Datasheet
MAX9742
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
R
L
= 8Ω, P
OUT
= 3.5W 0.06
Total Harmonic Distortion Plus
Noise
THD+N
f
IN
= 1kHz,
BW = 22Hz to 22kHz
(Notes 5, 6, and 7)
R
L
= 4Ω, P
OUT
= 5W 0.08
%
Unweighted 88
Signal-to-Noise Ratio SNR
P
OUT
= 9.5W, R
L
= 8Ω,
BW = 22Hz to 22kHz
(Notes 5 and 6)
A-weighted 93
dB
Half-Bridge Switch
On-Resistance
R
DS
(
ON
)
0.4 0.7 Ω
Switch Rise and Fall Times No load (Note 4) 50 ns
IN_ Input Bias Current -1 +1 µA
MID Input Bias Current I
MID
V
DD
= 24V, no load 50 µA
Shutdown-to-Full Operation t
SON
68 ms
Power-On to Full Operation t
PU
V
SHDN
= 3.3V 1.5 s
Thermal-Overload Threshold
Temperature
T
SH
Junction temperature 150
o
C
Short-Circuit Output Current I
SC
OUT_ shorted to V
DD
or V
SS
2.9 4.5 A
Into shutdown -38
Click-and-Pop K
CP
P eak vol tag e, 32- sam p l es
p er second , A- w ei g hted
( N otes 4 and 8)
Out of shutdown -40
dBV
DIGITAL INPUTS (SHDN) (Note 9)
Logic-Input Low Voltage V
IL
0.4 V
Logic-Input High Voltage V
IH
2.4 V
Input Leakage Current -1 +1 µA
ELECTRICAL CHARACTERISTICS—Single-Supply, Single-Ended Output (continued)
(V
DD
= 24V, V
SS
= V
SUB
= LGND = 0V, V
SHDN
= 3.3V, V
MID
= 12V, C
VDD
= 660µF, C
MID1
= 10µF, C
MID2
= 10µF, R1 = R2 = R3 =
10kΩ, C
SFT
= 0.47µF, C
OUT
= 1000µF, C
FB_1
= 150pF, C
FB_2
= 10pF, C
BOOT
= 0.1µF, C
REGP
= C
REGM
= 1µF, R
IN_
= 30.1kΩ,
R
F1A
= 121kΩ, R
F1B
= 562kΩ, R
F2
= 681kΩ, R
REF
= 68kΩ, R
L
= ∞, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 2)
ELECTRICAL CHARACTERISTICS—Dual Supplies
(V
DD
= 15V, V
SS
= V
SUB
= -15V, V
SHDN
= 3.3V, V
MID
= LGND = 0V, C
VDD
= C
VSS
= 1000µF, C
BYP
= 1µF, C
SFT
= 0.22µF, C
FB_1
=
150pF, C
FB_2
= 10pF, C
BOOT
= 0.1µF, C
REGP
= C
REGM
= 1µF, R
IN_
= 30.1kΩ, R
F1A
= 121kΩ, R
F1B
= 562kΩ, R
F2
= 681kΩ, R
REF
=
68kΩ, R
L
= ∞, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
P osi ti ve S up p l y V ol tag e Rang eV
DD
(Note 3) 10 20 V
N eg ati ve S up p l y V ol tag e
Rang e
V
SS
(Note 3) -20 -10 V
Positive Supply Mute Mode
Current
No load, V
SFT
= 0V (outputs not switching) 8 11 mA
Negative Supply Mute Mode
Current
No load, V
SFT
= 0V (outputs not switching) -12 -8 mA