MAX9723
Stereo DirectDrive Headphone Amplifier
with BassMax, Volume Control, and I2C
6
_______________________________________________________________________________________
0
100
50
200
150
250
300
040
60
20
80
100
120
POWER DISSIPATION
vs. OUTPUT POWER
MAX9723
toc10
OUTPUT POWER (mW)
POWER
DISSIPATION
(mW)
RL = 16
Ω
VDD = 3V
fIN = 1kHz
POUT = POUTL + POUTR
OUTPUTS IN PHASE
RL = 32
Ω
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9723
toc11
LOAD RESISTANCE (
Ω)
OUTPUT
POWER
(mW)
100
10
20
30
40
50
60
70
80
0
10
1k
VDD = 2.4V
fIN = 1kHz
THD+N = 10%
THD+N = 1%
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9723
toc12
LOAD RESISTANCE (
Ω)
OUTPUT
POWER
(mW)
100
10
20
30
40
50
60
70
80
90
100
0
10
1k
VDD = 3V
fIN = 1kHz
THD+N = 10%
THD+N = 1%
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9723
toc13
SUPPLY VOLTAGE (V)
OUTPUT
POWER
(mW)
3.4
3.2
2.8 3.0
2.2 2.4 2.6
2.0
10
20
30
40
50
60
70
80
90
100
0
1.8
3.6
THD+N = 10%
THD+N = 1%
fIN = 1kHz
RL = 16
Ω
20
40
60
80
100
120
140
0
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9723
toc14
SUPPLY VOLTAGE (V)
OUTPUT
POWER
(mW)
3.4
3.2
2.8 3.0
2.2 2.4 2.6
2.0
1.8
3.6
THD+N = 10%
THD+N = 1%
fIN = 1kHz
RL = 32
Ω
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9723
toc15
FREQUENCY (Hz)
PSRR
(dB)
10k
1k
100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-100
10
100k
RL = 32
Ω
Typical Operating Characteristics (continued)
(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)