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MAX9768
10W Mono Class D Speaker
Amplifier with Volume Control
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7
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9768
toc04
FREQUENCY (Hz)
THD+N
(%)
10k
1k
100
0.1
0.01
1
10
0.001
10
100k
PVDD = 5V
RL = 8
Ω
PWM MODE
OUTPUT POWER = 300mW
OUTPUT POWER = 800mW
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9768
toc05
FREQUENCY (Hz)
THD+N
(%)
0.1
0.01
1
10
0.001
PVDD = 12V
RL = 8
Ω
FILTERLESS MODULATION
POUT = 4W
10k
1k
100
10
100k
FIXED-FREQUENCY
MODULATION
SPREAD-SPECTRUM
MODULATION
MAX9768
toc06
FREQUENCY (Hz)
THD+N
(%)
0.1
0.01
1
10
0.001
PVDD = 12V
RL = 8
Ω
PWM MODE
POUT = 4W
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
10k
1k
100
10
100k
FIXED-FREQUENCY
MODULATION
SPREAD-SPECTRUM
MODULATION
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9768
toc07
OUTPUT POWER (W)
THD+N
(%)
10
8
46
2
0.1
0.01
1
100
10
0.001
012
PVDD = 12V
RL = 8
Ω
FILTERLESS MODULATION
fIN = 10kHz
fIN = 100Hz
fIN = 1kHz
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9768
toc08
OUTPUT POWER (W)
THD+N
(%)
10
8
46
2
0.1
0.01
1
100
10
0.001
0
PVDD = 12V
RL = 8
Ω
PWM MODE
fIN = 10kHz
fIN = 100Hz
fIN = 1kHz
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9768
toc09
OUTPUT POWER (W)
THD+N
(%)
2.0
1.0
1.5
0.5
0.1
0.01
1
100
10
0.001
0
PVDD = 5V
RL = 8
Ω
FILTERLESS MODULATION
fIN = 10kHz
fIN = 100Hz
fIN = 1kHz
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9768
toc10
OUTPUT POWER (W)
THD+N
(%)
2.0
0.8
1.2
1.6
0.4
0.1
0.01
1
100
10
0.001
0
PVDD = 5V
RL = 8
Ω
PWM MODE
fIN = 10kHz
fIN = 100Hz
fIN = 1kHz
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9768
toc11
OUTPUT POWER (W)
THD+N
(%)
10
46
8
2
0.1
1
100
10
0.01
0
PVDD = 12V
RL = 8
Ω
fIN = 1kHz
FILTERLESS MODULATION
FIXED-FREQUENCY
MODULATION
SPREAD-SPECTRUM
MODULATION
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9768
toc12
OUTPUT POWER (W)
THD+N
(%)
10
46
8
2
0.1
1
100
10
0.01
0
PVDD = 12V
RL = 8
Ω
fIN = 1kHz
PWM MODE
FIXED-FREQUENCY
MODULATION
SPREAD-SPECTRUM
MODULATION
Typical Operating Characteristics (continued)
(VPVDD = 12V, VDD = 3.3V, VGND = VPGND = 0, VMUTE = 0; 0dB volume setting; all speaker load resistors connected between OUT+
and OUT-, RL = 8
Ω, unless otherwise noted. CBIAS = 2.2F, C1 = C2 = 0.1F, CIN = 0.47F, RIN = 20kΩ, RFB = 30kΩ, spread-spec-
trum modulation mode.)