Datasheet
MAX9722A/MAX9722B
5V, Differential Input, DirectDrive, 130mW
Stereo Headphone Amplifiers with Shutdown
_______________________________________________________________________________________ 5
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9722 toc13
OUTPUT POWER (mW)
THD+N (%)
605040302010
0.001
0.01
0.1
1
10
100
0.0001
070
f = 10kHz
f = 20Hz
f = 1kHz
V
DD
= 5V
A
V
= -1V/V
R
L
= 16Ω
DIFFERENTIAL
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. COMMON-MODE VOLTAGE
MAX9722 toc14
COMMON-MODE VOLTAGE (V)
THD+N (%)
0.30.1-0.1-0.3
0.001
0.01
0.1
1
10
100
0.0001
-0.5 0.5
R
L
= 16Ω
R
L
= 32Ω
V
DD
= 5V
A
V
= -1V/V
f = 1kHz
DIFFERENTIAL
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9722 toc15
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
3.43.23.02.82.6
10
20
30
40
50
60
70
80
90
100
0
2.4 3.6
THD+N = 10%
THD+N = 1%
f = 1kHz
R
L
= 16Ω
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9722 toc16
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
4.43.93.42.9
20
40
60
80
100
120
140
160
180
200
0
2.4 4.9
THD+N = 10%
THD+N = 1%
f = 1kHz
R
L
= 32Ω
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9722 toc17
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
100
10
20
30
40
50
60
70
80
90
100
0
10 1000
THD+N = 10%
THD+N = 1%
V
DD
= 3V
f = 1kHz
A
V = -1V/V
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9722 toc18
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
100
20
40
60
80
100
120
140
160
180
200
0
10 1000
V
DD
= 5V
f = 1kHz
A
V
= -1V/V
THD+N = 1%
THD+N = 10%
POWER DISSIPATION
vs. OUTPUT POWER
MAX9722 toc19
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
605040302010
50
100
150
200
250
300
0
070
V
DD
= 3V
f = 1kHz
P
OUT
= P
L
+ P
R
R
L
= 16Ω
R
L
= 32Ω
POWER DISSIPATION
vs. OUTPUT POWER
MAX9722 toc20
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
80604020
100
200
300
400
500
600
0
0100
V
DD
= 5V
f = 1kHz
P
OUT
= P
L
+ P
R
R
L
= 16Ω
R
L
= 32Ω
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9722 toc21
FREQUENCY (Hz)
PSRR (dB)
10k1k100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-100
10 100k
V
DD
= 3V
A
V
= -1V/V
R
L
= 32Ω
RIGHT
LEFT
Typical Operating Characteristics (continued)
(MAX9722A, PV
DD
= SV
DD
= +5V, PGND = SGND = 0V, SHDN = SV
DD
, C1 = C2 = 1µF, R
L
= ∞, gain = -1V/V, single-ended input,
THD+N measurement bandwidth = 22Hz to 22kHz, T
A
= +25°C, unless otherwise noted.)