Typical operating characteristics (continued) – Rainbow Electronics MAX9770 User Manual
Page 5
MAX9770
1.2W Low-EMI, Filterless, Mono Class D Amplifier
with Stereo DirectDrive Headphone Amplifiers
_______________________________________________________________________________________
5
10
0.001
10
100
10k
100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY (SPEAKER MODE)
0.01
0.1
1
MAX9770 toc04
FREQUENCY (Hz)
THD+N (%)
1k
V
DD
= 5V
P
OUT
= 1W
R
L
= 8
Ω
SSM MODE
FFM MODE
100
0
400
800
1200
1600
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9770 toc05
OUTPUT POWER (mW)
THD+N (%)
V
DD
= 5V
R
L
= 8
Ω
f = 20Hz
f = 1kHz
f = 10kHz
100
0
200
600
400
800
1000
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9770 toc06
OUTPUT POWER (mW)
THD+N (%)
f = 20Hz
f = 1kHz
f = 10kHz
R
L
= 4
Ω
100
0
200
400
600
800
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9770 toc07
OUTPUT POWER (mW)
THD+N (%)
R
L
= 8
Ω
f = 20Hz
f = 1kHz
f = 10kHz
100
0
400
800
1200
1600
10
1
0.1
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SPEAKER MODE)
MAX9770 toc08
OUTPUT POWER (mW)
THD+N (%)
V
DD
= 5V
f = 1kHz
R
L
= 8
Ω
SSM MODE
FFM MODE
1.75
0
1
10
100
OUTPUT POWER
vs. LOAD RESISTANCE (SPEAKER MODE)
0.50
0.25
MAX9770 toc09
LOAD RESISTANCE (
Ω)
OUTPUT POWER (W)
0.75
1.00
1.25
1.50
V
DD
= 5V
f = 1kHz
THD+N = 10%
THD+N = 1%
1.0
0
1
10
100
OUTPUT POWER
vs. LOAD RESISTANCE (SPEAKER MODE)
0.2
MAX9770 toc10
LOAD RESISTANCE (
Ω)
OUTPUT POWER (W)
0.4
0.6
0.8
f = 1kHz
THD+N = 10%
THD+N = 1%
2.0
1.5
1.0
0.5
0
2.5
4.0
3.0
3.5
4.5
5.0
5.5
OUTPUT POWER
vs. SUPPLY VOLTAGE (SPEAKER MODE)
MAX9770 toc11
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
f = 1kHz
R
L
= 8
Ω
THD+N = 10%
THD+N = 1%
0
30
20
10
50
40
90
80
70
60
100
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
EFFICIENCY vs. OUTPUT POWER
MAX9770 toc12
OUTPUT POWER (W)
EFFICIENCY (%)
V
DD
= 5V
f = 1kHz
R
L
= 8
Ω
Typical Operating Characteristics (continued)
(V
DD
= 3.3V, BW = 22Hz to 22kHz, GAIN1 = 1, GAIN2 = 0, spread-spectrum mode, headphone outputs in phase.)