Datasheet

MAX9744
20W Stereo Class D Speaker Amplifier
with Volume Control
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
P
OUT
= 10W, f
IN
= 1kHz,
8Ω load
93
Filterless
modulation
P
OUT
= 15W, f
IN
= 1kHz,
4Ω load
87
%
P
OUT
= 10W, f
IN
= 1kHz,
8Ω load
92
Efficiency (Note 3)
η
PWM
P
OUT
= 15W, f
IN
= 1kHz,
4Ω load
88
%
R
L
= 8Ω, THD+N = 1% 1.4
R
L
= 8Ω, THD+N = 10% 1.8
R
L
= 4Ω, THD+N = 1% 2.6
V
PVDD
= 5V,
f
IN
= 1kHz
R
L
= 4Ω, THD+N = 10% 3.6
R
L
= 8Ω, THD+N = 1% 8
R
L
= 8Ω, THD+N = 10% 10
R
L
= 4Ω, THD+N = 1% 14
V
PVDD
= 12V,
f
IN
= 1kHz
R
L
= 4Ω, THD+N = 10% 17
R
L
= 8Ω, THD+N = 1% 10
R
L
= 8Ω, THD+N = 10% 13
R
L
= 4Ω, THD+N = 1% 17.5
Output Power P
OUT
V
PVDD
= 14V,
f
IN
= 1kHz
R
L
= 4Ω, THD+N = 10% 22.5
W
Hard Output Current Limit I
SC
3.9 5.5 A
Filterless modulation 0.04
Total Harmonic Distortion Plus
Noise
THD+N
f = 1kHz, R
L
=
8Ω, P
OUT
= 5W,
f
IN
= 1kHz
PWM 0.04
%
Fixed-frequency
modulation, unweighted
91
Spread-spectrum,
unweighted
90
Fixed-frequency
modulation, A-weighted
94
P
OUT
= 10W,
R
L
= 8Ω,
filterless
modulation
mode, BW =
22Hz to 22kHz
Spread-spectrum,
A-weighted
94
dB
Fixed-frequency
modulation, unweighted
91
Spread-spectrum,
unweighted
81
Fixed-frequency
modulation, A-weighted
94
Signal-to-Noise Ratio SNR
P
OUT
= 10W,
R
L
= 8Ω, PWM
mode, BW =
22Hz to 22kHz
Spread-spectrum,
A-weighted
89
dB
ELECTRICAL CHARACTERISTICS (continued)
(V
PVDD
= 12V, V
DD
= 3.3V, V
GND
= V
PGND
= 0V, V
MUTE
= 0V; max volume setting; all speaker load resistors connected between
OUT_+ and OUT_-, R
L
= ∞, unless otherwise stated, C
BOOT_
= 0.1µF, C
BIAS
= 2.2µF, C
IN
= 0.47µF, R
IN
= 20kΩ, R
F_
= 20kΩ, spread-
spectrum mode, filterless modulation mode, see the
Functional Diagrams/Typical Application Circuits. T
A
= T
MIN
to T
MAX
, unless oth-
erwise noted. Typical values are at T
A
= +25°C.) (Note 1)