Maxim Integrated MAX9778 - Manual (Page 6)

MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
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TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9777/78 toc10
OUTPUT POWER (W)
THD+N (%)
2.5 3.0 2.0 1.5 1.0 0.5
0.01
10
1
0.1
100
0.001
0 3.5
A V = 4V/V
R
L
= 4 Ω
f = 20Hz
f = 1kHz
f = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9777/78 toc11
OUTPUT POWER (W)
THD+N (%)
1.5 1.0 0.5
0.01
10
1
0.1
100
0.001
0 2.0
A
V
= 2V/V
R L = 8 Ω
f = 20Hz
f = 1kHz
f = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9777/78 toc12
OUTPUT POWER (W)
THD+N (%)
1.5 1.0 0.5
0.01
10
1
0.1
100
0.001
0 2.0
A V = 4V/V
R
L
= 8 Ω
f = 20Hz
f = 1kHz
f = 10kHz
OUTPUT POWER vs. AMBIENT TEMPERATURE
(SPEAKER MODE)
MAX9777/78 toc13
AMBIENT TEMPERATURE ( °C)
OUTPUT POWER (W)
60 35 10 -15
1
2
3
4
0
-40 85
THD+N = 10%
THD+N = 1%
f = 1kHz
R
L = 3 Ω
OUTPUT POWER vs. AMBIENT TEMPERATURE
(SPEAKER MODE)
MAX9777/78 toc14
AMBIENT TEMPERATURE ( °C)
OUTPUT POWER (W)
60 35 10 -15
1
2
3
4
0
-40 85
THD+N = 10%
THD+N = 1%
f = 1kHz
R
L = 4 Ω
OUTPUT POWER vs. AMBIENT TEMPERATURE
(SPEAKER MODE)
MAX9777/78 toc15
AMBIENT TEMPERATURE ( °C)
OUTPUT POWER (W)
60 35 10 -15
0.5
1.0
1.5
2.0
0
-40 85
THD+N = 10%
THD+N = 1%
f = 1kHz
R
L = 8 Ω
OUTPUT POWER vs. LOAD RESISTANCE
(SPEAKER MODE)
MAX9777/78 toc16
LOAD RESISTANCE ( Ω)
OUTPUT POWER (W)
10k 1k 100 10
1
2
3
4
5
0
1 100k
f = 1kHz
THD+N = 10%
THD+N = 1%
POWER DISSIPATION vs. OUTPUT POWER
(SPEAKER MODE)
MAX9777/78 toc17
OUTPUT POWER (W)
POWER DISSIPATION (W)
2.5 0.5 1.0 1.5 2.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0
0
R L = 4 Ω
f = 1kHz
Typical Operating Characteristics (continued)
(V DD = PV DD = 5V, GND = PGND = 0V, V SHDN = 5V, C BIAS = 1µF, T
A
= +25°C, unless otherwise noted.)