1.2W, Low-EMI, Filterless,
Class D Audio Amplifier
Typical Operating Characteristics
(V
= 3.3V, SYNC = GND (SSM), T = +25°C, unless otherwise noted.)
A
DD
TOTAL HARMONIC DISTORTION PLUS NOISE
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
vs. FREQUENCY
1
1
1
V
= +3.3V
V
= +5V
V
= +3.3V
DD
DD
DD
R = 8Ω
R = 8Ω
L
R = 8Ω
L
L
P
= 125mW
OUT
0.1
0.1
0.1
P
= 300mW
OUT
P
= 300mW
SSM MODE
OUT
0.01
0.01
0.001
0.01
0.001
P
= 125mW
OUT
P
= 125mW
10k
OUT
FFM MODE
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT VOLTAGE
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
100
10
100
10
100
10
1
V
= 5V
V
= 5V
DD
L
DD
L
V
= 5V
DD
L
R = 4Ω
R = 16Ω
R = 8Ω
1
1
f = 1kHz
f = 100Hz
f = 100Hz
0.1
0.01
0.1
0.01
f = 10kHz
0.1
f = 10kHz
0.01
f = 10kHz
1.5
f = 1kHz
0.5 1.0 1.5 2.0
f = 100Hz
0.6 0.8
f = 1kHz
0.4
0.001
0.001
0.001
2.5 3.0 3.5
0
0.5
1.0
2.0
0
0
0.2
1.0
OUTPUT POWER (W)
OUTPUT POWER (W)
OUTPUT POWER (W)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
100
10
100
10
1
100
10
V
= 2.5V
V
= 5V
V
= 5V
DD
L
CM
DD
DD
R = 8Ω
V
NO INPUT CAPACITORS
f = 1kHz
R = 8Ω
f = 1kHz
R = 8Ω
= 1.25V
L
L
f
= 1.4MHz
FFM
(SYNC = GND)
SYNC
1
1
f
= 800kHz
SYNC
DIFFERENTIAL
INPUT
SSM
0.1
0.01
0.1
0.01
0.1
0.01
SINGLE ENDED
FFM
(SYNC FLOATING)
f
= 2MHz
SYNC
0.001
0.001
0.001
0
0.5
1.0
OUTPUT POWER (W)
1.5
2.0
0
0.1
0.2
0.3
0.4
0.5
0
0.5
1.0
1.5
2.0
OUTPUT POWER (W)
OUTPUT POWER (W)
4
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