Rainbow Electronics MAX9768 - Manual (Page 10)

MAX9768
10W Mono Class D Speaker
Amplifier with Volume Control
10 ______________________________________________________________________________________
WIDEBAND OUTPUT SPECTRUM
(SPREAD-SPECTRUM MODULATION MODE)
MAX9768 toc31
FREQUENCY (MHz)
1000 10 100
-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)
3.5 2.0 1.5 1.0 0.5 3.0 2.5
-100
-80
-60
-20
-40
20
0
-120
0
VOLUME LEVEL (dB)
SUPPLY CURRENT (PV
DD
)
vs. SUPPLY VOLTAGE
MAX9768 toc35
SUPPLY VOLTAGE (V)
14 10 8 6 12
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)
3.6 3.2 3.0 2.8 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)
14 10 8 6 12
0.35
0.45
0.40
0.50
0.30
4
SHUTDOWN CURRENT (
μ
A)
SHUTDOWN CURRENT = I
PVDD
+ I
DD
V DD = 3.3V
Typical Operating Characteristics (continued)
(PV DD = 12V, V DD = 3.3V = GND = PGND = 0V, V MUTE = 0V; 0dB volume setting; all speaker load resistors connected between
OUT+ and OUT-, R L = 8 Ω, unless otherwise noted. C
BIAS = 2.2µF, C1 = C2 = 0.1µF, C IN = 0.47µF, R IN = 20kΩ, R FB = 30k Ω,
spread-spectrum modulation mode.)