max9742 Maxim Integrated Products, Inc., max9742 Datasheet - Page 11

• Manufacturer Part Number: max9742
• Description: Max9742 Single-/dual-supply, Stereo 16w, Class D Amplifier With Differential Inputs
• Manufacturer: Maxim Integrated Products, Inc.

FILTERED
(24V single-supply mode, ±15V dual-supply mode, both channels driven in phase, THD+N measurement bandwidth = 22Hz to
22kHz, T
test circuit component values.)
20V/div
V
2V/div
5V/div
V
V
SHDN
OUT_
OUT_
50
40
30
20
10
0
0
DUAL SUPPLY
R
A
L
= +25°C, unless otherwise noted. See Figure 1 for test circuits, see Typical Application Circuits/Functional Diagrams for
= 8Ω
OUTPUT POWER PER CHANNEL (W)
2
ENTERING SHUTDOWN
CASE TEMPERATURE
vs. OUTPUT POWER
4
Class D Amplifier with Differential Inputs
______________________________________________________________________________________
10ms/div
40
35
30
25
20
15
10
5
30
6
SINGLE SUPPLY
R
SPEAKER CABLE
LENTH = 1m
9.4dBµV/m BELOW LIMIT
L
EMI AMPLITUDE vs. FREQUENCY
= 8Ω, P
18.1dBµV/m
BELOW LIMIT
SINGLE SUPPLY
V
R
4-LAYER PCB
8
DD
L
= 8Ω
= 24V
OUT
MAX9742 toc44
10
FREQUENCY (MHz)
100
= 1.25W
12
Single-/Dual-Supply, Stereo 16W,
12.8dBµV/m
BELOW LIMIT
FILTERED
EN55022B LIMIT
10V/div
V
2V/div
5V/div
V
V
SHDN
OUT_
OUT_
Typical Operating Characteristics (continued)
120
100
80
60
40
20
0
MAX9742 toc50
0
SINGLE SUPPLY
R
L
SINGLE SUPPLY
V
R
4-LAYER PCB
DD
L
= 8Ω
1000
= 4Ω
OUTPUT POWER PER CHANNEL (W)
= 24V
EXITING SHUTDOWN
CASE TEMPERATURE
5
vs. OUTPUT POWER
20ms/div
10
15
MAX9742 toc45
40
35
30
25
20
15
10
5
30
20
SINGLE SUPPLY
R
SPEAKER CABLE
LENTH = 1m
7dBµV/m
BELOW
LIMIT
L
EMI AMPLITUDE vs. FREQUENCY
= 4Ω, P
FILTERED
10V/div
10V/div
10V/div
V
2V/div
5V/div
V
V
V
11.3dBµV/m
BELOW LIMIT
V
OUT_
SHDN
OUTR
OUT_
OUT_
OUT
100
FREQUENCY (MHz)
= 1.25W
SINGLE SUPPLY, V
INPUTS AC GROUNDED
7.8dBµV/m
BELOW LIMIT
ENTERING SHUTDOWN
OUTPUT WAVEFORM
5.8dBµV/m
BELOW LIMIT
EN55022B LIMIT
(SINGLE SUPPLY)
3.6dBµV/m
BELOW LIMIT
MAX9742 toc51
10ms/div
DD
1µs/div
= 24V
1000
SINGLE SUPPLY
R
L
= 8Ω
MAX9742 toc49
MAX9742 toc46
11