Datasheet

MAX9728A/MAX9728B
0
-120
10 100 10k 100k
POWER-SUPPLY REJECTION
RATIO vs. FREQUENCY
-100
-80
-40
-60
-20
MAX9728A/28B toc08
FREQUENCY (Hz)
PSRR (dB)
1k
R
L
= 32Ω
V
DD
= 5V
0
-120
10 100 10k 100k
CROSSTALK vs. FREQUENCY
-100
-80
-40
-60
-20
MAX9728A/28B toc09
FREQUENCY (Hz)
CROSSTALK (dB)
1k
RIGHT TO LEFT
LEFT TO RIGHT
P
OUT
= 15mW
R
L
= 16Ω
60mW, DirectDrive, Stereo Headphone
Amplifiers with Shutdown
_______________________________________________________________________________________ 5
20
40
30
60
50
70
80
0 200 300100
50
150
250
OUTPUT POWER vs. LOAD RESISTANCE
AND CHARGE-PUMP CAPACITOR SIZE
MAX9728A/28B toc10
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
C1 = C2 = 2.2μF
C1 = C2 = 1μF
C1 = C2 = 0.47μF
V
DD
= 5V
f
IN
= 1kHz
THD+N = 1%
3.20
3.25
3.40
3.30
3.45
3.35
3.50
4.5 5.0 5.5
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9728A/28B toc11
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
NO LOAD INPUTS GROUND
0
3
1
7
5
9
2
6
4
8
10
4.5 5.0 5.5
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
MAX9728A/28B toc12
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (nA)
NO LOAD INPUTS GROUND
100
0
10 100 1000
OUTPUT POWER
vs. LOAD RESISTANCE
10
MAX9728A/28B toc07
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
30
20
50
70
90
40
60
80
V
DD
= 5V
f
IN
= 1kHz
THD+N = 10%
THD+N = 1%
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 MAX9728A),
THD+N measurement bandwidth = 22Hz to 22kHz, both outputs driven in phase, T
A
= +25°C, unless otherwise noted.)