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MAX9700
1.2W, Low-EMI, Filterless,
Class D Audio Amplifier
General Description
Features
● Filterless Amplifier Passes FCC Radiated
The MAX9700 mono class D audio power amplifier
provides class AB amplifier performance with class D
efficiency, conserving board space and extending battery
life. Using a class D architecture, the MAX9700
delivers 1.2W into an 8Ω load while offering efficiencies
above 90%. A low-EMI modulation scheme renders the
traditional class D output filter unnecessary.
Emissions Standards with 100mm of Cable
● Unique Spread-Spectrum Mode Offers 5dB
Emissions Improvement Over Conventional Methods
● Optional External SYNC Input
● Simple Master-Slave Setup for Stereo Operation
● 94% Efficiency
The MAX9700 offers two modulation schemes: a fixed-
frequency (FFM) mode, and a spread-spectrum (SSM)
mode that reduces EMI-radiated emissions due to the
modulation frequency. Furthermore, the MAX9700 oscillator
can be synchronized to an external clock through the
SYNC input, allowing the switching frequency to be user
defined. The SYNC input also allows multiple MAX9700s
to be cascaded and frequency locked, minimizing
interference due to clock intermodulation. The device
utilizes a fully differential architecture, a full-bridged
output, and comprehensive click-and-pop suppression.
The gain of the MAX9700 is set internally (MAX9700A:
6dB, MAX9700B: 12dB, MAX9700C: 15.6dB, MAX9700D:
20dB), further reducing external component count.
● 1.2W into 8Ω
● Low 0.01% THD+N
● High PSRR (72dB at 217Hz)
● Integrated Click-and-Pop Suppression
● Low Quiescent Current (4mA)
● Low-Power Shutdown Mode (0.1μA)
● Short-Circuit and Thermal-Overload Protection
● Available in Thermally Efficient, Space-Saving
Packages
• 10-Pin TDFN (3mm x 3mm x 0.8mm)
• 10-Pin μMAX
• 12-Bump UCSP (1.5mm x 2mm x 0.6mm)
Ordering Information
The MAX9700 features high 72dB PSRR, a low 0.01%
THD+N, and SNR in excess of 90dB. Short-circuit and
thermal-overload protection prevent the device from
damage during a fault condition. The MAX9700 is available
PIN-
PACKAGE
TOP
MARK
PART
TEMP RANGE
MAX9700AETB+
MAX9700AEUB+
-40°C to +85°C 10 TDFN-EP* ACM
-40°C to +85°C 10 µMAX
—
—
®
in 10-pin TDFN (3mm x 3mm x 0.8mm), 10-pin μMAX ,
MAX9700AEBC+T -40°C to +85°C 12 UCSP
and 12-bump UCSP™ (1.5mm x 2mm x 0.6mm) packages.
The MAX9700 is specified over the extended -40°C to
+85°C temperature range.
MAX9700BETB+
MAX9700BEUB+
-40°C to +85°C 10 TDFN-EP*
-40°C to +85°C 10 µMAX
ACI
—
MAX9700BEBC+T -40°C to +85°C 12 UCSP
—
Applications
*EP = Exposed pad.
Ordering Information continued and Selector Guide appears
at end of data sheet.
● Cellular Phones
● PDAs
● MP3 Players
● Portable Audio
Block Diagram
Pin Configurations
V
DD
TOP VIEW
V
1
2
3
4
5
10 PV
DD
DD
IN+
IN-
9
8
7
6
OUT-
DIFFERENTIAL
AUDIO INPUT
MODULATOR
AND H-BRIDGE
MAXꢀ700
OUT+
PGND
SYNC
GND
SHDN
SYNC
INPUT
OSCILLATOR
MAXꢀ700
TDFN/µMAX
Pin Configurations continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
μMAX is a registered trademark of Maxim Integrated Products, Inc.
19-3030; Rev 3; 3/18