19-3039; Rev 6; 12/06
KIT
ATION
EVALU
BLE
AVAILA
6W, Filterless, Spread-Spectrum
Mono/Stereo Class D Amplifiers
General Description
Features
♦
Filterless Class D Amplifier
♦
Unique Spread-Spectrum Mode Offers 5dB
Emissions Improvement Over Conventional
Methods
♦
Up to 85% Efficient
♦
6W Output Power into 8Ω
♦
Low 0.07% THD+N
♦
High PSRR (76dB at 1kHz)
♦
10V to 25V Single-Supply Operation
♦
Differential Inputs Minimize Common-Mode Noise
♦
Pin-Selectable Gain Reduces Component Count
♦
Industry-Leading Integrated Click-and-Pop
Suppression
♦
Low Quiescent Current (18mA)
♦
Low-Power Shutdown Mode (0.2µA)
♦
Short-Circuit and Thermal-Overload Protection
♦
Available in Thermally Efficient, Space-Saving
Packages
32-Pin TQFN (5mm x 5mm x 0.8mm)–MAX9713
32-Pin TQFN (7mm x 7mm x 0.8mm)–MAX9714
MAX9713/MAX9714
The MAX9713/MAX9714 mono/stereo Class D audio
power amplifiers provide Class AB amplifier performance
with Class D efficiency, conserving board space and
eliminating the need for a bulky heatsink. Using a Class
D architecture, these devices deliver up to 6W while
offering greater than 85% efficiency. Proprietary and pro-
tected modulation and switching schemes render the tra-
ditional Class D output filter unnecessary.
The MAX9713/MAX9714 offer two modulation schemes:
a fixed-frequency mode (FFM), and a spread-spectrum
mode (SSM) that reduces EMI-radiated emissions due
to the modulation frequency. The device utilizes a fully
differential architecture, a full bridged output, and com-
prehensive click-and-pop suppression.
The MAX9713/MAX9714 feature high 76dB PSRR, low
0.07% THD+N, and SNR in excess of 95dB. Short-cir-
cuit and thermal-overload protection prevent the
devices from being damaged during a fault condition.
The MAX9713 is available in a 32-pin TQFN (5mm x
5mm x 0.8mm) package. The MAX9714 is available in a
32-pin TQFN (7mm x 7mm x 0.8mm) package. Both
devices are specified over the extended -40°C to
+85°C temperature range.
Applications
LCD Monitors
LCD TVs
Desktop PCs
LCD Projectors
High-End Notebook
Audio
Hands-Free Car
Phone Adaptors
PART
MAX9713ETJ+
MAX9714ETJ+
Ordering Information
TEMP RANGE
-40
o
C to +85
o
C
-40 C to +85 C
o
o
PIN-PACKAGE
32 TQFN-EP*
32 TQFN-EP*
AMP
Mono
Stereo
*EP
= Exposed paddle.
+Denotes
lead-free package.
Block Diagrams
0.47μF
INL+
H-BRIDGE
INL-
MAX9714
OUTL+
MAX9713
0.47μF
IN+
H-BRIDGE
IN-
OUT-
OUT+
0.47μF
OUTL-
0.47μF
0.47μF
INR+
H-BRIDGE
INR-
OUTR+
0.47μF
OUTR-
Pin Configurations appear at end of data sheet.
________________________________________________________________
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.
