MAX9746 查看數據表（PDF） - Maxim Integrated
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MAX9746 Datasheet PDF : 16 Pages
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1.2W, Low-EMI, Filterless,
Class D Audio Amplifier
Typical Operating Characteristics (continued)
(VDD = 3.3V, SYNC = VDD (SSM), TA = +25°C, unless otherwise noted.)
100
90
80
70
60
50
40
30
20
10
0
0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
2.5
EFFICIENCY
vs. OUTPUT POWER
VDD = 5.0V
fIN = 1kHz
RL = 8Ω
0.2 0.4 0.6 0.8 1.0
OUTPUT POWER (W)
OUTPUT POWER
vs. SUPPLY VOLTAGE
100
90
80
70
60
50
40
30
20
10
0
3.0
2.5
2.0
THD+N = 10%
1.5
THD+N = 1%
1.0
fIN = 1kHz
RL = 8Ω
3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
0.5
0
1
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
0
-10 OUTPUT REFERRED
INPUTS AC GROUNDED
-20 VDD = 3.3V
-30
-40
-50
-60
-70
-80
-90
-100
10
100
1k
10k
100k
FREQUENCY (Hz)
EFFICIENCY
vs. SUPPLY VOLTAGE
fIN = 1kHz
THD+N = 1%
RL = 8Ω
3.5 4.0 4.5
5.0 5.5
SUPPLY VOLTAGE (V)
OUTPUT POWER
vs. LOAD RESISTANCE
fIN = 1kHz
ZLOAD = 3.3µH IN
SERIES WITH RL
THD+N = 1%
5.0V
3.3V
10
100
1000
LOAD RESISTANCE (Ω)
EFFICIENCY
vs. SYNC FREQUENCY
90
80
70
60
50
40
30
20
10
0
800
VDD = 3.3V
fIN = 1kHz
THD+N = 1%
RL = 8Ω
1000 1200 1400 1600 1800 2000
SYNC FREQUENCY (kHz)
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
0
-10 INPUT REFERRED
VIN = 200mVP-P
-20
-30
-40
-50
-60
-70
-80
-90
-100
10
100
1k
10k
100k
FREQUENCY (Hz)
GSM POWER-SUPPLY REJECTION
MAX9746 toc16
VDD
500mV/div
MAX9746
OUTPUT
100µV/div
f = 217Hz
2ms/div
DUTY CYCLE = 88%
INPUT LOW = 3V
RL = 8Ω
INPUT HIGH = 3.5V
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