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MAX9712
500mW, Low EMI, Filterless,
Class D Audio Amplifier
4 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
DD
= 3.3V, V
SYNC
= GND, T
A
= +25°C, unless otherwise noted.)
100
0 0.1 0.2 0.3 0.4 0.5
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9712 TOC04
OUTPUT POWER (W)
THD+N (%)
V
DD
= 3.3V
R
L
= 8Ω
f = 10kHz
f = 1kHz
f = 100Hz
100
0 0.2 0.4 0.6 0.8 1.0
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9712 TOC05
OUTPUT POWER (W)
THD+N (%)
V
DD
= 5V
R
L
= 16Ω
f = 10kHz
f = 1kHz
f = 100Hz
100
0 0.1 0.2 0.3 0.4
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9712 TOC06
OUTPUT POWER (W)
THD+N (%)
V
DD
= 3.3V
R
L
= 6Ω
f = 1kHz
f = 100Hz
f = 10kHz
100
0 0.1 0.2 0.3 0.4 0.5
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9712 TOC07
OUTPUT POWER (W)
THD+N (%)
V
DD
= 2.5V
R
L
= 8Ω
V
CM
= 1.25V
NO INPUT CAPACITORS
DIFFERENTIAL
INPUT
SINGLE-ENDED
100
0 0.1 0.2 0.3 0.4 0.5
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9712 TOC08
OUTPUT POWER (W)
THD+N (%)
V
DD
= 3.3V
R
L
= 8Ω
FFM
(SYNC FLOATING)
FFM
(SYNC = GND)
SSM
(SYNC = V
DD
)
100
0 0.1 0.2 0.3 0.4 0.5 0.6
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9712 TOC09
OUTPUT POWER (W)
THD+N (%)
V
DD
= 3.3V
R
L
= 8Ω
SYNC = 3.3V
P-P
50% DUTY CYCLE
SQUARE WAVE
f
SYNC
= 1.4MHz
f
SYNC
= 2MHz
f
SYNC
= 800kHz
0
30
20
10
50
40
90
80
70
60
100
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
EFFICIENCY vs. OUTPUT POWER
MAX9712TOC11
OUTPUT POWER (W)
EFFICIENCY (%)
R
L
= 8Ω
V
DD
= 5V
f = 1kHz
R
L
= 16Ω
0
30
20
10
50
40
90
80
70
60
100
0 0.1 0.2 0.3 0.4 0.5
EFFICIENCY vs. OUTPUT POWER
MAX9712TOC12
OUTPUT POWER (W)
EFFICIENCY (%)
R
L
= 8Ω
R
L
= 6Ω
V
DD
= 3.3V
f = 1kHz
R
L
= 16Ω