Datasheet

MAX9742
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
_______________________________________________________________________________________ 5
Note 2: All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design.
Note 3: Supply pumping may occur at high output powers with low audio frequencies. Use proper supply bypassing to prevent the
device from entering overvoltage protection due to supply pumping. See the
Supply Pumping Effects and the Supply
Undervoltage and Overvoltage Protection
sections.
Note 4: Amplifier inputs AC-coupled to ground.
Note 5: For R
L
= 4Ω, L
F
= 22µH and C
F
= 0.68µF. For R
L
= 6Ω, L
F
= 33µH and C
F
= 0.47µF. For R
L
= 8Ω, L
F
= 47µH and C
F
=
0.33µF.
Note 6: Testing performed with four-layer PCB.
Note 7: Both channels driven in phase.
Note 8: Testing performed with an 8Ω resistor connected between LC filter output and ground. Mode transitions are controlled by
SHDN. K
CP
level is calculated as 20log[(peak voltage during mode transition, no input signal) / 1V
RMS
].
Note 9: Digital input specifications apply to both single-supply and dual-supply operation.
Note 10: Channels driven 180° out-of-phase. Load connected between LC filter outputs.
Note 11: L
F
= 22µH and C
F
= 0.68µF.
Note 12: Testing performed with an 8Ω resistor connected between LC filter outputs. Mode transitions are controlled by SHDN. K
CP
level is calculated as 20log[(peak voltage during mode transition, no input signal) / 1V
RMS
].
ELECTRICAL CHARACTERISTICS—Single-Supply, BTL Configuration
(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)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Output Offset Voltage (Note 4) 7 mV
V
DD
= 20V to 40V 88
Power-Supply Rejection Ratio
(Note 4)
PSRR
V
DD
= 24V + 500mV
P-P
, f = 1kHz 77
dB
Continuous Output Power P
OUT
R
L
= 8Ω, f
IN
= 1kHz, THD+N = 10%,
(Notes 6, 10, and 11)
32 W
Efficiency
R
L
= 8Ω, P
OUT
= 10W, THD+N = 10%,
(Notes 5 and 6)
83 %
Total Harmonic Distortion Plus
Noise (Notes 6, 10, and 11)
THD+N
f
IN
= 1kHz, BW = 22Hz to 22kHz,
R
L
= 8Ω, P
OUT
= 10W
0.08 %
Unweighted 90
Signal-to-Noise Ratio SNR
P
OUT
= 32W, R
L
= 8Ω,
BW = 22Hz to 22kHz
(Notes 6, 10, and 11)
A-weighted 96
dB
Shutdown-to-Full Operation t
SON
68 ms
Into shutdown -47
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, 11, and 12)
Out of shutdown -32
dBV