max9746 Maxim Integrated Products, Inc., max9746 Datasheet - Page 5

• Manufacturer Part Number: max9746
• Description: Max9746 1.2w, Low-emi, Filterless, Class D Audio Amplifier
• Manufacturer: Maxim Integrated Products, Inc.

(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