Maxim MAX9777 用户手册
MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
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7
CROSSTALK vs. FREQUENCY
(SPEAKER MODE)
MAX9777/78 toc19
FREQUENCY (Hz)
CROSSTALK (dB)
10k
1k
100
-110
-100
-90
-80
-70
-60
-50
-40
-120
10
100k
V
IN
= 200mV
P-P
R
L
= 8
Ω
RIGHT TO LEFT
LEFT TO RIGHT
ENTERING SHUTDOWN (SPEAKER MODE)
MAX9777/78 toc20
400ms/div
V
DD
2V/div
OUT_+ AND OUT_-
1V/div
OUT_+ - OUT_-
200mV/div
EXITING SHUTDOWN (SPEAKER MODE)
MAX9777/78 toc21
100ms/div
OUT_+ AND OUT_-
1V/div
OUT_+ - OUT_-
500mV/div
SHDN
2V/div
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9777/78 toc22
FREQUENCY (Hz)
THD+N (%)
10k
1k
100
0.001
0.01
0.1
1
0.0001
10
100k
R
L
= 16
Ω
A
V
= 1V/V
P
OUT
= 50mW
P
OUT
= 25mW
P
OUT
= 100mW
P
OUT
= 150mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9777/78 toc23
FREQUENCY (Hz)
THD+N (%)
10k
1k
100
0.001
0.01
0.1
1
0.0001
10
100k
R
L
= 16
Ω
A
V
= 2V/V
P
OUT
= 50mW
P
OUT
= 25mW
P
OUT
= 100mW
P
OUT
= 150mW
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.)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (SPEAKER MODE)
MAX9777/78 toc18
FREQUENCY (Hz)
PSRR (dB)
10k
1k
100
90
80
70
60
50
40
100
10
100k
V
RIPPLE
= 200mV
P-P