Typical Operating Characteristics (continued)
(VAVDD = VPVDD = VHPVDD = 5V, VGND = VPGND = VCPGND = 0, ILDO_OUT = 0, CLDO = 2 x 1F, C1 = C2 = 1F. RL = ∞, unless oth-
erwise specified. RIN1 = 20k (AVSPKR = 12dB), RIN2 = 40.2k (AVHP = 0dB), CIN1 = 470nF, CIN2 = CCOM = 1F, measurement BW
= 20kHz AES17, TA = +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 (
)
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 (
)
OUTPUT
POWER
(W)
10
0.5
1.0
1.5
2.0
2.5
0
1100
VPVDD = VAVDD = 3.7V
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. LOAD RESISTANCE
(MAX9791 SPEAKER MODE)
MAX9791
toc08
LOAD RESISTANCE (
)
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 (
)
OUTPUT
POWER
(W)
10
0.25
0.50
0.75
1.00
1.25
1.50
0
1
100
VPVDD = VAVDD = 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
04.0
0.5
1.5
2.5
3.5
RL = 8
RL = 3
fIN = 1kHz
EFFICIENCY vs. OUTPUT POWER
(MAX9792 SPEAKER MODE)
MAX9791
toc09a
OUTPUT POWER (W)
EFFICIENCY
(%)
1.2
0.9
0.6
0.3
10
20
30
40
50
60
70
80
90
0
01.5
VPVDD = VAVDD = 3.7V
fIN = 1kHz
RL = 8
RL = 3
EFFICIENCY vs. OUTPUT POWER
(MAX9791 SPEAKER MODE)
MAX9791
toc10
OUTPUT POWER (W)
EFFICIENCY
(%)
1.5
0.9
0.6
70
80
90
100
20
10
30
40
50
60
0
01.8
1.2
0.3
RL = 8
RL = 4
fIN = 1kHz
EFFICIENCY vs. OUTPUT POWER
(MAX9791 SPEAKER MODE)
MAX9791
toc10a
OUTPUT POWER (W)
EFFICIENCY
(%)
0.8
0.6
0.4
0.2
10
20
30
40
50
60
70
80
90
0
01.0
VPVDD = VAVDD = 3.7V
fIN = 1kHz
RL = 8
RL = 4
SPEAKER