19-3608; Rev 0; 6/05
1.8W, Filterless, Stereo, Class D Audio Power
Amplifier and DirectDrive Stereo Headphone Amplifier
General Description
Features
♦ Patented Spread-Spectrum Modulation Reduces
The MAX9702 combines a highly efficient Class D
speaker amplifier with a high-linearity Class AB head-
phone amplifier. This ensures maximum battery life in
speaker mode and maximum performance in head-
phone mode. The MAX9702 delivers up to 1.8W per
channel into an 8Ω load from a 5V power supply.
Maxim’s 2nd-generation, spread-spectrum modulation
scheme renders the traditional Class D output filter
unnecessary.
EMI Emissions
♦ Programmable Mono, Stereo, Mute, and Mix
Functions
♦ 1.1W Stereo Output (8Ω, V
= 5V)
DD
♦ 48mW Headphone Output (32Ω, V
= 3.3V)
DD
♦ 95% Efficiency (R = 8Ω, P = 1.1W)
L
O
♦ High 73dB PSRR (f = 217Hz)
♦ I2C Programmable Gain Up to +21dB
The MAX9702 speaker amplifier offers two modulation
schemes: a fixed-frequency (FFM) mode and a spread-
spectrum (SSM) mode that reduces EMI-radiated emis-
sions. The MAX9702 speaker amplifier features a fully
differential architecture, full-bridged (BTL) output, and
comprehensive click-and-pop suppression. The
MAX9702 speaker amplifier features high 75dB PSRR,
low 0.07% THD+N, and SNR in excess of 97dB. Short-
circuit and thermal-overload protection prevent the
device from being damaged during a fault condition.
♦ Integrated Click-and-Pop Suppression
♦ Low-Power Shutdown Mode (0.1µA)
♦ Short-Circuit and Thermal-Overload Protection
♦ ±8kV (HBM) ESD-Protected Headphone Driver
Outputs
Ordering Information
I2C SLAVE
ADDRESS
PKG
CODE
PART
PIN–PACKAGE
The headphone amplifier uses Maxim’s patented
DirectDriveTM architecture that produces a ground-ref-
erenced output from a single supply, eliminating the
need for large DC-blocking capacitors, saving cost,
board space, and component height. A high 80dB
PSRR and low 0.02% THD+N ensures clean, low-distor-
tion amplification of the audio signal.
28 TSSOP
MAX9702EUI+
MAX9702BEUI+
MAX9702ETI+
MAX9702BETI+
1001100
1001110
1001100
1001110
U28-1
U28-1
28 TSSOP
28 TQFN-EP*
28 TQFN-EP*
T2855-6
T2855-6
Note: All devices specified for -40°C to +85°C operating tem-
2
An I C interface sets the speaker and headphone gain,
mono, stereo, and mute functions.
perature range.
*EP = Exposed paddle.
The MAX9702 is available in 28-pin thin QFN-EP (5mm
x 5mm x 0.8mm) and 28-pin TSSOP packages. The
MAX9702 is specified over the extended -40°C to
+85°C temperature range.
+ Denotes lead-free package.
Simplified Block Diagram
Applications
RIGHT MODULATOR
AND H-BRIDGE
INR
∑
∑
Cellular Phones
Notebook PCs
GAIN
CONTROL
INM
INL
PDAs
LEFT MODULATOR
AND H-BRIDGE
Handheld Gaming Consoles
Pin Configurations appear at end of data sheet.
SHDN
SDA
SCL
2
*Purchase of I C components from Maxim Integrated Products,
Inc. or one of its sublicensed Associated Companies, conveys
SYNC
OSCILLATOR
SYNC_OUT
2
a license under the Philips I C Patent Rights to use these com-
2
ponents in an I C system, provided that the system conforms
MAX9702
2
to the I C Standard Specification as defined by Philips.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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