max9746 Maxim Integrated Products, Inc., max9746 Datasheet - Page 5
max9746
Manufacturer Part Number
max9746
Description
Max9746 1.2w, Low-emi, Filterless, Class D Audio Amplifier
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.MAX9746.pdf
(16 pages)
(V
DD
100
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
90
80
70
60
50
40
30
20
10
= 3.3V, SYNC = V
0
0
2.5
0
3.0
0.2
THD+N = 10%
-100
-10
-20
-30
-40
-50
-60
-70
-80
-90
vs. SUPPLY VOLTAGE
vs. OUTPUT POWER
0
SUPPLY VOLTAGE (V)
OUTPUT POWER
OUTPUT POWER (W)
3.5
10
0.4
EFFICIENCY
_______________________________________________________________________________________
OUTPUT REFERRED
INPUTS AC GROUNDED
V
POWER-SUPPLY REJECTION RATIO
DD
DD
4.0
= 3.3V
0.6
(SSM), T
100
THD+N = 1%
4.5
vs. FREQUENCY
FREQUENCY (Hz)
0.8
V
f
R
IN
DD
L
f
R
IN
L
= 1kHz
= 8Ω
5.0
= 1kHz
= 8Ω
A
= 5.0V
1k
= +25°C, unless otherwise noted.)
1.0
5.5
10k
Typical Operating Characteristics (continued)
100
2.5
2.0
1.5
1.0
0.5
90
80
70
60
50
40
30
20
10
0
0
100k
3.0
1
3.5
vs. LOAD RESISTANCE
vs. SUPPLY VOLTAGE
1.2W, Low-EMI, Filterless,
LOAD RESISTANCE (Ω)
SUPPLY VOLTAGE (V)
OUTPUT POWER
10
EFFICIENCY
4.0
Class D Audio Amplifier
5.0V
4.5
3.3V
f
Z
SERIES WITH R
THD+N = 1%
IN
100
LOAD
= 1kHz
f
THD+N = 1%
R
IN
L
= 1kHz
= 8Ω
= 3.3µH IN
5.0
MAX9746
OUTPUT
V
L
DD
1000
5.5
f = 217Hz
INPUT LOW = 3V
INPUT HIGH = 3.5V
GSM POWER-SUPPLY REJECTION
-100
-10
-20
-30
-40
-50
-60
-70
-80
-90
90
80
70
60
50
40
30
20
10
0
0
800
10
INPUT REFERRED
V
COMMON-MODE REJECTION RATIO
IN
2ms/div
1000
= 200mV
100
vs. SYNC FREQUENCY
SYNC FREQUENCY (kHz)
DUTY CYCLE = 88%
R
1200
P-P
vs. FREQUENCY
L
FREQUENCY (Hz)
EFFICIENCY
= 8Ω
MAX9746 toc16
1400
1k
1600
500mV/div
100µV/div
V
f
THD+N = 1%
R
IN
10k
DD
L
= 1kHz
= 8Ω
1800
= 3.3V
2000
100k
5