Datasheet
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.)
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
(MAX9792 SPEAKER MODE)
MAX9791 toc07a
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
10
0.5
1.0
1.5
2.0
2.5
0
1100
V
PVDD
= V
AVDD
= 3.7V
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%
OUTPUT POWER vs. LOAD RESISTANCE
(MAX9791 SPEAKER MODE)
MAX9791 toc08a
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
10
0.25
0.50
0.75
1.00
1.25
1.50
0
1 100
V
PVDD
= V
AVDD
= 3.7V
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
04.00.5 1.5 2.5 3.5
R
L
= 8
Ω
R
L
= 3
Ω
f
IN
= 1kHz
EFFICIENCY vs. OUTPUT POWER
(MAX9792 SPEAKER MODE)
MAX9791 toc09a
OUTPUT POWER (W)
EFFICIENCY (%)
1.20.90.60.3
10
20
30
40
50
60
70
80
90
0
01.5
V
PVDD
= V
AVDD
= 3.7V
f
IN
= 1kHz
R
L
= 8
Ω
R
L
= 3
Ω
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
01.81.20.3
R
L
= 8
Ω
R
L
= 4
Ω
f
IN
= 1kHz
EFFICIENCY vs. OUTPUT POWER
(MAX9791 SPEAKER MODE)
MAX9791 toc10a
OUTPUT POWER (W)
EFFICIENCY (%)
0.80.60.40.2
10
20
30
40
50
60
70
80
90
0
01.0
V
PVDD
= V
AVDD
= 3.7V
f
IN
= 1kHz
R
L
= 8
Ω
R
L
= 4
Ω
SPEAKER