1.2W, Low-EMI, Filterless,
Class D Audio Amplifier
Typical Operating Characteristics (continued)
(V
= 3.3V, SYNC = GND (SSM), T = +25°C, unless otherwise noted.)
DD
A
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. COMMON-MODE VOLTAGE
EFFICIENCY vs. OUTPUT POWER
EFFICIENCY vs. OUTPUT POWER
100
90
80
70
60
50
40
30
20
10
0
10
1
100
90
80
70
60
50
40
30
20
10
0
V
= 3.3V
DD
R = 8Ω
L
f = 1kHz
R = 8Ω
L
P
= 300mW
OUT
DIFFERENTIAL INPUT
R = 8Ω
L
R = 4Ω
L
R = 4Ω
L
0.1
V
= 5V
V
= 3.3V
DD
DD
f = 1kHz
f = 1kHz
0.01
1.0
0
0.5
1.0
1.5
2.0
2.5
3.0
0
0.5
1.5
2.0
2.5
3.0
0
0.3
0.6
0.9
1.2
1.5
OUTPUT POWER (W)
COMMON-MODE VOLTAGE (V)
OUTPUT POWER (W)
OUTPUT POWER vs.
SUPPLY VOLTAGE
EFFICIENCY
vs. SYNC INPUT FREQUENCY
EFFICIENCY vs. SUPPLY VOLTAGE
100
90
80
70
60
50
40
30
20
10
0
3.5
3.0
2.5
100
90
80
70
60
50
40
30
20
10
0
f = 1kHz
R = 4Ω
L
THD+N = 10%
R = 4Ω
L
R = 8Ω
L
THD+N = 1%
R = 4Ω
L
R = 8Ω
THD+N = 10%
L
2.0
1.5
1.0
0.5
0
V
= 3.3V
DD
f = 1kHz
= 300mW
P
OUT
R = 8Ω
L
f = 1kHz
R = 8Ω
L
THD+N = 1%
P
= MAX (THD+N = 1%)
OUT
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
800 1000 1200 1400 1600 1800 2000
SYNC FREQUENCY (kHz)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
OUTPUT POWER vs. LOAD RESISTANCE
0
0
2000
1600
1200
800
400
0
f = 1kHz
THD+N = 1%
INPUT REFERRED
OUTPUT REFERRED
INPUTS AC GROUNDED
-10
-20
-30
-40
-50
-60
-70
-80
-10
-20
-30
-40
-50
-60
-70
-80
V
= 200mV
IN
P-P
V
= 3.3V
DD
V
= 5V
DD
V
= 3.3V
DD
-90
-90
-100
-100
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
10k
100k
0
10 20 30 40 50 60 70 80 90 100
FREQUENCY (Hz)
LOAD RESISTANCE (Ω)
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