6W, Filterless, Spread-Spectrum
Mono/Stereo Class D Amplifiers
MAX9713/MAX9714
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
V
DD
to PGND, AGND .............................................................30V
OUTR_, OUTL_, C1N..................................-0.3V to (V
DD
+ 0.3V)
C1P............................................(V
DD
- 0.3V) to (CHOLD + 0.3V)
CHOLD ........................................................(V
DD
- 0.3V) to +40V
All Other Pins to GND.............................................-0.3V to +12V
Duration of OUTR_/OUTL_
Short Circuit to GND, V
DD
......................................Continuous
Continuous Input Current (V
DD
, PGND, AGND) ...................1.6A
Continuous Input Current (all other pins)..........................±20mA
Continuous Power Dissipation (T
A
= +70°C)
Single-Layer Board:
MAX9713 32-Pin TQFN (derate 21.3mW/°C
above +70°C)..........................................................1702.1mW
MAX9714 32-Pin TQFN (derate 27mW/°C
above +70°C)..........................................................2162.2mW
Multilayer Board:
MAX9713 32-Pin TQFN (derate 34.5mW/°C
above +70°C)..........................................................2758.6mW
MAX9714 32-Pin TQFN (derate 37mW/°C
above +70°C)..........................................................2963.0mW
Junction Temperature ......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
DD
= 15V, GND = PGND = 0V,
SHDN
≥
V
IH
, A
V
= 16dB, C
SS
= C
IN
= 0.47µF, C
REG
= 0.01µF, C1 = 100nF, C2 = 1µF, FS1 = FS2 =
GND (f
S
= 330kHz), R
L
connected between OUTL+ and OUTL- and OUTR+ and OUTR-, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
GENERAL
Supply Voltage Range
Quiescent Current
Shutdown Current
Turn-On Time
Amplifier Output Resistance in
Shutdown
V
DD
I
DD
I
SHDN
t
ON
C
SS
= 470nF
C
SS
= 180nF
SHDN
= GND
A
V
= 13dB
Input Impedance
R
IN
A
V
= 16dB
A
V
= 19.1dB
A
V
= 22.1dB
G1 = L, G2 = L
Voltage Gain
A
V
G1 = L, G2 = H
G1 = H, G2 = L
G1 = H, G2 = H
Gain Matching
Output Offset Voltage
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
(Note 3)
V
OS
CMRR
PSRR
f
IN
= 1kHz, input referred
V
DD
= 10V to 25V
200mV
P-P
ripple
f
RIPPLE
= 1kHz
f
RIPPLE
= 20kHz
54
Between channels (MAX9714)
150
35
30
23
20
21.9
18.9
12.8
15.9
Inferred from PSRR test
R
L
=
∞
MAX9713
MAX9714
10
10
18
0.2
100
50
330
58
48
39
31
22.1
19.1
13
16
0.5
±6
60
76
76
60
dB
±30
80
65
55
42
22.3
19.3
13.2
16.3
%
mV
dB
dB
kΩ
25
17.5
23
1.5
V
mA
µA
ms
kΩ
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
6W, Filterless, Spread-Spectrum
Mono/Stereo Class D Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 15V, GND = PGND = 0V,
SHDN
≥
V
IH
, A
V
= 16dB, C
SS
= C
IN
= 0.47µF, C
REG
= 0.01µF, C1 = 100nF, C2 = 1µF, FS1 = FS2 =
GND (f
S
= 330kHz), R
L
connected between OUTL+ and OUTL- and OUTR+ and OUTR-, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
Output Power
Total Harmonic Distortion Plus
Noise
SYMBOL
P
OUT
THD+N
THD+N = 10%,
f = 1kHz
CONDITIONS
R
L
= 16Ω
R
L
= 8Ω
MIN
TYP
8
6
0.07
94
88
97
91
300
335
460
236
335
85
75
2.5
0.8
±1
%
370
kHz
dB
MAX
UNITS
W
%
MAX9713/MAX9714
f
IN
= 1kHz, either FFM or SSM, R
L
= 8Ω,
P
OUT
= 4W
R
L
= 8Ω, P
OUT
=
4W, f = 1kHz
FS1 = L, FS2 = L
BW = 22Hz to
22kHz
A-weighted
FFM
SSM
FFM
SSM
Signal-to-Noise Ratio
SNR
Oscillator Frequency
f
OSC
FS1 = L, FS2 = H
FS1 = H, FS2 = L
FS1 = H, FS2 = H (spread-spectrum mode)
P
OUT
= 5W, f
IN
= 1kHz, R
L
= 16Ω
P
OUT
= 4W, f = 1kHz, R
L
= 8Ω
V
IH
V
IL
Efficiency
DIGITAL INPUTS (SHDN, FS_, G_)
Input Thresholds
Input Leakage Current
η
V
µA
Note 1:
All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design.
Note 2:
Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For R
L
= 8Ω, L = 68µH.
For R
L
= 16Ω, L = 136µH.
Note 3:
PSRR is specified with the amplifier inputs connected to GND through C
IN
.
