![](http://datasheet.mmic.net.cn/Maxim-Integrated-Products/MAX9726AETP-T_datasheet_105779/MAX9726AETP-T_5.png)
MAX9726
DirectDrive, Headphone Amplifier with
BassMax, I2C, Volume and Gain Control
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
OUTPUT POWER (mW)
THD+N
(%)
MAX9726
toc01
0
20
40
60
80
100 120 140 160
0.001
0.01
0.1
1
10
100
fIN = 10kHz
fIN = 1kHz
VDD = 3.3V
RL = 16
Ω
fIN = 20Hz
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
OUTPUT POWER (mW)
THD+N
(%)
MAX9726
toc02
0
20406080
100 120 140 160
0.001
0.01
0.1
1
10
100
fIN = 10kHz
fIN = 1kHz
VDD = 3.3V
RL = 32
Ω
fIN = 20Hz
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
OUTPUT POWER (mW)
THD+N
(%)
MAX9726
toc03
0
20 40 60 80 100 120 140 160 180 200
0.001
0.01
0.1
1
10
100
VDD = 5V
RL = 16
Ω
fIN = 1kHz
fIN = 10kHz
fIN = 20Hz
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
OUTPUT POWER (mW)
THD+N
(%)
MAX9726
toc04
0
20
40
60
80
100 120 140 160
0.001
0.01
0.1
1
10
100
VDD = 5V
RL = 32Ω
fIN = 1kHz
fIN = 10kHz
fIN = 20Hz
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
FREQUENCY (Hz)
THD+N
(%)
MAX9726
toc05
10
100
1k
10k
100k
0.001
0.01
0.1
1
10
VDD = 3.3V
RL = 16Ω
OUTPUT POWER = 60mW
OUTPUT POWER = 20mW
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
FREQUENCY (Hz)
THD+N
(%)
MAX9726
toc06
10
100
1k
10k
100k
0.001
0.01
0.1
1
10
VDD = 3.3V
RL = 32
Ω
OUTPUT POWER = 60mW
OUTPUT POWER = 20mW
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
FREQUENCY (Hz)
THD+N
(%)
MAX9726
toc07
10
100
1k
10k
100k
0.001
0.01
0.1
1
10
VDD = 5V
RL = 16
Ω
OUTPUT POWER = 80mW
OUTPUT POWER = 40mW
Typical Operating Characteristics
(VDD = SHDN = 5V, PGND = SGND = 0V, C1 = C2 = 1F, CPREG = CNREG = 1F, BM_ = 0V, RIN = 10kΩ, RF = 10kΩ, maximum vol-
ume (overall gain = 0dB), BassMax disabled. Load connected between OUT_ and PGND where specified. Outputs in phase, both
channels loaded. TA = +25°C, unless otherwise noted.) (See the Functional Diagram/Typical Operating Circuit)
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5