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ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Audio amplifier Headphones (2-channel, stereo) Class AB TQFN 12 (3x3)
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MAX9724C/MAX9724D
Low RF Susceptibility DirectDrive Stereo Head-
phone Amplifier with 1.8V Compatible Shutdown
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
DD
= 5V, PGND = SGND = 0V, SHDN = V
DD
, C1 = C2 = 1µF, R
L
= ∞, gain = -1.5V/V (R
IN
= 20kΩ, R
F
= 30kΩ for the MAX9724C),
THD+N measurement bandwidth = 22Hz to 22kHz, both outputs driven in phase, T
A
= +25°C, unless otherwise noted.)
0
30
20
10
40
50
60
70
80
90
100
2.5 3.53.0 4.0 4.5 5.0 5.5
OUTPUT POWER
vs. SUPPLY VOLTAGE (TQFN)
MAX9724 toc19
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
f
IN
= 1kHz
R
L
= 32Ω
1% THD+N
10% THD+N
0
30
20
10
40
50
60
70
80
90
100
2.5 3.53.0 4.0 4.5 5.0 5.5
OUTPUT POWER
vs. SUPPLY VOLTAGE (UCSP)
MAX9724 toc20
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
f
IN
= 1kHz
R
L
= 32Ω
1% THD+N
10% THD+N
35
0
10 100 1000
OUTPUT POWER
vs. LOAD RESISTANCE (TQFN)
5
MAX9724 toc21
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
15
10
20
25
30
V
DD
= 3V
f
IN
= 1kHz
1% THD+N
10% THD+N
35
0
10 100 1000
OUTPUT POWER
vs. LOAD RESISTANCE (UCSP)
5
MAX9724 toc22
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
15
10
20
25
30
V
DD
= 3V
f
IN
= 1kHz
THD+N = 1%
THD+N = 10%
0
50
150
100
200
250
POWER DISSIPATION
vs. OUTPUT POWER (TQFN)
MAX9724t oc25
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
04020 60 80
V
DD
= 3V
f
IN
= 1kHz
P
OUT
= P
OUTL
+ P
OUTR
OUTPUTS IN PHASE
R
L
= 16Ω
R
L
= 32Ω
0
20
100
80
60
40
120
140
160
POWER DISSIPATION
vs. OUTPUT POWER (UCSP)
MAX9724t oc26
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
010152025305404535 50
V
DD
= 3V
f
IN
= 1kHz
P
OUT
= P
OUTL
+ P
OUTR
OUTPUTS IN PHASE
R
L
= 16Ω
R
L
= 32Ω
0
-120
10 100 10k 100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
-100
-80
-40
-60
-20
MAX9724 toc27
FREQUENCY (Hz)
PSRR (dB)
1k
V
DD
= 5V
V
DD
= 3V
R
L
= 32Ω