Maxim MAX9777, Manual

Page: 8 / 27

MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
8
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TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9777/78 toc28
OUTPUT POWER (mW)
THD+N (%)
100 75 50 25
0.01
0.001
10
1
0.1
100
0.0001
0 125
A
V
= 1V/V
R
L
= 32
Ω
f = 20Hz
f = 1kHz
f = 10 kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9777/78 toc29
OUTPUT POWER (mW)
THD+N (%)
100 75 50 25
0.01
0.001
10
1
0.1
100
0.0001
0 125
A
V
= 2V/V
R
L
= 32
Ω
f = 20Hz
f = 1kHz
f = 10 kHz
OUTPUT POWER vs. AMBIENT TEMPERATURE
(HEADPHONE MODE)
MAX9777/78 toc30
AMBIENT TEMPERATURE (
°
C)
OUTPUT POWER (mW)
60 35 10 -15
50
100
200
150
250
300
0
-40 85
THD+N = 10%
THD+N = 1%
f = 1kHz
R
L
= 16
Ω
OUTPUT POWER vs. AMBIENT TEMPERATURE
(HEADPHONE MODE)
MAX9777/78 toc331
AMBIENT TEMPERATURE (
°
C)
OUTPUT POWER (mW)
60 35 10 -15
25
50
100
75
125
150
0
-40 85
THD+N = 10%
THD+N = 1%
f = 1kHz
R
L
= 32
Ω
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
MAX9777/78 toc32
LOAD RESISTANCE (
Ω
)
OUTPUT POWER (mW)
1k 100 10
100
200
300
400
500
600
0
1 10k
f = 1kHz
THD+N = 10%
THD+N = 1%
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.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9777/78 toc25
FREQUENCY (Hz)
THD+N (%)
10k 1k 100
0.001
0.01
0.1
1
0.0001
10 100k
R
L
= 32
Ω
A
V
= 2V/V
P
OUT
= 50mW
P
OUT
= 25mW
P
OUT
= 100mW
P
OUT
= 150mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9777/78 toc26
OUTPUT POWER (mW)
THD+N (%)
250 200 150 100 50
0.01
0.001
10
1
0.1
100
0.0001
0 300
A
V
= 1V/V
R
L
= 16
Ω
f = 20Hz
f = 1kHz
f = 10 kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9777/78 toc27
OUTPUT POWER (mW)
THD+N (%)
250 200 150 100 50
0.01
0.001
10
1
0.1
100
0.0001
0 300
A
V
= 2V/V
R
L
= 16
Ω
f = 20Hz
f = 1kHz
f = 10 kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9777/78 toc24
FREQUENCY (Hz)
THD+N (%)
10k 1k 100
0.001
0.01
0.1
1
0.0001
10 100k
R
L
= 32
Ω
A
V
= 1V/V
P
OUT
= 50mW
P
OUT
= 25mW
P
OUT
= 100mW
P
OUT
= 150mW