MAX9726 Maxim Integrated Products, MAX9726 Datasheet - Page 8

• Manufacturer Part Number: MAX9726
• Description: Headphone Amplifier
• Manufacturer: Maxim Integrated Products

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