User guide

MAX9750/MAX9751/MAX9755
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
_______________________________________________________________________________________ 9
OUTPUT POWER vs. SUPPLY VOLTAGE
(HEADPHONE MODE)
MAX9750/51 toc28
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
5.04.54.03.5
25
50
75
100
125
0
3.0 5.5
R
L
= 16Ω
R
L
= 32Ω
f = 1kHz
10 1k 10k100 100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (HEADPHONE MODE)
MAX9750/51 toc29
FREQUENCY (Hz)
PSRR (dB)
V
RIPPLE
= 200mV
P-P
A
V
= 10.5dB
OUTPUT REFERRED
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-100
10 100 1k 10k 100k
CROSSTALK vs. FREQUENCY
(HEADPHONE MODE)
MAX9750/51 toc30
FREQUENCY (Hz)
CROSSTALK (dB)
V
CC
= 5V
V
RIPPLE
= 200mV
P-P
R
L
= 32Ω
LEFT TO RIGHT
RIGHT TO LEFT
-100
-80
-60
-40
-20
0
-120
OUTPUT POWER vs. CHARGE-PUMP
CAPACITANCE AND LOAD RESISTANCE
MAX9750/51 toc31
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
403020
20
40
60
80
100
120
140
160
180
200
0
10 50
V
DD
= 5V
f = 1kHz
THD+N = 1%
C1 = C2 = 2.2µF
C1 = C2 = 1µF
Typical Operating Characteristics (continued)
(Measurement BW = 22Hz to 22kHz, T
A
= +25°C, unless otherwise noted.)
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
MAX9750/51 toc26
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
100
20
40
60
80
100
120
140
160
180
0
10 1000
THD+N = 10%
THD+N = 1%
(HEADPHONE MODE)
MAX9750/51 toc27
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
225200150 17550 75 100 12525
25
50
75
100
125
150
175
200
225
250
0
0250
V
DD
= 5V
f = 1kHz
P
OUT
= P
OUTL
+ P
OUTR
R
L
= 16Ω
R
L
= 32Ω
1000
100
10
0.1
1
0.01
0.001
070
80
20 30
40
50
60
10
90
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9750/51 toc25
OUTPUT POWER (mW)
THD+N (%)
V
DD
= 3.3V
R
L
= 32Ω
A
V
= 3dB
f
IN
= 10kHz
f
IN
= 1kHz
f
IN
= 20Hz