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MAX9770
1.2W Low-EMI, Filterless, Mono Class D Amplifier
with Stereo DirectDrive Headphone Amplifiers
_______________________________________________________________________________________ 7
10
0.001
10 100 10k 100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
0.01
0.1
1
MAX9770 toc22
FREQUENCY (Hz)
THD+N (%)
1k
P
OUT
= 10mW
P
OUT
= 50mW
V
DD
= 5V
R
L
= 16Ω
10
0.001
10 100 10k 100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
0.01
0.1
1
MAX9770 toc23
FREQUENCY (Hz)
THD+N (%)
1k
P
OUT
= 10mW
P
OUT
= 50mW
V
DD
= 5V
R
L
= 32Ω
10
0.001
10 100 10k 100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
0.01
0.1
1
MAX9770 toc24
FREQUENCY (Hz)
THD+N (%)
1k
P
OUT
= 10mW
P
OUT
= 35mW
R
L
= 16Ω
10
0.001
10 100 10k 100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (HEADPHONE MODE)
0.01
0.1
1
MAX9770 toc25
FREQUENCY (Hz)
THD+N (%)
1k
P
OUT
= 10mW
P
OUT
= 50mW
R
L
= 32Ω
100
10
1
0.1
0.01
0.001
0408020 60 100
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9770 toc26
OUTPUT POWER (mW)
THD+N (%)
V
DD
= 5V
R
L
= 16Ω
f = 1kHz
f = 20Hz
f = 10kHz
100
10
1
0.1
0.01
0.001
0
60
20 40 80
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9770 toc27
OUTPUT POWER (mW)
THD+N (%)
f = 20Hz
V
DD
= 5V
R
L
= 32Ω
f = 1kHz
f = 10kHz
100
10
1
0.1
0.01
0.001
0
50
40
2010
30 60
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9770 toc28
OUTPUT POWER (mW)
THD+N (%)
R
L
= 16Ω
f = 1kHz
f = 10kHz
f = 20Hz
100
10
1
0.1
0.01
0.001
0
60
20 40 80
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9770 toc29
OUTPUT POWER (mW)
THD+N (%)
f = 20Hz
R
L
= 32Ω
f = 1kHz
f = 10kHz
100
90
80
70
60
50
40
30
20
10
0
10 100 1000
OUTPUT POWER
vs. LOAD RESISTANCE (HEADPHONE MODE)
MAX9770 toc30
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
V
DD
= 5V
f = 1kHz
THD+N = 10%
THD+N = 1%
Typical Operating Characteristics (continued)
(V
DD
= 3.3V, BW = 22Hz to 22kHz, GAIN1 = 1, GAIN2 = 0, spread-spectrum mode, headphone outputs in phase.)