Datasheet
MAX9742
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
8 _______________________________________________________________________________________
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9742 toc19
FREQUENCY (Hz)
THD+N (%)
10k1k
0.1
1
10
0.01
100 100k
SINGLE SUPPLY
V
DD
= 24V
R
L
= 8
Ω
P
OUT
= 50mW
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9742 toc20
FREQUENCY (Hz)
THD+N (%)
10k1k
0.1
1
10
0.01
100 100k
SINGLE SUPPLY
V
DD
= 24V
R
L
= 4
Ω
P
OUT
= 50mW
TOTAL HARMONIC DISTORTION PLUS NOISE vs.
OUTPUT POWER WITH AND WITHOUT T-NETWORK
MAX9742 toc21
OUTPUT POWER PER CHANNEL (W)
THD+N (%)
0.10.01 101
0.1
1
10
100
0.01
0.001 100
WITHOUT T-NETWORK
WITH T-NETWORK
SINGLE SUPPLY
V
DD
= 24V
R
L
= 8
Ω
f = 1kHz
EFFICIENCY AND POWER
DISSIPATION vs. OUTPUT POWER
MAX9742 toc22
OUTPUT POWER PER CHANNEL (W)
EFFICIENCY (%)
510
90
80
70
60
50
40
30
20
10
100
0
POWER DISSIPATION (W)
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
5.0
0
015
SYSTEM POWER
DISSIPATION
EFFICIENCY
SINGLE SUPPLY
V
DD
= 30V
R
L
= 8
Ω
f
IN
= 1kHz
EFFICIENCY AND POWER
DISSIPATION vs. OUTPUT POWER
MAX9742 toc23
OUTPUT POWER PER CHANNEL (W)
EFFICIENCY (%)
51015
90
80
70
60
50
40
30
20
10
100
0
POWER DISSIPATION (W)
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
5.0
0
020
SYSTEM POWER
DISSIPATION
EFFICIENCY
DUAL SUPPLY
R
L
= 8
Ω
f
IN
= 1kHz
EFFICIENCY AND POWER
DISSIPATION vs. OUTPUT POWER
MAX9742 toc24
OUTPUT POWER PER CHANNEL (W)
EFFICIENCY (%)
510
90
80
70
60
50
40
30
20
10
100
0
POWER DISSIPATION (W)
2.0
1.5
1.0
0.5
2.5
0
015
SYSTEM POWER
DISSIPATION
EFFICIENCY
SINGLE SUPPLY
V
DD
= 24V
R
L
= 8Ω
f
IN
= 1kHz
EFFICIENCY AND POWER
DISSIPATION vs. OUTPUT POWER
MAX9742 toc25
OUTPUT POWER PER CHANNEL (W)
EFFICIENCY (%)
5101520
80
70
60
50
40
30
20
10
90
0
POWER DISSIPATION (W)
8
7
6
5
4
3
2
1
9
0
025
SYSTEM POWER
DISSIPATION
EFFICIENCY
SINGLE SUPPLY
V
DD
= 24V
R
L
= 4Ω
f
IN
= 1kHz
Typical Operating Characteristics (continued)
(24V single-supply mode, ±15V dual-supply mode, both channels driven in phase, THD+N measurement bandwidth = 22Hz to
22kHz, T
A
= +25°C, unless otherwise noted. See Figure 1 for test circuits, see
Typical Application Circuits/Functional Diagrams
for
test circuit component values.)