Datasheet

MAX4409
80mW, DirectDrive, Stereo Headphone
Amplifier with Common-Mode Sense
_______________________________________________________________________________________ 7
POWER DISSIPATION
vs. OUTPUT POWER
MAX4409 toc31
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
16012040 80
50
100
150
200
250
300
350
400
0
0 200
INPUTS 180°
OUT OF PHASE
f
IN
= 1kHz
R
L
= 16Ω
V
DD
= 3V
P
OUT
= P
OUTL
+ P
OUTR
INPUTS
IN PHASE
POWER DISSIPATION
vs. OUTPUT POWER
MAX4409 toc32
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
16012040 80
20
40
60
80
120
100
140
160
180
0
0 200
INPUTS 180°
OUT OF PHASE
f
IN
= 1kHz
R
L
= 32Ω
V
DD
= 3V
P
OUT
= P
OUTL
+ P
OUTR
INPUTS
IN PHASE
POWER DISSIPATION
vs. OUTPUT POWER
MAX4409 toc33
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
50403010 20
20
40
60
80
100
120
140
0
060
INPUTS 180°
OUT OF PHASE
f
IN
= 1kHz
R
L
= 16Ω
V
DD
= 1.8V
P
OUT
= P
OUTL
+ P
OUTR
INPUTS
IN PHASE
POWER DISSIPATION
vs. OUTPUT POWER
MAX4409 toc34
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
50403010 20
10
20
30
40
50
60
70
0
060
INPUTS 180°
OUT OF PHASE
f
IN
= 1kHz
R
L
= 32Ω
V
DD
= 1.8V
P
OUT
= P
OUTL
+ P
OUTR
INPUTS
IN PHASE
80
60
40
100 10k 100k 1M 10M
20
0
-20
-40
-60
-80
-100
-180
-120
-140
-160
GAIN AND PHASE vs. FREQUENCY
MAX4409 toc35
FREQUENCY (Hz)
GAIN/PHASE (dB/DEGREES)
V
DD
= 3V
A
V
= 1000V/V
R
L
= 16Ω
1k
GAIN
PHASE
10
10 1k 10k 1M100k 10M
0
-10
-20
-30
-50
-40
GAIN FLATNESS vs. FREQUENCY
MAX4410 toc36
FREQUENCY (Hz)
GAIN
(dB)
V
DD
= 3V
A
V
= -1V/V
R
L
= 16Ω
100
CHARGE-PUMP OUTPUT RESISTANCE
vs. SUPPLY VOLTAGE
MAX4409 toc37
SUPPLY VOLTAGE (V)
OUTPUT RESISTANCE (Ω)
3.33.02.72.42.1
2
4
6
8
10
0
1.8 3.6
V
IN_
= GND
I
PVSS
= 10mA
NO LOAD
OUTPUT POWER vs. CHARGE-PUMP
CAPACITANCE AND LOAD RESISTANCE
MAX4409 toc38
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
403020
20
10
30
40
50
60
70
80
90
0
10 50
f
IN
= 1kHz
THD+N = 1%
INPUTS IN PHASE
C1 = C2 = 1μF
C1 = C2 = 0.47μF
C1 = C2 = 0.68μF
C1 = C2 = 2.2μF
FREQUENCY (Hz)
10k1k
100 100k
OUTPUT SPECTRUM vs. FREQUENCY
MAX4409 toc39
OUTPUT SPECTRUM (dB)
-100
-80
-60
-40
-20
0
-120
V
IN
= 1V
P-P
f
IN
= 1kHz
R
L
= 32Ω
A
V
= -1V/V
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, R
IN
= R
F
= R1 = R2 = 10kΩ, THD+N measurement bandwidth = 22Hz to 22kHz, T
A
= +25°C, unless otherwise noted.)