MAX9775 Datasheet, PDF (1/37 Pages) Maxim Integrated Products – 2 x 1.5W, Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier

19-0746; Rev 1; 7/07
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2 x 1.5W, Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
General Description
The MAX9775/MAX9776 combine a high-efficiency
Class D, stereo/mono audio power amplifier with a
mono DirectDrive™ receiver amplifier and a stereo
DirectDrive headphone amplifier.
Maxim’s 3rd-generation, ultra-low-EMI, Class D audio
power amplifiers provide Class AB performance with
Class D efficiency. The MAX9775/MAX9776 deliver
1.5W per channel into a 4Ω load from a 5V supply and
offer efficiencies up to 79%. Active emissions limiting
circuitry and spread-spectrum modulation greatly
reduce EMI, eliminating the need for output filtering
found in traditional Class D devices.
The MAX9775/MAX9776 utilize a fully differential archi-
tecture, a full-bridged output, and comprehensive click-
and-pop suppression. A 3D stereo enhancement
function allows the MAX9775 to widen the stereo sound
field immersing the listener in a cleaner, richer sound
experience than typically found in portable applications.
The devices utilize a flexible, user-defined mixer archi-
tecture that includes an input mixer, volume control, and
output mixer. All control is done through I²C.
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.
The MAX9775/MAX9776 are available in a 32-pin TQFN
(5mm x 5mm) or a 32-bump UCSP™ (3mm x 3mm)
package and specified over the extended -40°C to
+85°C temperature range.
Applications
Cell Phones
Portable Multimedia Players
Handheld Gaming Consoles
†_{U.S. Patent# 7,061,327}
SINGLE SUPPLY 2.7V TO 5.5V
Features
o Unique Spread-Spectrum Modulation and Active
Emissions Limiting Significantly Reduces EMI
o 3D Stereo Enhancement (MAX9775 Only)
o Up to 3 Stereo Inputs
o 1.5W Stereo Speaker Output (4Ω, V_DD = 5V)
o 50mW Mono Receiver/Stereo Headphone Outputs
(32Ω, V_DD = 3.3V)
o High PSRR (68dB at 217Hz)
o 79% Efficiency (V_DD = 3.3V, R_L = 8Ω, P_OUT =
470mW)
o I²C Control—Input Configuration, Volume Control,
Output Mode
o Click-and-Pop Suppression
o Low Total Harmonic Distortion (0.03% at 1kHz)
o Current-Limit and Thermal Protection
Ordering Information
PART
PIN-
PACKAGE
PKG
CODE
CLASS D
AMPLIFIER
MAX9775ETJ+* 32 TQFN-EP** T3255-4
Stereo
MAX9775EBX+T* 32 UCSP-32
B36-4
Stereo
MAX9776ETJ+ 32 TQFN-EP** T3255-4
Mono
MAX9776EBX+T 32 UCSP-32
B36-4
Mono
Note: All devices are specified over the -40°C to +85°C oper-
ating temperature range.
+Denotes lead-free package.
*Future product—contact factory for availability.
**EP = Exposed pad.
Pin Configurations appear at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
Simplified Block Diagrams
SINGLE SUPPLY 2.7V TO 5.5V
GAIN
CONTROL
MIXER/
MUX
3D
SOUND
CONTROL
I²C
INTERFACE
GAIN
CONTROL
MIXER/
MUX
I²C
INTERFACE
MAX9775
MAX9776
________________________________________________________________ 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.