19-0866; Rev 0; 7/07
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
MAX796
General Description
The MAX9796 combines a high-efficiency Class D, mono
audio power amplifier with a mono DirectDrive™ receiver
amplifier and a stereo DirectDrive headphone amplifier.
Features
o Unique Spread-Spectrum Modulation and Active
Emissions Limiting Significantly Reduces EMI
o Up to 3 Stereo Inputs
o 2.3W Mono Speaker Output (4Ω, V
= 5V)
DD
Maxim’s 3rd-generation, ultra-low EMI, Class D audio
power amplifiers provide Class AB performance with
Class D efficiency. The MAX9796 delivers 2.3W into a 4Ω
load from a 5V supply and offers efficiencies up to 80%.
Active emissions limiting circuitry and spread-spectrum
modulation greatly reduce EMI, eliminating the need for
output filtering found in traditional Class D devices.
o 50mW Mono Receiver/Stereo Headphone Outputs
(32Ω, V = 3.3V)
DD
o High PSRR (68dB at 217Hz)
o 80% Efficiency (V
= 3.3V, R = 8Ω, P
=
OUT
DD
L
600mW)
2
o I C Control—Input Configuration, Volume
The MAX9796 features a fully differential architecture, a
full-bridged output, and comprehensive click-and-pop
suppression. The device utilizes a flexible, user-defined
mixer architecture that includes an input mixer, volume
control, and output mixer. All controls are done through
Control, Output Mode
o Click-and-Pop Suppression
o Low Total Harmonic Distortion (0.03% at 1kHz)
o Current-Limit and Thermal Protection
2
an I C interface.
o Available in Space-Saving, 36-Bump UCSP
(3mm x 3mm)
The mono receiver amplifier and stereo headphone
amplifier use Maxim’s patented† DirectDrive architecture,
that produces a ground-referenced output from a single
supply, eliminating the need for large DC-blocking
capacitors, saving cost, space, and component height.
Ordering Information
PIN-
PACKAGE
PKG
CODE
PART
TEMP RANGE
The MAX9796 is available in a 36-bump UCSP™ (3mm
x 3mm) package and is specified over the extended
-40°C to +85°C temperature range.
MAX9796EBX+T -40°C to +85°C 36 UCSP-36*
B36-4
+Denotes a lead-free package.
*Four center bumps depopulated.
†
U.S. Patent # 7,061,327
Pin Configuration
Applications
Cell Phones
TOP VIEW
(BUMPS ON BOTTOM)
Portable Multimedia Players
Handheld Gaming Consoles
1
2
3
4
5
6
Simplified Block Diagram
CPV
C1P
CPGND
C1N
CPV
HPL
DD
SS
A
B
SINGLE SUPPLY 2.7V TO 5.5V
PV
DD
I.C.
SDA
VBIAS
V
INC1
HPR
SS
GAIN
CONTROL
OUT+
PGND
OUT-
INC2
INB2
INB1
OUTRx
C
D
E
MAX9796
SCL
V
DD
MIXER/
MUX
2
I C
SHDN
INA1
INA2
I.C.
INTERFACE
PV
DD
OUT-
PGND
OUT+
PV
GND
DD
F
MAX9796
UCSP
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ 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.