- OUT-
WLP
________________________________________________________________ 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.