Rainbow Electronics MAX9796 - Manual (Page 8)

MAX9796
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
8 _______________________________________________________________________________________
EFFICIENCY
vs. OUTPUT POWER
MAX9796 toc10
OUTPUT POWER (W)
EFFICIENCY (%)
2 1
10
20
30
40
50
60
70
80
90
100
0
0 3
R L = 8 Ω
R L = 4 Ω
V DD = 5V
f = 1kHz
EFFICIENCY
vs. OUTPUT POWER
MAX9796 toc11
OUTPUT POWER (W)
EFFICIENCY (%)
1.5 1.0 0.5
10
20
30
40
50
60
70
80
90
100
0
0 2.0
R L = 8 Ω
R L = 4 Ω
V DD = 3.3V
f = 1kHz
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9796 toc12
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
5.0 4.5 3.0 3.5 4.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
2.5 5.5
THD+N = 10%
THD+N = 1%
R L = 4 Ω
f = 1kHz
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9796 toc13
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
5.0 4.5 4.0 3.5 3.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0
2.5 5.5
THD+N = 10%
THD+N = 1%
R L = 8 Ω
f = 1kHz
OUTPUT POWER
vs. LOAD
MAX9796 toc14
LOAD ( Ω)
OUTPUT POWER (W)
10
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
1 100
THD+N = 10%
THD+N = 1%
V DD = 5V
f = 1kHz
OUTPUT POWER
vs. LOAD
MAX9796 toc15
LOAD ( Ω)
OUTPUT POWER (W)
10
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0
1 100
THD+N = 10%
THD+N = 1%
V
DD
= 3.3V
f = 1kHz
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9796 toc16
FREQUENCY (Hz)
PSRR (dB)
10k 1k 100
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-120
10 100k
V DD = 3.3V
V RIPPLE = 100mV P-P
R L = 8 Ω
INBAND OUTPUT SPECTRUM
MAX9796 toc17
FREQUENCY (Hz)
OUTPUT MAGNITUDE (dBV)
15k 10k 5k
-120
-100
-80
-60
-40
-20
0
20
-140
0 20k
FIXED-FREQUENCY MODULATION MODE
R
L = 8 Ω
V DD = 5V
f = 1kHz
UNWEIGHTED
V
OUT = -60dBV
INBAND OUTPUT SPECTRUM
MAX9796 toc18
FREQUENCY (Hz)
OUTPUT MAGNITUDE (dBV)
15k 10k 5k
-120
-100
-80
-60
-40
-20
0
20
-140
0 20k
FIXED-FREQUENCY MODULATION MODE
R
L
= 8 Ω
V DD = 5V
f = 1kHz
A-WEIGHTED
V
OUT = -60dBV
Typical Operating Characteristics (continued)
(V DD = PV DD = CPV DD = 3.3V, GND = PGND = CPGND = 0V, SHDN = V DD , I 2 C settings (INA gain = +20dB, INB gain = INC gain =
0dB, volume setting = 0dB, mono path gain = 0dB, SHDN = 1, SSM = 1). C1 = C2 = C3 = 1µF. Speaker load resistors (R LSP ) are ter-
minated between OUT+ and OUT-, headphone load resistors are terminated to GND, unless otherwise noted.)