Typical Operating Characteristics (continued)
(Measurement BW = 22Hz to 22kHz, T
A
= +25°C, unless otherwise noted.)
MAX9750/MAX9751/MAX9755
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
8 _______________________________________________________________________________________
10
1
0.1
0.01
0.001
0.0001
10 1k 10k100 100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9750/51 toc19
FREQUENCY (Hz)
THD+N (%)
V
DD
= 5V
R
L
= 32Ω
A
V
= 3dB
OUTPUT POWER = 45mW
OUTPUT POWER = 10mW
10
1
0.1
0.01
0.001
0.0001
10 1k 10k100 100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9750/51 toc20
FREQUENCY (Hz)
THD+N (%)
V
DD
= 3.3V
R
L
= 16Ω
A
V
= 3dB
OUTPUT POWER = 30mW
OUTPUT POWER = 10mW
10
1
0.1
0.01
0.001
0.0001
10 1k 10k100 100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9750/51 toc21
FREQUENCY (Hz)
THD+N (%)
V
DD
= 3.3V
R
L
= 32Ω
A
V
= 3dB
OUTPUT POWER = 45mW
OUTPUT POWER = 10mW
1000
100
10
1
0.1
0.01
0.001
075
100
12550
25
150
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9750/51 toc22
OUTPUT POWER (mW)
THD+N (%)
V
DD
= 5V
R
L
= 16Ω
A
V
= 3dB
f
IN
= 10kHz
f
IN
= 1kHz
f
IN
= 20Hz
1000
100
10
1
0.1
0.01
0.001
0608040
20
100
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9750/51 toc23
OUTPUT POWER (mW)
THD+N (%)
V
DD
= 5V
R
L
= 32Ω
A
V
= 3dB
f
IN
= 10kHz
f
IN
= 1kHz
f
IN
= 20Hz
1000
100
10
1
0.1
0.01
0.001
030
40
5020
10
60
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9750/51 toc24
OUTPUT POWER (mW)
THD+N (%)
V
DD
= 3.3V
R
L
= 16Ω
A
V
= 3dB
f
IN
= 10kHz
f
IN
= 1kHz
f
IN
= 20Hz
TURN-OFF RESPONSE
(SPEAKER MODE)
MAX9750/51 toc17
20ms/div
SHDN
5V/div
2V/div
20mV/div
OUT_+
AND
OUT_-
OUT_+
- OUT_-
R
L
= 8Ω
10
1
0.1
0.01
0.001
0.0001
10 1k 10k100 100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9750/51 toc18
FREQUENCY (Hz)
THD+N (%)
V
DD
= 5V
R
L
= 16Ω
A
V
= 3dB
OUTPUT POWER = 90mW
OUTPUT POWER = 30mW
