Datasheet

MAX9768
10W Mono Class D Speaker
Amplifier with Volume Control
10 ______________________________________________________________________________________
WIDEBAND OUTPUT SPECTRUM
(SPREAD-SPECTRUM MODULATION MODE)
MAX9768 toc31
FREQUENCY (MHz)
100010 100
-90
-100
-80
-70
-30
-40
-50
-60
0
-10
-20
1
OUTPUT AMPLITUDE (dBV)
RBW = 10kHz
INPUT AC GROUNDED
PWM MODE
TURN-ON/OFF RESPONSE
(MAX9768)
MAX9768 toc32
100ms/div
SHDN
2V/div
OUT
500mA/div
TURN-ON/OFF RESPONSE
(MAX9768B)
MAX9768 toc33
40ms/div
SHDN
2V/div
OUT
500mA/div
VOLUME CONTROL LEVEL
vs. VOLUME CONTROL VOLTAGE
MAX9768 toc34
V
VOL
(V)
3.52.01.51.00.5 3.02.5
-100
-80
-60
-20
-40
20
0
-120
0
VOLUME LEVEL (dB)
SUPPLY CURRENT (PV
DD
)
vs. SUPPLY VOLTAGE
MAX9768 toc35
SUPPLY VOLTAGE (V)
14108612
0.5
1.0
1.5
3.0
2.0
2.5
4.0
3.5
0
4
SUPPLY CURRENT (mA)
PWM MODE
R
L
= ∞
FILTERLESS MODULATION
SUPPLY CURRENT (V
DD
)
vs. SUPPLY VOLTAGE
MAX9768 toc36
SUPPLY VOLTAGE (V)
3.63.23.02.8 3.4
7
9
13
11
15
5
2.6
SUPPLY CURRENT (mA)
PWM MODE
FILTERLESS MODULATION
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
MAX9768 toc37
SUPPLY VOLTAGE (V)
14108612
0.35
0.45
0.40
0.50
0.30
4
SHUTDOWN CURRENT (μA)
SHUTDOWN CURRENT = I
PVDD
+ I
DD
V
DD
= 3.3V
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.)