Datasheet

MAX9742
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
______________________________________________________________________________________ 11
ENTERING SHUTDOWN
MAX9742 toc44
10ms/div
V
OUT_
20V/div
V
SHDN
2V/div
FILTERED
V
OUT_
5V/div
DUAL SUPPLY
R
L
= 8Ω
EXITING SHUTDOWN
MAX9742 toc45
20ms/div
V
OUT_
10V/div
V
SHDN
2V/div
FILTERED
V
OUT_
5V/div
SINGLE SUPPLY
R
L
= 8Ω
ENTERING SHUTDOWN
(SINGLE SUPPLY)
MAX9742 toc46
10ms/div
V
OUT_
10V/div
V
SHDN
2V/div
FILTERED
V
OUT_
5V/div
SINGLE SUPPLY
R
L
= 8Ω
CASE TEMPERATURE
vs. OUTPUT POWER
MAX9742 toc47
OUTPUT POWER PER CHANNEL (W)
CASE TEMPERATURE (°C)
810
50
0
30
10
40
20
012462
SINGLE SUPPLY
V
DD
= 24V
R
L
= 8Ω
4-LAYER PCB
CASE TEMPERATURE
vs. OUTPUT POWER
MAX9742 toc48
OUTPUT POWER PER CHANNEL (W)
CASE TEMPERATURE (°C)
10 15
120
0
80
40
20
100
60
0205
SINGLE SUPPLY
V
DD
= 24V
R
L
= 4Ω
4-LAYER PCB
OUTPUT WAVEFORM
MAX9742 toc49
1µs/div
V
OUT
10V/div
V
OUTR
10V/div
SINGLE SUPPLY, V
DD
= 24V
INPUTS AC GROUNDED
EMI AMPLITUDE vs. FREQUENCY
MAX9742 toc50
FREQUENCY (MHz)
AMPLITUDE (dBµV/m)
100
40
5
30
10
20
35
15
25
30 1000
9.4dBµV/m BELOW LIMIT
18.1dBµV/m
BELOW LIMIT
EN55022B LIMIT
12.8dBµV/m
BELOW LIMIT
SINGLE SUPPLY
R
L
= 8Ω, P
OUT
= 1.25W
SPEAKER CABLE
LENTH = 1m
EMI AMPLITUDE vs. FREQUENCY
MAX9742 toc51
FREQUENCY (MHz)
AMPLITUDE (dBµV/m)
100
40
5
30
10
20
35
15
25
30 1000
SINGLE SUPPLY
R
L
= 4Ω, P
OUT_
= 1.25W
SPEAKER CABLE
LENTH = 1m
11.3dBµV/m
BELOW LIMIT
3.6dBµV/m
BELOW LIMIT
7.8dBµV/m
BELOW LIMIT
7dBµV/m
BELOW
LIMIT
5.8dBµV/m
BELOW LIMIT
EN55022B LIMIT
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.)