Datasheet
MAX9741
12W+12W, Low-EMI, Spread-Spectrum,
Stereo, Class D Amplifier
4 _______________________________________________________________________________________
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9741 toc01
OUTPUT POWER (W)
THD+N (%)
15105
0.1
1
10
0.01
020
R
L
= 8Ω
V
DD
= 24V
V
DD
= 18V
V
DD
= 12V
15
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9741 toc02
OUTPUT POWER (W)
THD+N (%)
0.01
0.1
1
10
0
R
L
= 4Ω
V
DD
= 24V
V
DD
= 18V
V
DD
= 12V
105
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9741 toc03
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.1
1
10
0.01
10 100k
P
OUT
= 500mW
P
OUT
= 8W
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX974 toc04
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.1
1
10
0.01
10 100k
P
OUT
= 8W
SSM
FFM
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9741 toc07
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
0
6
4
2
8
10
12
14
16
18
20
10 1613 19 22 25
R
L
= 8Ω
R
L
= 16Ω
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9741 toc05
OUTPUT POWER (W)
THD+N (%)
15105
0.1
1
10
0.01
020
f = 100Hz
f = 10kHz
f = 1kHz
EFFICIENCY vs. OUTPUT POWER
MAX9741 toc06
OUTPUT POWER (W)
EFFICIENCY (%)
161248
10
20
30
40
50
60
70
80
90
100
0
0
R
L
= 8Ω
V
DD
= 18V
V
DD
= 12V
V
DD
= 24V
OUTPUT POWER vs. LOAD RESISTANCE
MAX9741 toc08
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
10
2
4
6
8
10
12
14
16
18
20
0
1 100
THD+N = 10%
THD+N = 1%
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
MAX9741 toc09
FREQUENCY (Hz)
CMRR (dB)
10k1k100
-70
-60
-50
-40
-30
-20
-10
0
-80
10 100k
Typical Operating Characteristics
(V
DD
= 18V, R
L
= 8Ω, f
IN
= 1kHz, 33µH with 4Ω, 68µH with 8Ω, part in SSM mode, 136µH with 16Ω, measurement BW = 22Hz to
22kHz, unless otherwise noted.)