MAX9877AERP Datasheet, PDF (1/31 Pages) Maxim Integrated Products – Low RF Susceptibility, Mono Audio Subsystem with DirectDrive Headphone Amplifier

19-4651; Rev 0; 5/09
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Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
General Description
The MAX9877A 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 MAX9877A 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 modula-
tion** greatly reduces EMI while eliminating the need for
output filtering used in traditional Class D devices.
The stereo Class AB headphone amplifier in the
MAX9877A 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 MAX9877A.
The MAX9877A is available in a thermally efficient,
space-saving 20-bump MaxFilm package.
Applications
Cell Phones
Portable Multimedia Players
*U.S. Patent #7,190,225.
**U.S. Patent #6,847,257.
Simplified Block Diagram
SINGLE SUPPLY
2.7V TO 5.25V
Features
o Low Emissions, Filterless Class D Amplifier
Achieves Better than 10dB Margin Under EN55022
Class B Limits
o Low RF Susceptibility Design Rejects TDMA
Noise from GSM Radios
o Input Mixer with User-Defined Input Mode
o 725mW Speaker Output (R_SPK = 8Ω, PV_DD = 3.7V)
o 53mW Headphone Output (R_HP = 16Ω, V_DD = 3.7V)
o Low 0.05% THD+N at 1kHz (Class D Power
Amplifier)
o Low 0.016% THD+N at 1kHz (Headphone
Amplifier)
o 87% Efficiency (R_SPK = 8Ω, P_OUT = 750mW)
o 1.6Ω Analog Switch for Speaker Amplifier Bypass
o High Speaker Amplifier PSRR (72dB at 217Hz)
o High Headphone Amplifier PSRR (84dB at 217Hz)
o I²C Control
o Hardware and Software Shutdown Mode
o Click-and-Pop Suppression
o Current-Limit and Thermal Protection
o Available in a Space-Saving, 2.5mm x 2.0mm
MaxFilm Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX9877AERP+T
-40°C to +85°C 20 MaxFilm (5x4)
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
TOP VIEW
(BUMP SIDE DOWN)
1
Pin Configuration
2
3
4
5
PREAMPLIFIER
VOLUME
CONTROL
MIXER/MUX
I²C
INTERFACE
MAX9877A
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-
MaxFilm
________________________________________________________________ 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.