19-2917; Rev 1; 1/04
500mW, Low EMI, Filterless,
Class D Audio Amplifier
General Description
The MAX9712 mono class D audio power amplifier pro-
vides class AB amplifier performance with class D effi-
ciency, conserving board space, and extending battery
life. Using a class D architecture, the MAX9712 delivers
up to 500mW into an 8鈩?load while offering efficiencies
above 85%. A patented, low EMI modulation scheme
renders the traditional class D output filter unnecessary.
The MAX9712 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 MAX9712 oscil-
lator 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
MAX9712s to be cascaded and frequency locked, mini-
mizing interference due to clock intermodulation. The
device utilizes a fully differential architecture, a full-
bridged output, and comprehensive click-and-pop sup-
pression. The gain is internally set to +4V/V, further
reducing external component count.
The MAX9712 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 MAX9712 is avail-
able in 10-pin TDFN (3mm
鉁?/div>
3mm
鉁?/div>
0.8mm), 10-pin
碌MAX, and 12-bump UCSP鈩?(1.5mm
鉁?/div>
2mm
鉁?/div>
0.6mm)
packages. The MAX9712 is specified over the extended
-40擄C to +85擄C temperature range.
Features
鈾?/div>
Filterless Amplifier Passes FCC Radiated
Emissions Standards with 100mm of Cable
鈾?/div>
Unique Spread-Spectrum Mode Offers 5dB
Emissions Improvement Over Conventional
Methods
鈾?/div>
Optional External SYNC Input
鈾?/div>
Simple Master-Slave Setup for Stereo Operation
鈾?/div>
85% Efficiency
鈾?/div>
Up to 500mW into 8鈩?/div>
鈾?/div>
Low 0.01% THD+N
鈾?/div>
High PSRR (72dB at 217Hz)
鈾?/div>
Integrated Click-and-Pop Suppression
鈾?/div>
鈾?/div>
鈾?/div>
鈾?/div>
Low Quiescent Current (4mA)
Low-Power Shutdown Mode (0.1碌A(chǔ))
Short-Circuit and Thermal-Overload Protection
Available in Thermally Efficient, Space-Saving
Packages
10-Pin TDFN (3mm
鉁?/div>
3mm
鉁?/div>
0.8mm)
10-Pin 碌MAX
12-Bump UCSP (1.5mm
鉁?/div>
2mm
鉁?/div>
0.6mm)
MAX9712
Ordering Information
PART
MAX9712ETB
MAX9712EUB
MAX9712EBC-T
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
PIN/BUMP-
PACKAGE
10 TDFN
10 碌MAX
12 UCSP-12
TOP
MARK
AAI
鈥?/div>
ABN
Applications
Cellular Phones
PDAs
MP3 Players
Portable Audio
Simplified Block Diagram
V
DD
Pin Configurations
TOP VIEW
MODULATOR
AND H-BRIDGE
DIFFERENTIAL
AUDIO INPUT
V
DD
1
IN+
IN-
2
3
4
5
10
PV
DD
9
OUT-
OUT+
PGND
SYNC
MAX9712
8
7
6
SYNC
INPUT
OSCILLATOR
GND
MAX9712
SHDN
TDFN/碌MAX
UCSP is a trademark of Maxim Integrated Products, Inc.
Pin Configurations continued at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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