Datasheet

-140
-120
-100
-80
-60
-40
-20
0
20
0 5 10 15 20
SPREAD-SPECTRUM-MODE OUTPUT
SPECTRUM vs. FREQUENCY
MAX9705 toc25
FREQUENCY (kHz)
AMPLITUDE (dBV)
R
L
= 8
Ω
V
DD
= 5.0V
f
IN
= 1kHz
A-WEIGHTED
MAX9705
2.3W, Ultra-Low-EMI, Filterless,
Class D Audio Amplifier
6 _______________________________________________________________________________________
0
0.6
0.4
0.2
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.5 3.53.0 4.0 4.5 5.0 5.5
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9705toc19
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
f
IN
= 1kHz
R
L
= 8
Ω
THD+N = 1%
THD+N = 10%
0
1.5
1.0
0.5
2.0
2.5
3.0
3.5
2.5 3.53.0 4.0 4.5 5.0 5.5
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9705toc20
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
f
IN
= 1kHz
R
L
= 4
Ω
THD+N = 1%
THD+N = 10%
4.0
0
1 100 1000
OUTPUT POWER
vs. LOAD RESISTANCE
1.5
1.0
3.0
2.0
3.5
0.5
2.5
MAX9705 toc21
LOAD RESISTANCE (
Ω
)
OUTPUT POWER (W)
10
f
IN
= 1kHz
Z
LOAD
= 33
µ
H IN
SERIES WITH R
L
THD+N = 1%
3.3V
5.0V
0
-10
-100
10 100 10k 100k
POWER-SUPPLY REJECTION
RATIO vs. FREQUENCY
-90
-50
-70
-80
-40
-60
-20
-30
MAX9705 toc22
FREQUENCY (Hz)
PSRR (dB)
1k
V
DD
= 3.3V
V
IN
= 200mV
P-P
R
L
= 8
Ω
-140
-120
-100
-80
-60
-40
-20
0
20
0 5 10 15 20
FIXED-FREQUENCY-MODE OUTPUT
SPECTRUM vs. FREQUENCY
MAX9705 toc23
FREQUENCY (kHz)
AMPLITUDE (dBV)
R
L
= 8
Ω
V
DD
= 5.0V
f
IN
= 1kHz
BW = 22Hz to 22kHz
-140
-120
-100
-80
-60
-40
-20
0
20
0 5 10 15 20
SPREAD-SPECTRUM-MODE OUTPUT
SPECTRUM vs. FREQUENCY
MAX9705 toc24
FREQUENCY (kHz)
AMPLITUDE (dBV)
R
L
= 8Ω
V
DD
= 5.0V
f
IN
= 1kHz
BW = 22Hz to 22kHz
Typical Operating Characteristics (continued)
(V
DD
= 3.3V, SYNC = V
DD
(SSM), differential input, T
A
= +25°C, unless otherwise noted. Typical Operating Characteristics for 4Ω
load condition apply to the MAX9705_ETB+T only.)