Datasheet

MAX9744
20W Stereo Class D Speaker Amplifier
with Volume Control
6 _______________________________________________________________________________________
Typical Operating Characteristics
(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_- with an inductor in series, 8Ω load, L = 68µH, 4Ω load, L= 33µH. R
L
= ∞, unless otherwise stated, C
BIAS
= 2.2µF,
C
IN
= 0.47µF, R
IN
= 20kΩ, R
F_
= 20kΩ, spread-spectrum mode, T
A
= +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9744 toc01
OUTPUT POWER (W)
THD+N (%)
18161412108642
0.01
0.1
1
10
100
0.001
020
f
IN
= 6kHz
f
IN
= 100Hz
f
IN
= 1kHz
PVDD = 12V
R
L
= 4Ω
FILTERLESS MODULATION
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9744 toc02
OUTPUT POWER (W)
THD+N (%)
161284
0.01
0.1
1
10
100
0.001
020
PVDD = 12V
R
L
= 4Ω
PWM MODE
f
IN
= 6kHz
f
IN
= 100Hz
f
IN
= 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9744 toc03
OUTPUT POWER (W)
THD+N (%)
963
0.01
0.1
1
10
100
0.001
012
PVDD = 12V
R
L
= 8Ω
FILTERLESS MODULATION
f
IN
= 6kHz
f
IN
= 100Hz
f
IN
= 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9744 toc04
OUTPUT POWER (W)
THD+N (%)
963
0.01
0.1
1
10
100
0.001
012
PVDD = 12V
R
L
= 8Ω
PWM MODE
f
IN
= 6kHz
f
IN
= 100Hz
f
IN
= 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9744 toc05
OUTPUT POWER (W)
THD+N (%)
321
0.01
0.1
1
10
100
0.001
04
f
IN
= 6kHz
f
IN
= 100Hz
f
IN
= 1kHz
PVDD = 5V
R
L
= 4Ω
FILTERLESS MODULATION
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9744 toc06
OUTPUT POWER (W)
THD+N (%)
321
0.01
0.1
1
10
100
0.001
04
PVDD = 5V
R
L
= 4Ω
PWM MODE
f
IN
= 6kHz
f
IN
= 100Hz
f
IN
= 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9744 toc08
OUTPUT POWER (W)
THD+N (%)
106842
0.01
0.1
1
10
100
0.001
012
PVDD = 12V
R
L
= 8Ω
f
IN
= 1kHz
FILTERLESS MODULATION
SSM
FFM
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9744 toc07
OUTPUT POWER (W)
THD+N (%)
161284
0.01
0.1
1
10
100
0.001
020
PVDD = 12V
R
L
= 4Ω
f
IN
= 1kHz
FILTERLESS MODULATION
FFM
SSM