Rainbow Electronics MAX9768 - Manual (Page 9)

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)
100k 1k 10k 100
-90
-70
-80
-60
-50
-30
-40
0
-10
-20
-100
10
PV DD = 12V
V RIPPLE = 100mV P-P
R L = 8 Ω
PWM MODE
FILTERLESS MODULATION
POWER-SUPPLY REJECTION RATIO (V DD )
vs. FREQUENCY
MAX9768 toc23
FREQUENCY (Hz)
PSRR (dB)
100k 1k 10k 100
-90
-70
-80
-60
-50
-30
-40
0
-10
-20
-100
10
V DD = 3.3V
V RIPPLE = 100mV P-P
R L = 8 Ω
PWM MODE
FILTERLESS MODULATION
OUTPUT WAVEFORM
(FILTERLESS MODULATION)
MAX9768 toc24
1 μs/div
5V/div
5V/div
OUTPUT WAVEFORM (PWM MODE)
MAX9768 toc25
1 μs/div
5V/div
5V/div
OUTPUT FREQUENCY SPECTRUM
MAX9768 toc26
FREQUENCY (kHz)
20 10 5 15
-120
-100
-80
-40
-60
0
-20
-140
0
FFM MODE
V
IN
= -60dBV
f = 1kHz
R
L = 8 Ω
UNWEIGHTED
OUTPUT MAGNITUDE (dBV)
OUTPUT FREQUENCY SPECTRUM
MAX9768 toc27
FREQUENCY (kHz)
20 10 5 15
-120
-100
-80
-40
-60
0
-20
-140
0
V IN = -60dBV
f = 1kHz
R
L = 8 Ω
UNWEIGHTED
OUTPUT MAGNITUDE (dBV)
WIDEBAND OUTPUT SPECTRUM
(FIXED-FREQUENCY MODULATION MODE)
MAX9768 toc28
FREQUENCY (MHz)
1000 10 100
-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)
1000 10 100
-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)
1000 10 100
-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)
(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.)