Datasheet

MAX9791/MAX9792
HEADPHONE OUTPUT POWER
vs. HPVDD
MAX9791 toc29
HPVDD (V)
HEADPHONE OUTPUT POWER (mW)
5.04.54.03.53.0
50
100
150
200
250
0
2.5 5.5
THD+N = 1%
f = 1kHz
R
L
= 32
Ω
R
L
= 16
Ω
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
______________________________________________________________________________________ 11
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
MAX9791 toc26
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
100
50
70
90
0
60
80
10
30
20
40
10 1000
V
HPVDD
= 3V
f = 1kHz
THD+N = 10%
THD+N = 1%
POWER DISSIPATION vs. OUTPUT POWER
(HEADPHONE MODE)
MAX9791 toc27
PER CHANNEL OUTPUT POWER (mW)
POWER DISSIPATION PER CHANNEL (mW)
50 100 150
200
250
300
50
100
150
350
400
0
0 20025 75 125 175
R
L
= 32
Ω
R
L
= 16
Ω
POWER DISSIPATION vs. OUTPUT POWER
(HEADPHONE MODE)
MAX9791 toc28
PER CHANNEL OUTPUT POWER (mW)
POWER DISSIPATION PER CHANNEL (mW)
20
100
150
200
50
250
300
0
01008040 60
R
L
= 32
Ω
V
HPVDD
= 3V
R
L
= 16
Ω
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (HEADPHONE MODE)
MAX9791 toc30
FREQUENCY (kHz)
PSRR (dB)
0.1 1 10
-90
-80
-110
-100
-50
-40
-30
-70
-60
-20
-10
0
-120
0.01 100
V
RIPPLE
= 200mV
P-P
R
L
= 32
Ω
LEFT
RIGHT
CROSSTALK vs. FREQUENCY
(HEADPHONE MODE)
MAX9791 toc31
FREQUENCY (kHz)
CROSSTALK (dB)
0.1 1 10
-90
-80
-50
-40
-30
-70
-60
-20
-100
0.01 100
RIGHT TO LEFT
COM AND SENSE
DISABLED
RIGHT TO LEFT
COM AND SENSE
DISABLED
LEFT TO RIGHT
COM AND SENSE
R
L
= 32
Ω
FS = 300mV
RMS
V
IN
= -20dBFS
RIGHT TO LEFT
COM AND SENSE
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.)
HEADPHONE