Owner's manual

MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
_______________________________________________________________________________________ 7
OUTPUT POWER vs. LOAD RESISTANCE
(MAX9792 SPEAKER MODE)
MAX9791 toc07
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
10
1.0
2.0
3.0
4.0
5.0
0
1.5
2.5
3.5
4.5
0.5
1 100
f = 1kHz
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. LOAD RESISTANCE
(MAX9791 SPEAKER MODE)
MAX9791 toc08
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
10
1.0
2.0
3.0
0
1.5
2.5
0.5
1 100
f = 1kHz
THD+N = 10%
THD+N = 1%
EFFICIENCY vs. OUTPUT POWER
(MAX9792 SPEAKER MODE)
MAX9791 toc09
OUTPUT POWER (W)
EFFICIENCY (%)
1.0 2.0 3.0
70
80
90
100
110
20
10
30
40
50
60
0
0 4.00.5 1.5 2.5 3.5
R
L
= 8Ω
R
L
= 3Ω
f
IN
= 1kHz
EFFICIENCY vs. OUTPUT POWER
(MAX9791 SPEAKER MODE)
MAX9791 toc10
OUTPUT POWER (W)
EFFICIENCY (%)
1.50.90.6
70
80
90
100
20
10
30
40
50
60
0
0 1.81.20.3
R
L
= 8Ω
R
L
= 4Ω
f
IN
= 1kHz
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (SPEAKER MODE)
MAX9791 toc11
FREQUENCY (kHz)
PSRR (dB)
1
-30
-20
-10
-80
-90
-70
-60
-50
-40
-100
0.01 100
LEFT
RIGHT
0.1 10
0
V
RIPPLE
= 200mV
P-P
R
L
= 8Ω
CROSSTALK vs. FREQUENCY
(SPEAKER MODE)
MAX9791 toc12
FREQUENCY (kHz)
CROSSTALK (dB)
1
-30
-20
-10
-80
-90
-100
-70
-60
-50
-40
-110
0.01 100
RIGHT TO LEFT
LEFT TO RIGHT
0.1 10
0
FS = 1V
RMS
V
IN
= -20dBFS
R
L
= 8Ω
Typical Operating Characteristics (continued)
(V
AVDD
= V
PVDD
= V
HPVDD
= 5V, V
GND
= V
PGND
= V
CPGND
= 0, I
LDO_OUT
= 0, C
LDO
= 2 x 1µF, C1 = C2 = 1µF. R
L
= ∞, unless oth-
erwise specified. R
IN1
= 20kΩ (A
VSPKR
= 12dB), R
IN2
= 40.2kΩ (A
VHP
= 0dB), C
IN1
= 470nF, C
IN2
= C
COM
= 1µF, measurement BW
= 20kHz AES17, T
A
= +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, HP_EN = 0. Headphone mode: SPKR_EN = 1,
HP_EN = 1.)
SPEAKER