MAX98356EWL+ Maxim Integrated, MAX98356EWL+ Datasheet - Page 14

• Manufacturer Part Number: MAX98356EWL+
• Description: Audio Amplifiers PCM Input Class D Audio Power Amp
• Manufacturer: Maxim Integrated

Specifications of MAX98356EWL+

• Rohs: yes
• Product: Class-D
• Output Power: 3.2 W
• Thd Plus Noise: 0.013 %
• Operating Supply Voltage: 2.5 V to 5.5 V
• Supply Current: 1.7 mA
• Maximum Power Dissipation: 1096 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: WLP-9
• Minimum Operating Temperature: - 40 C

Figure 2
depth is one bit and each bit alternates between left-
channel and right-channel data.
If the PDM generator produces data that is stuck at logic-
high or logic-low, then the output of the IC is railed, forc-
ing DC at the load. Therefore, it is recommended that the
PDM generator includes protection to detect this invalid
condition. If such a condition is detected, then the IC
should either be put into shutdown or PDM_CLK should
be stopped.
If PDM_CLK stops toggling, the IC automatically enters
standby mode. In standby mode, the Class D speaker
amplifier is turned off and the outputs go into a high-
impedance state, ensuring that the unwanted current is not
transferred to the load during this condition. Standby mode
should not be used in place of the shutdown mode because
Figure 2. PDM Digital Audio Interface Timing
Table 5. SD_MODE Control
SD_MODE = LOGIC-HIGH
SD_MODE = PULLUP THROUGH R
SD_MODE = PULLUP THROUGH R
shows the PDM operation of the IC. The bit-
PDM_DATA
PDM_DATA
PDM_DATA
PDM_CLK
PDM_CLK
PDM_CLK
Pullup through R
Pullup through R
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High
Low
L
L
L
PDM Input Class D Audio Power Amplifier
R
R
R
L
L
L
SMALL
LARGE
LARGE
SMALL
PDM Timing Characteristics
R
R
R
L
L
L
R
R
R
SD_MODE STATUS
L
L
L
R
R
R
Standby Mode
L
L
L
R
R
R
LEFT AND RIGHT CHANNELS AVERAGED
L
L
L
B1 trip point (0.77V typ) > V
R
R
R
B2 trip point (1.4V typ) > V
B0 trip point (0.16V typ) > V
RIGHT CHANNEL IGNORED
V
LEFT CHANNEL IGNORED
SD_MODE
L
L
L
R
R
R
B1 trip point (0.77V typ)
B0 trip point (0.16V typ)
L
L
L
R
R
R
> B2 trip point (1.4V typ)
the shutdown mode provides the lowest power consump-
tion and the best power-on/off click-and-pop performance.
The IC features a low-power shutdown mode, drawing
less than 0.6FA (typ) of supply current. During shutdown,
all internal blocks are turned off, including setting the
output stage to a high-impedance state. Drive SD_MODE
low to put the IC into shutdown.
The state of SD_MODE determines the audio channel
that is sent to the amplifier output
Drive SD_MODE high to select the left channel of the
stereo input data. Drive SD_MODE high through a suf-
ficiently small resistor to select the right channel of
the stereo input data. Drive SD_MODE high through a
sufficiently large resistor to select both the left and right
channels of the stereo input data ((left + right)/2). The (left
+ right)/2 mode is not supported for PDM_CLK rates above
5.28MHz. R
L
L
L
R
R
R
L
L
L
SD_MODE Pin and Shutdown Operation
R
R
R
L
L
L
SD_MODE
LARGE
SD_MODE
R
R
R
SD_MODE
L
L
L
R
R
R
and R
L
L
L
>
>
R
R
R
L
L
L
SMALL
R
R
R
L
L
L
SELECTED CHANNEL
MAX98356
R
R
R
are determined by the
(Table
(Left + right)/2
L
L
L
Shutdown
R
R
R
Right
Left
L
L
L
5).
R
R
R