Datasheet
MAX9725
1V, Low-Power, DirectDrive, Stereo Headphone
Amplifier with Shutdown
_______________________________________________________________________________________
5
Typical Operating Characteristics (continued)
(V
DD
= 1.5V, V
PGND
= V
SGND
= 0V, V
SHDN
= 1.5V, V
SS
= V
PVSS,
C1 = C2 = 1µF, C
IN
= 1µF, THD+N measurement bandwidth = 22Hz
to 22kHz, T
A
= +25°C, unless otherwise noted.) (See the
Functional Diagrams.
)
100
0 5 10 15
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9725 toc07
OUTPUT POWER (mW)
THD+N (%)
V
DD
= 1V
R
L
= 16Ω
A
V
= -2V/V
f
IN
= 20Hz
f
IN
= 1kHz
f
IN
= 10kHz
100
0 5 10 15
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9725 toc08
OUTPUT POWER (mW)
THD+N (%)
V
DD
= 1V
R
L
= 32Ω
A
V
= -2V/V
f
IN
= 20Hz
f
IN
= 1kHz
f
IN
= 10kHz
10 100 10k1k 100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9725 toc09
FREQUENCY (Hz)
PSRR (dB)
-10
-110
-60
-50
-40
-30
-20
-70
-80
-90
-100
V
DD
= 1.5V
R
L
= 32Ω
10 100 10k1k 100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9725 toc10
FREQUENCY (Hz)
PSRR (dB)
0
-100
-50
-40
-30
-20
-10
-60
-70
-80
-90
V
DD
= 1V
R
L
= 32Ω
10 100 10k1k 100k
CROSSTALK vs. FREQUENCY
MAX9725 toc11
FREQUENCY (Hz)
PSRR (dB)
0
-20
-40
-60
-80
-100
-120
V
DD
= 1.5V
P
OUT
= 5mW
R
L
= 32Ω
RIGHT TO LEFT
LEFT TO RIGHT
0
10
20
30
40
50
60
70
80
0.9 1.1 1.3 1.5
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9725 toc12
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
f
IN
= 1kHz
R
L
= 16Ω
BOTH INPUTS
DRIVEN IN-PHASE
THD+N = 10%
THD+N = 1%
10 10k1k100 100k
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9725 toc04
FREQUENCY (Hz)
THD+N (%)
1
0.1
0.001
0.01
P
OUT
= 0.7mW
P
OUT
= 4mW
V
DD
= 1V
R
L
= 32Ω
A
V
= -2V/V
100
010203040
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9725 toc05
OUTPUT POWER (mW)
THD+N (%)
V
DD
= 1.5V
R
L
= 16Ω
A
V
= -2V/V
f
IN
= 20Hz
f
IN
= 1kHz
f
IN
= 10kHz
100
010203040
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9725 toc06
OUTPUT POWER (mW)
THD+N (%)
V
DD
= 1.5V
R
L
= 32Ω
A
V
= -2V/V
f
IN
= 20Hz
f
IN
= 1kHz
f
IN
= 10kHz