Datasheet

MAX9728A/MAX9728B
60mW, DirectDrive, Stereo Headphone
Amplifiers with Shutdown
4 _______________________________________________________________________________________
100
020 6040 80 100
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9728A/28B toc01
OUTPUT POWER (mW)
THD+N (%)
V
DD
= 5V
R
L
= 16Ω
f
IN
= 1kHz
f
IN
= 20Hz
f
IN
= 10kHz
100
020 6040 80 120
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9728A/28B toc02
OUTPUT POWER (mW)
THD+N (%)
100
V
DD
= 5V
R
L
= 32Ω
f
IN
= 1kHz
f
IN
= 20Hz
f
IN
= 10kHz
10 1k100 10k 100k
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9728A/28B toc03
FREQUENCY (Hz)
THD+N (%)
1
0.1
0.001
0.01
V
DD
= 5V
R
L
= 16Ω
P
OUT
= 20mW
P
OUT
= 37mW
10 1k100 10k 100k
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9728A/28B toc04
FREQUENCY (Hz)
THD+N (%)
1
0.1
0.001
0.01
V
DD
= 5V
R
L
= 32Ω
P
OUT
= 50mW
P
OUT
= 30mW
0
20
10
40
30
60
50
70
4.5 5.0 5.5
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9728A/28B toc05
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
f
IN
= 1kHz
R
L
= 16Ω
THD+N = 1%
THD+N = 10%
0
40
20
80
60
100
120
4.5 5.0 5.5
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9728A/28B toc06
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
f
IN
= 1kHz
R
L
= 32Ω
THD+N = 1%
THD+N = 10%
Typical Operating Characteristics
(V
DD
= 5V, PGND = SGND = 0V, SHDN = V
DD
, C1 = C2 = 1µF, R
L
= ∞, gain = -1.5V/V (R
IN
= 20kΩ, R
F
= 30kΩ for the MAX9728A),
THD+N measurement bandwidth = 22Hz to 22kHz, both outputs driven in phase, T
A
= +25°C, unless otherwise noted.)