Datasheet

MAX9768
10W Mono Class D Speaker
Amplifier with Volume Control
_______________________________________________________________________________________ 9
POWER-SUPPLY REJECTION RATIO (PV
DD
)
vs. FREQUENCY
MAX9768 toc22
FREQUENCY (Hz)
PSRR (dB)
100k1k 10k100
-90
-70
-80
-60
-50
-30
-40
0
-10
-20
-100
10
PV
DD
= 12V
V
RIPPLE
= 100mV
P-P
R
L
= 8Ω
PWM MODE
FILTERLESS MODULATION
POWER-SUPPLY REJECTION RATIO (V
DD
)
vs. FREQUENCY
MAX9768 toc23
FREQUENCY (Hz)
PSRR (dB)
100k1k 10k100
-90
-70
-80
-60
-50
-30
-40
0
-10
-20
-100
10
V
DD
= 3.3V
V
RIPPLE
= 100mV
P-P
R
L
= 8Ω
PWM MODE
FILTERLESS MODULATION
OUTPUT WAVEFORM
(FILTERLESS MODULATION)
MAX9768 toc24
1μs/div
5V/div
5V/div
OUTPUT WAVEFORM (PWM MODE)
MAX9768 toc25
1μs/div
5V/div
5V/div
OUTPUT FREQUENCY SPECTRUM
MAX9768 toc26
FREQUENCY (kHz)
2010515
-120
-100
-80
-40
-60
0
-20
-140
0
FFM MODE
V
IN
= -60dBV
f = 1kHz
R
L
= 8Ω
UNWEIGHTED
OUTPUT MAGNITUDE (dBV)
OUTPUT FREQUENCY SPECTRUM
MAX9768 toc27
FREQUENCY (kHz)
2010515
-120
-100
-80
-40
-60
0
-20
-140
0
V
IN
= -60dBV
f = 1kHz
R
L
= 8Ω
UNWEIGHTED
OUTPUT MAGNITUDE (dBV)
WIDEBAND OUTPUT SPECTRUM
(FIXED-FREQUENCY MODULATION MODE)
MAX9768 toc28
FREQUENCY (MHz)
100010 100
-90
-100
-80
-70
-30
-40
-50
-60
0
-10
-20
1
RBW = 10kHz
INPUT AC GROUNDED
FILTERLESS MODULATION
OUTPUT AMPLITUDE (dBV)
WIDEBAND OUTPUT SPECTRUM
(FIXED-FREQUENCY MODULATION MODE)
MAX9768 toc29
FREQUENCY (MHz)
100010 100
-90
-100
-80
-70
-30
-40
-50
-60
0
-10
-20
1
RBW = 10kHz
INPUT AC GROUNDED
PWM MODE
OUTPUT AMPLITUDE (dBV)
WIDEBAND OUTPUT SPECTRUM
(SPREAD-SPECTRUM MODULATION MODE)
MAX9768 toc30
FREQUENCY (MHz)
100010 100
-90
-100
-80
-70
-30
-40
-50
-60
0
-10
-20
1
OUTPUT AMPLITUDE (dBV)
RBW = 10kHz
INPUT AC GROUNDED
FILTERLESS MODULATION
_______________________________________________________________________________________ 9
Typical Operating Characteristics (continued)
(V
PV
DD
= 12V, V
DD
= 3.3V, V
GND
= V
PGND
= 0, V
MUTE
= 0; 0dB volume setting; all speaker load resistors connected between OUT+
and OUT-, R
L
= 8Ω, unless otherwise noted. C
BIAS
= 2.2µF, C1 = C2 = 0.1µF, C
IN
= 0.47µF, R
IN
= 20kΩ, R
FB
= 30kΩ, spread-spec-
trum modulation mode.)