Typical operating characteristics (continued) – Rainbow Electronics MAX9768 User Manual
Page 7
MAX9768
10W Mono Class D Speaker
Amplifier with Volume Control
_______________________________________________________________________________________
7
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9768 toc04
FREQUENCY (Hz)
THD+N (%)
10k
1k
100
0.1
0.01
1
10
0.001
10
100k
PV
DD
= 5V
R
L
= 8
Ω
PWM MODE
OUTPUT POWER = 300mW
OUTPUT POWER = 800mW
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9768 toc05
FREQUENCY (Hz)
THD+N (%)
0.1
0.01
1
10
0.001
PV
DD
= 12V
R
L
= 8
Ω
FILTERLESS MODULATION
P
OUT
= 4W
10k
1k
100
10
100k
FIXED-FREQUENCY
MODULATION
SPREAD-SPECTRUM
MODULATION
MAX9768 toc06
FREQUENCY (Hz)
THD+N (%)
0.1
0.01
1
10
0.001
PV
DD
= 12V
R
L
= 8
Ω
PWM MODE
P
OUT
= 4W
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
10k
1k
100
10
100k
FIXED-FREQUENCY
MODULATION
SPREAD-SPECTRUM
MODULATION
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9768 toc07
OUTPUT POWER (W)
THD+N (%)
10
8
4
6
2
0.1
0.01
1
100
10
0.001
0
12
PV
DD
= 12V
R
L
= 8
Ω
FILTERLESS MODULATION
f
IN
= 10kHz
f
IN
= 100Hz
f
IN
= 1kHz
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9768 toc08
OUTPUT POWER (W)
THD+N (%)
10
8
4
6
2
0.1
0.01
1
100
10
0.001
0
PV
DD
= 12V
R
L
= 8
Ω
PWM MODE
f
IN
= 10kHz
f
IN
= 100Hz
f
IN
= 1kHz
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9768 toc09
OUTPUT POWER (W)
THD+N (%)
2.0
1.0
1.5
0.5
0.1
0.01
1
100
10
0.001
0
PV
DD
= 5V
R
L
= 8
Ω
FILTERLESS MODULATION
f
IN
= 10kHz
f
IN
= 100Hz
f
IN
= 1kHz
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9768 toc10
OUTPUT POWER (W)
THD+N (%)
2.0
0.8
1.2
1.6
0.4
0.1
0.01
1
100
10
0.001
0
PV
DD
= 5V
R
L
= 8
Ω
PWM MODE
f
IN
= 10kHz
f
IN
= 100Hz
f
IN
= 1kHz
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9768 toc11
OUTPUT POWER (W)
THD+N (%)
10
4
6
8
2
0.1
1
100
10
0.01
0
PV
DD
= 12V
R
L
= 8
Ω
f
IN
= 1kHz
FILTERLESS MODULATION
FIXED-FREQUENCY
MODULATION
SPREAD-SPECTRUM
MODULATION
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9768 toc12
OUTPUT POWER (W)
THD+N (%)
10
4
6
8
2
0.1
1
100
10
0.01
0
PV
DD
= 12V
R
L
= 8
Ω
f
IN
= 1kHz
PWM MODE
FIXED-FREQUENCY
MODULATION
SPREAD-SPECTRUM
MODULATION
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.)