Datasheet

MAX9737
Mono 7W Class D Amplifier
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PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT AMPLIFIER CHARACTERISTICS
Output Amplifier Gain A
V
Preamplifier gain = 0dB (Note 7) 13.1 13.6 14.1 dB
Output Current Limit 3 4.6 A
Output Offset V
OS
OUT+ to OUT-, T
A
= +25°C ±2 ±10 mV
V
PVDD
= 8V to 28V, T
A
= +25°C 65 80
Power-Supply Rejection Ratio PSRR
f = 1kHz, 100mV
P-P
ripple 88
dB
THD+N = 10%, R
L
= 8Ω (Note 5) 6 7.4
Output Power P
OUT
THD+N = 10%, R
L
= 4Ω (Note 6) 13
W
THD + Noise THD+N P
OUT
= 2W, f = 1kHz, R
L
= 8Ω (Note 5) 0.06 %
Signal-to-Noise Ratio SNR
A-weighted, P
OUT
= THD+N at 1%,
f
IN
= 1kHz
97 dB
Noise V
N
A-weighted (Note 4) 100 µV
RMS
Efficiency η P
OUT
= 4W 85 %
Into shutdown 38
Out of shutdown 38
Into mute 38
Click-and-Pop Level K
CP
Peak voltage, 32
samples/second,
A-weighted
(Notes 4, 5, 8)
Out of mute 38
dBV
Switching Frequency 270 300 330 kHz
Spread-Spectrum Bandwidth ±4 kHz
Thermal-Shutdown Level +160 °C
Thermal-Shutdown Hysteresis 30 °C
Turn-On Time t
ON
From shutdown to full operation 9 10 ms
DIGITAL INTERFACE (SHDN, MUTE)
Input-Voltage High V
INH
2V
Input-Voltage Low V
INL
0.8 V
Input-Voltage Hysteresis 50 mV
Input Leakage Current T
A
= +25°C ±10 µA
ELECTRICAL CHARACTERISTICS (continued)
(V
PVDD
= 12V, V
AGND
= V
PGND
= 0, V
SHDN
= V
MUTE
= 5V, C1 = 0.1µF, C
IN
= 0.47µF, C2 = C
COM
= C
REG
= 1µF, R
IN
= R
FB
= 20kΩ,
R
L
= ∞, AC measurement bandwidth 22Hz to 22kHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
(Note 3)
Note 3: All devices are 100% production tested at T
A
= +25°C, and all temperature limits are guaranteed by design.
Note 4: Amplifier inputs AC-coupled to GND.
Note 5: 8Ω resistive load in series with 68mH inductive load connected across OUT+ and OUT- outputs.
Note 6: 4Ω resistive load in series with 33µH inductive load connected across OUT+ and OUT- outputs for V
PVDD
≤ 12V.
Note 7: Output amplifier gain is defined as:
Note 8: Mode transition controlled by SHDN and MUTE.
20 ×
−
⎛
⎝
⎜
⎞
⎠
⎟
+−
log
|( ) ( )|
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VV
V
OUT OUT
PRE