User Manual

MAX9820
DirectDrive Headphone Amplifier
with External Gain
4 _______________________________________________________________________________________
Typical Operating Characteristics
(V
DD
= V
SHDN
= 5V, V
GND
= 0V, R
IN
= R
FB
= 40.2kΩ (gain = -1V/V), C1 = C2 = 1µF, C3 = 10µF, R
LOAD
= ∞. Typical values are at T
A
= +25°C, unless otherwise noted.)
THD+N vs. OUTPUT POWER
MAX9820 toc01
OUTPUT POWER (W)
THD+N (%)
0.120.100.080.060.040.02
0.01
0.1
1
10
0.001
0 0.14
V
DD
= 5.0V
R
LOAD
= 16
I
L
LOAD
= 1
F
H
f = 100Hz
f = 1kHz
f = 6kHz
THD+N vs. OUTPUT POWER
MAX9820 toc02
OUTPUT POWER (W)
THD+N (%)
0.140.120.100.080.060.040.02
0.01
0.1
1
10
0.001
0 0.16
V
DD
= 5.0V
R
LOAD
= 32
I
L
LOAD
= 1FH
f = 100Hz
f = 1kHz
f = 6kHz
THD+N vs. OUTPUT POWER
MAX9820 toc03
OUTPUT POWER (W)
THD+N (%)
0.050.040.030.020.010 0.06
0.01
0.1
1
10
0.001
V
DD
= 3.6V
R
LOAD
= 16
I
L
LOAD
= 1
F
H
f = 100Hz
f = 1kHz
f = 6kHz
THD+N vs. OUTPUT POWER
MAX9820 toc04
OUTPUT POWER (W)
THD+N (%)
0.070.060.050.040.030.020.010 0.08
0.01
0.1
1
10
0.001
V
DD
= 3.6V
R
LOAD
= 32
I
L
LOAD
= 1
F
H
f = 100Hz
f = 1kHz
f = 6kHz
THD+N vs. FREQUENCY
MAX9820 toc05
FREQUENCY (Hz)
10,000100010010 100,000
THD+N (%)
0.01
0.1
1
10
0.001
V
DD
= 5.0V
R
LOAD
= 16
I
L
LOAD
= 1
F
H
P
OUT
= 60mW
P
OUT
= 20mW
THD+N vs. FREQUENCY
MAX9820 toc06
FREQUENCY (Hz)
10,000100010010 100,000
THD+N (%)
0.01
0.1
1
10
0.001
V
DD
= 5.0V
R
LOAD
= 32
I
L
LOAD
= 1
F
H
P
OUT
= 60mW
P
OUT
= 20mW