Datasheet

MAX9744
20W Stereo Class D Speaker Amplifier
with Volume Control
_______________________________________________________________________________________ 7
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9744 toc09
OUTPUT POWER (W)
THD+N (%)
161284
0.01
0.1
1
10
100
0.001
020
PVDD = 12V
R
L
= 4Ω
f
IN
= 1kHz
PWM MODE
FFM
SSM
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9744 toc10
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
10
100
0.001
10 100k
PVDD = 12V
R
L
= 4Ω
FILTERLESS MODULATION
OUTPUT POWER = 10W
OUTPUT POWER = 5W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9744 toc11
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
10
100
0.001
10 100k
PVDD = 12V
R
L
= 4Ω
PWM MODE
OUTPUT POWER = 10W
OUTPUT POWER = 5W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9744 toc12
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
10
100
0.001
10 100k
PVDD = 12V
R
L
= 8Ω
FILTERLESS MODULATION
OUTPUT POWER = 3W
OUTPUT POWER = 6W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9744 toc13
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
10
100
0.001
10 100k
PVDD = 12V
R
L
= 8Ω
PWM MODE
OUTPUT POWER = 3W
OUTPUT POWER = 6W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9744 toc14
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
10
100
0.001
10 100k
PVDD = 5V
R
L
= 4Ω
FILTERLESS MODULATION
OUTPUT POWER = 500mW
OUTPUT POWER = 1.5W
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9744 toc16
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
10
100
0.001
10 100k
PVDD = 12V
R
L
= 4Ω
FILTERLESS MODULATION
P
OUT
= 5W
SSM
FFM
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9744 toc15
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
10
100
0.001
10 100k
PVDD = 5V
R
L
= 4Ω
PWM MODE
OUTPUT POWER = 500mW
OUTPUT POWER = 1.5W
Typical Operating 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_- 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.)