Datasheet

MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
16 ______________________________________________________________________________________
1.00ms/div
LINE-TRANSIENT RESPONSE
CH1 LOW
4.560V
CH1 HIGH
5.500V
CH2 HIGH
1.000mV
CH2 LOW
800.0
µ
V
MAX9791 toc50
100ms/div
LOAD-TRANSIENT RESPONSE
I
LDO_OUT
50mA/div
MAX9791 toc51
AC-COUPLED
V
LDO_OUT
10mV/div
200µs/div
SHUTDOWN RESPONSE
LDO_EN
2V/div
MAX9791 toc52
V
LDO_EN
2V/div
CROSSTALK vs. FREQUENCY
SPEAKER TO LDO
MAX9791 toc53
FREQUENCY (kHz)
CROSSTALK (dB)
1010.1
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-130
0.01 100
BOTH SPEAKERS WITH SIGNAL
P
SPKR
= 1.2W
R
LSPKR
= 8W
I
LDO
= 10mA
LEFT CHANNEL TO LDO
RIGHT CHANNEL TO LDO
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.)
LDO