_______________________________________________________________________________________
3
6W, Filterless, Spread-Spectrum
Mono/Stereo Class D Amplifiers
MAX9713/MAX9714
Typical Operating Characteristics
(136µH with 16Ω, 68µH with 8Ω, part in SSM mode, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9713 toc01
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9713 toc02
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
V
DD
= +15V
A
V
= 13dB
R
L
= 16Ω
MAX9713 toc03
10
10
V
DD
= +15V
A
V
= 13dB
R
L
= 8Ω
V
DD
= +20V
A
V
= 13dB
R
L
= 8Ω
P
OUT
= 100mW
P
OUT
= 4W
10
THD+N (%)
THD+N (%)
THD+N (%)
1
1
P
OUT
= 100mW
P
OUT
= 4W
1
P
OUT
= 5W
0.1
0.1
0.1
P
OUT
= 55mW
0.01
10
100
1k
FREQUENCY (Hz)
10k
100k
0.01
10
100
1k
FREQUENCY (Hz)
10k
100k
0.01
10
100
1k
FREQUENCY (Hz)
10k
100k
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9713 toc04
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9713 toc05
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
V
DD
= 15V
A
V
= 13dB
R
L
= 8Ω
MAX9713 toc06
10
10
V
DD
= +20V
A
V
= 13dB
R
L
= 16Ω
V
DD
= +15V
A
V
= 13dB
P
OUT
= 4W
R
L
= 8Ω
100
10
1
THD+N (%)
THD+N (%)
1
THD+N (%)
1
f = 1kHz
f = 10kHz
0.1
SSM
0.1
P
OUT
= 7.5W
0.1
0.01
P
OUT
= 120mW
0.01
10
100
1k
FREQUENCY (Hz)
10k
100k
FFM
0.01
10
100
1k
FREQUENCY (Hz)
10k
100k
0.001
0
1
f = 100Hz
2
3
4
5
6
7
OUTPUT POWER (W)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9713 toc07
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9713 toc08
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
V
DD
= 20V
A
V
= 13dB
R
L
= 16Ω
MAX9713 toc09
100
10
V
DD
= 20V
A
V
= 13dB
R
L
= 8Ω
100
10
V
DD
= 15V
A
V
= 13dB
R
L
= 16Ω
100
10
THD+N (%)
THD+N (%)
1
f = 1kHz
1
f = 1kHz
0.1
f = 10kHz
0.01
f = 100Hz
THD+N (%)
1
f = 1kHz
0.1
f = 10kHz
0.01
f = 100Hz
0.1
f = 10kHz
f = 10kHz
0.01
f = 100Hz
0.001
0
1
2
3
4
5
6
7
OUTPUT POWER (W)
0.001
0
2
4
OUTPUT POWER (W)
6
8
0.001
0
5
10
15
OUTPUT POWER (W)
4
_______________________________________________________________________________________
6W, Filterless, Spread-Spectrum
Mono/Stereo Class D Amplifiers
MAX9713/MAX9714
Typical Operating Characteristics (continued)
(136µH with 16Ω, 68µH with 8Ω, part in SSM mode, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9713 toc10
EFFICIENCY vs. OUTPUT POWER
MAX9713 toc11
EFFICIENCY vs. OUTPUT POWER
90
80
EFFICIENCY (%)
70
60
50
40
30
20
R
L
= 8Ω
10
V
DD
= 15V
A
V
= 13dB
f = 1kHz
R
L
= 8Ω
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
R
L
= 16Ω
R
L
= 16Ω
THD+N (%)
1
SSM
0.1
FFM
0.01
R
L
= 8Ω
0.001
0
2
4
OUTPUT POWER (W)
6
8
0
0
2
4
6
OUTPUT POWER (W)
V
DD
= 15V
A
V
= 13dB
8
10
10
0
0
3
6
OUTPUT POWER (W)
V
DD
= 20V
A
V
= 13dB
9
12
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9713 toc13
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9713 toc14
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
-10
-20
-30
CMRR (dB)
-40
-50
-60
-70
-80
-90
V
DD
= 15V
A
V
= 13dB
R
L
= 8Ω
MAX9713 toc15
8
7
OUTPUT POWER (W)
6
5
4
3
2
1
0
A
V
= 13dB
THD+N = 10%
R
L
= 8Ω
10
13
16
19
22
10
9
8
OUTPUT POWER (W)
7
6
5
4
3
2
1
0
V
DD
= 15V
A
V
= 13dB
THD+N = 10%
0
THD+N = 1%
25
1
10
LOAD RESISTANCE (Ω)
100
10
100
1k
FREQUENCY (Hz)
10k
100k
SUPPLY VOLTAGE (V)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9713 toc16
CROSSTALK vs. FREQUENCY
MAX9713 toc17
OUTPUT FREQUENCY SPECTRUM
0
OUTPUT MAGNITUDE (dB)
-20
-40
-60
-80
-100
-120
-140
100
0
5
10
FREQUENCY (Hz)
15
20
FFM MODE
P
OUT
= 5W
f =1kHz
R
L
= 8Ω
UNWEIGHTED
MAX9713 toc18
0
-10
-20
PSRR (dB)
-30
-40
-50
-60
-70
10
100
1k
V
DD
= 15V
A
V
= 13dB
V
RIPPLE
= 200mV
P-P
R
L
= 16Ω
0
-20
CROSSTALK (dB)
-40
-60
-80
-100
OUTPUT REFERRED
A
V
= 13dB
20
LEFT TO RIGHT
RIGHT TO LEFT
-120
10k
100k
0.01
0.1
1
FREQUENCY (Hz)
10
FREQUENCY (Hz)
_______________________________________________________________________________________
MAX9713 toc12
100
100
100
5
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