Datasheet

(V
DD
= SHDN = 3V, PGND = SGND = 0V, C1 = C2 = 1μF, BB_ = 0V, gain = 0dB, maximum volume, BassMax disabled. Load connected
between OUT_ and SGND where specied. Outputs in phase, both channels loaded. T
A
= +25°C, unless otherwise noted.) (See Func-
tional Diagram/Typical Operating Circuit)
OUTPUT POWER vs. CHARGE-PUMP
CAPACITANCE AND LOAD RESISTANCE
MAX9723 toc22
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
403020
40
45
50
55
60
65
70
75
35
10 50
C1 = C2 = 2.2µF
C1 = C2 = 0.68µF
C1 = C2 = 1µF
V
DD
= 3V
f
IN
= 1kHz
THD+N = 1%
POWER-UP/POWER-DOWN
WAVEFORM
MAX9723 toc23
20ms/div
V
DD
2V/div
V
OUT
10mV/div
EXITING SHUTDOWN
MAX9723 toc24
40µs/div
V
OUT_
200mV/div
V
SHDN
2V/div
ENTERING SHUTDOWN
MAX9723 toc25
20µs/div
V
OUT_
200mV/div
V
SHDN
2V/div
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9723 toc26
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
3.43.23.02.82.62.42.22.0
2.5
3.0
3.5
4.0
4.5
2.0
1.8 3.6
NO LOAD
INPUTS GROUNDED
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
SHUTDOWN CURRENT (µA)
1
2
3
4
5
6
7
8
0
MAX9723 toc27
SUPPLY VOLTAGE (V)
3.43.23.02.82.62.42.22.01.8 3.6
NO LOAD
INPUTS GROUNDED
MAX9723 Stereo DirectDrive Headphone Amplier
with BassMax, Volume Control, and I
2
C
Maxim Integrated │ 8
www.maximintegrated.com
Typical Operating Characteristics (continued)