MAX9723
Stereo DirectDrive Headphone Amplifier
with BassMax, Volume Control, and I2C
_______________________________________________________________________________________
5
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9723
toc01
FREQUENCY (Hz)
THD+N
(%)
10k
1k
100
0.01
0.1
1
0.001
10
100k
VDD = 2.4V
RL = 16
Ω
POUT = 10mW
POUT = 25mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9723
toc02
FREQUENCY (Hz)
THD+N
(%)
10k
1k
100
0.01
0.1
1
0.001
10
100k
VDD = 2.4V
RL = 32
Ω
POUT = 23mW
POUT = 10mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9723
toc03
FREQUENCY (Hz)
THD+N
(%)
10k
1k
100
0.01
0.1
1
0.001
10
100k
VDD = 3V
RL = 16
Ω
POUT = 37mW
POUT = 20mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9723
toc04
FREQUENCY (Hz)
THD+N
(%)
10k
1k
100
0.01
0.1
1
0.001
10
100k
VDD = 3V
RL = 32
Ω
POUT = 30mW
POUT = 10mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9723
toc05
OUTPUT POWER (mW)
THD+N
(%)
40
20
0.01
0.1
1
10
100
0.001
060
VDD = 2.4V
RL = 16
Ω
fIN = 1kHz
fIN = 20Hz
fIN = 10kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9723
toc06
OUTPUT POWER (mW)
THD+N
(%)
40
20
0.01
0.1
1
10
100
0.001
060
VDD = 2.4V
RL = 32
Ω
fIN = 1kHz
fIN = 10kHz
fIN = 20Hz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9723
toc07
OUTPUT POWER (mW)
THD+N
(%)
80
60
40
20
0.01
0.1
1
10
100
0.001
0
100
VDD = 3V
RL = 16
Ω
fIN = 10kHz
fIN = 1kHz
fIN = 20Hz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9723
toc08
OUTPUT POWER (mW)
THD+N
(%)
80
60
40
20
0.01
0.1
1
10
100
0.001
0100
VDD = 3V
RL = 32
Ω
fIN = 10kHz
fIN = 1kHz
fIN = 20Hz
0
40
60
80
100
120
140
160
180
0
20406080
POWER DISSIPATION
vs. OUTPUT POWER
MAX9723
toc09
OUTPUT POWER (mW)
POWER
DISSIPATION
(mW)
20
VDD = 2.4V
fIN = 1kHz
POUT = POUTL + POUTR
OUTPUTS IN PHASE
RL = 32
Ω
RL = 16
Ω
Typical Operating Characteristics
(VDD = SHDN = 3V, PGND = SGND = 0V, C1 = C2 = 1F, BB_ = 0V, gain = 0dB, maximum volume, BassMax disabled. Load con-
nected between OUT_ and SGND where specified. Outputs in phase, both channels loaded. TA = +25°C, unless otherwise noted.)
(See Functional Diagram/Typical Operating Circuit)