MAX9720
50mW, DirectDrive, Stereo Headphone
Amplifier with SmartSense and Shutdown
_______________________________________________________________________________________ 7
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9720 toc28
OUTPUT POWER (mW)
THD+N (%)
40302010
0.01
0.1
1
10
100
0.001
050
OUTPUTS
IN PHASE
OUTPUTS
OUT OF
PHASE
V
DD
= 1.8V
A
V
= -1.41V/V
f = 1kHz
R
L
= 16Ω
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9720 toc29
OUTPUT POWER (mW)
THD+N (%)
40302010
0.01
0.1
1
10
100
0.001
050
OUTPUTS
IN PHASE
OUTPUTS
OUT OF
PHASE
V
DD
= 1.8V
A
V
= -1.41V/V
f = 10kHz
R
L
= 16Ω
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9720 toc30
OUTPUT POWER (mW)
THD+N (%)
25155302010
0.01
0.1
1
10
100
0.001
04035
OUTPUTS
IN PHASE
OUTPUTS
OUT OF
PHASE
V
DD
= 1.8V
A
V
= -1.41V/V
f = 20Hz
R
L
= 32Ω
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9720 toc31
OUTPUT POWER (mW)
THD+N (%)
25155302010
0.01
0.1
1
10
100
0.001
04035
OUTPUTS
IN PHASE
OUTPUTS
OUT OF
PHASE
V
DD
= 1.8V
A
V
= -1.41V/V
f = 1kHz
R
L
= 32Ω
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9720 toc32
OUTPUT POWER (mW)
THD+N (%)
25155302010
0.01
0.1
1
10
100
0.001
04035
OUTPUTS
IN PHASE
OUTPUTS
OUT OF
PHASE
V
DD
= 1.8V
A
V
= -1.41V/V
f = 10kHz
R
L
= 32Ω
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9720 toc33
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
3.33.02.72.42.1
20
40
60
80
100
120
140
160
180
200
0
1.8 3.6
f
IN
= 1kHz
R
L
= 16Ω
THD+N = 1%
STEREO
OUT OF
PHASE
STEREO
IN PHASE
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9720 toc34
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
3.33.02.72.42.1
20
40
60
80
100
120
140
160
180
200
0
1.8 3.6
f
IN
= 1kHz
R
L
= 16Ω
THD+N = 10%
STEREO
OUT OF
PHASE
STEREO
IN PHASE
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9720 toc35
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
3.33.02.72.42.1
20
40
60
80
100
120
140
160
0
1.8 3.6
f
IN
= 1kHz
R
L
= 32Ω
THD+N = 1%
STEREO
OUT OF
PHASE
STEREO
IN PHASE
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9720 toc36
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
3.33.02.72.42.1
20
40
60
80
100
120
140
160
0
1.8 3.6
f
IN
= 1kHz
R
L
= 32Ω
THD+N = 10%
STEREO
OUT OF
PHASE
STEREO
IN PHASE
Typical Operating Characteristics (continued)
(V
DD
= 3V, THD+N bandwidth = 22Hz to 22kHz, MODE1 = MODE2 = V
DD
.)