Rainbow Electronics MAX9796 - Manual (Page 11)

MAX9796
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
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OUTPUT POWER
vs. LOAD
MAX9796 toc37
LOAD ( Ω)
OUTPUT POWER (mW)
100
20
40
60
80
100
120
140
160
180
200
0
10 1000
THD+N = 10%
THD+N = 1%
V DD = 5V
f = 1kHz
OUTPUT POWER
vs. LOAD
MAX9796 toc38
LOAD ( Ω)
OUTPUT POWER (mW)
100
20
40
60
80
100
120
140
160
180
200
0
10 1000
THD+N = 10%
THD+N = 1%
V DD = 3.3V
f = 1kHz
OUTPUT POWER vs. LOAD RESISTANCE
AND CHARGE-PUMP CAPACITOR SIZE
LOAD RESISTANCE ( Ω)
OUTPUT POWER (mW)
MAX9796 toc39
0
20
40
60
80
100
10 100 1000
C1 = C2 = 2.2 µF
V DD = 3.3V
f = 1kHz
THD+N = 1%
C1 = C2 = 1 µF
C1 = C2 = 0.68 µF
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
FREQUENCY (Hz)
POWER-SUPPLY REJECTION RATIO (dB)
MAX9796 toc40
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
HPL
HPR
V DD = 3.3V
V IN = 100mV P-P
R L = 32 Ω
OUTPUT FREQUENCY SPECTRUM
MAX9796 toc41
FREQUENCY (Hz)
OUTPUT MAGNITUDE (dBV)
15k 10k 5k
-120
-100
-80
-60
-40
-20
0
20
-140
0 20k
V DD = 3.3V
f = 1kHz
R L = 32 Ω
CROSSTALK vs. FREQUENCY
FREQUENCY (Hz)
CROSSTALK (dB)
MAX9796 toc42
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
OUT_ = 1V P-P
R L = 32 Ω
LEFT TO RIGHT
RIGHT TO LEFT
CROSSTALK vs. INPUT AMPLITUDE
INPUT AMPLITUDE (V RMS )
CROSSTALK (dB)
MAX9796 toc43
0 0.4 0.8 1.2
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
f IN = 1kHz
R L = 32 Ω
GAIN = +3dB
LEFT TO RIGHT
RIGHT TO LEFT
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.)