Rainbow Electronics MAX9796 - Manual (Page 9)

MAX9796
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
_______________________________________________________________________________________ 9
INBAND OUTPUT SPECTRUM
MAX9796 toc19
FREQUENCY (Hz)
OUTPUT MAGNITUDE (dBV)
15k 10k 5k
-120
-100
-80
-60
-40
-20
0
20
-140
0 20k
SPREAD-SPECTRUM MODULATION MODE
R
L = 8 Ω
V
DD
= 5V
f = 1kHz
UNWEIGHTED
V
OUT = -60dBV
INBAND OUTPUT SPECTRUM
MAX9796 toc20
FREQUENCY (Hz)
OUTPUT MAGNITUDE (dBV)
15k 10k 5k
-120
-100
-80
-60
-40
-20
0
20
-140
0 20k
SPREAD-SPECTRUM MODULATION MODE
R
L = 8 Ω
V DD = 5V
f = 1kHz
A-WEIGHTED
V
OUT = -60dBV
WIDEBAND OUTPUT SPECTRUM
FIXED-FREQUENCY MODE
MAX9796 toc21
FREQUENCY (MHz)
OUTPUT MAGNITUDE (dBV)
100 10 1
-120
-100
-80
-60
-40
-20
0
20
-140
0.1 1000
V DD = 5V
R L = 8 Ω
INPUTS AC GROUNDED
WIDEBAND OUTPUT SPECTRUM
SPREAD-SPECTRUM MODE
MAX9796 toc22
FREQUENCY (MHz)
OUTPUT MAGNITUDE (dBV)
100 10 1
-120
-100
-80
-60
-40
-20
0
20
-140
0.1 1000
V
DD
= 5V
R L = 8 Ω
INPUTS AC GROUNDED
TURN-ON RESPONSE
MAX9796 toc23
10ms/div
SCL
2V/div
SPEAKER
OUTPUT
200mA/div
TURN-OFF RESPONSE
MAX9796 toc24
10ms/div
SCL
2V/div
SPEAKER
OUTPUT
200mA/div
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9796 toc25
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.0 4.5 4.0 3.5 3.0
10
12
14
16
8
2.5 5.5
INPUTS AC GROUNDED
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
MAX9796 toc26
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (
µ
A)
5.0 4.5 4.0 3.5 3.0
0.05
0.15
0.10
0.20
0.25
8
2.5 5.5
INPUTS AC GROUNDED
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9796 toc27
FREQUENCY (Hz)
THD+N (%)
10k 1k 100
0.01
0.1
1
0.001
10 100k
V DD = 5V
R L = 32 Ω
P OUT = 20mW
P OUT = 40mW
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.)