Maxim Integrated MAX9778 - Manual (Page 9)

MAX9777/MAX9778
Stereo 3W Audio Power Amplifiers with
Headphone Drive and Input Mux
_______________________________________________________________________________________ 9
EXITING SHUTDOWN (HEADPHONE MODE)
MAX9777/78 toc37
100ms/div
OUT_+
1V/div
HP JACK
200mV/div
SHDN
2V/div
R L = 16 Ω
INPUT AC-COUPLED TO GND
ENTERING SHUTDOWN (HEADPHONE MODE)
MAX9777/78 toc38
100ms/div
OUT_+
1V/div
HP JACK
100mV/div
SHDN
2V/div
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(SPEAKER MODE)
MAX9777/78 toc39
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.25 5.00 4.75
5
10
15
20
25
0
4.50 5.50
T
A
= +85 °C
T A = +25 °C
T
A
= -40 °C
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 (HEADPHONE MODE)
MAX9777/78 toc35
FREQUENCY (Hz)
PSRR (dB)
10k 1k 100
90
80
70
60
50
40
100
10 100k
V RIPPLE = 200mV P-P
CROSSTALK vs. FREQUENCY
(HEADPHONE MODE)
MAX9777/78 toc36
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 = 16 Ω
RIGHT TO LEFT
LEFT TO RIGHT
POWER DISSIPATION vs. OUTPUT POWER
(HEADPHONE MODE)
MAX9777/78 toc33
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
50 100 150 200
20
40
60
80
100
120
0
0
R L = 16 Ω
f = 1kHz
POWER DISSIPATION vs. OUTPUT POWER
(HEADPHONE MODE)
MAX9777/78 toc34
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
100 20 40 60 80
10
20
30
40
50
60
70
0
0
R L = 32 Ω
f = 1kHz