Instruction Manual

MAX9796
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
10 ______________________________________________________________________________________
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9796 toc28
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
V
DD
= 3.3V
R
L
= 16Ω
P
OUT
= 20mW
P
OUT
= 40mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9796 toc29
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
V
DD
= 3.3V
R
L
= 32Ω
P
OUT
= 10mW
P
OUT
= 40mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9796 toc30
OUTPUT POWER (mW)
THD+N (%)
604020
0.01
0.1
1
10
100
0.001
080
V
DD
= 5V
R
L
= 32Ω
f = 10kHz
f = 20Hz
f = 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
OUTPUT POWER (mW)
THD+N (%)
MAX9796 toc31
0 306090120
0.001
0.01
0.1
1
10
100
f = 20Hz
f = 1kHz
f = 10kHz
V
DD
= 3.3V
R
L
= 16Ω
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9796 toc32
OUTPUT POWER (mW)
THD+N (%)
604020
0.01
0.1
1
10
100
0.001
080
V
DD
= 3.3V
R
L
= 32Ω
f = 10kHz
f = 20Hz
f = 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. COMMON-MODE VOLTAGE
COMMON-MODE VOLTAGE (V)
THD+N (%)
MAX9796 toc33
0 0.5 1.0 1.5 2.0 2.5
0.001
0.01
0.1
1
10
100
V
DD
= 3.3V
f
IN
= 1kHz
P
OUT
= 30mW
GAIN = +3dB
R
L
= 32Ω
POWER DISSIPATION
vs. OUTPUT POWER
MAX9796 toc34
TOTAL OUTPUT POWER (mW)
POWER DISSIPATION (mW)
8040
50
100
150
200
250
300
350
400
450
500
0
0 120
V
DD
= 5V
f = 1kHz
R
L
= 32Ω
P
OUT
= P
OUTR
+ P
OUTL
POWER DISSIPATION
vs. OUTPUT POWER
MAX9796 toc35
TOTAL OUTPUT POWER (mW)
POWER DISSIPATION (mW)
1208040
50
100
150
200
250
300
350
400
450
500
0
0 160
V
DD
= 3.3V
f = 1kHz
P
OUT
= P
OUTR
+ P
OUTL
R
L
= 16Ω
R
L
= 32Ω
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9796 toc36
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
5.24.74.23.73.2
35
40
45
50
55
60
65
30
2.7
THD+N = 10%
THD+N = 1%
R
L
= 32Ω
f = 1kHz
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.)