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MAX9726
DirectDrive, Headphone Amplifier with
BassMax, I2C, Volume and Gain Control
8
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OUTPUT POWER vs. CHARGE-PUMP
CAPACITANCE AND LOAD RESISTANCE
MAX9726
toc22
LOAD RESISTANCE (
Ω)
OUTPUT
POWER
(mW)
45
40
35
30
25
20
15
65
70
75
80
85
90
60
10
50
VDD = 3.3V
fIN = 1kHz
THD+N = 1%
C1 = C2 = 2.2
μF
C1 = C2 = 1
μF
C1 = C2 = 0.68
μF
POWER-UP/POWER-DOWN
MAX9726 toc23
20ms/div
VDD
2V/div
VOUT_
10mV/div
RL = 32
Ω
EXITING SHUTDOWN
MAX9726 toc24
100
μs/div
VSHDN
5V/div
VIN_
200mV/div
VOUT_
2V/div
ENTERING SHUTDOWN
MAX9726 toc25
20
μs/div
VSHDN
5V/div
VIN_
200mV/div
VOUT_
2V/div
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9726
toc26
SUPPLY VOLTAGE (V)
SUPPLY
CURRENT
(mA)
6
5
3
4
4.9
5.0
5.1
5.2
5.3
5.4
5.5
5.6
4.8
2
NO LOAD
INPUTS AC GROUNDED
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
MAX9726
toc27
SUPPLY VOLTAGE (V)
SHUTDOWN
CURRENT
(μ
A)
5
4
3
5
6
7
8
9
10
4
26
NO LOAD
INPUTS AC GROUNDED
Typical Operating Characteristics (continued)
(VDD = SHDN = 5V, PGND = SGND = 0V, C1 = C2 = 1F, CPREG = CNREG = 1F, BM_ = 0V, RIN = 10kΩ, RF = 10kΩ, maximum vol-
ume (overall gain = 0dB), BassMax disabled. Load connected between OUT_ and PGND where specified. Outputs in phase, both
channels loaded. TA = +25°C, unless otherwise noted.) (See the Functional Diagram/Typical Operating Circuit)