Datasheet

Maxim Integrated │ 3
www.maximintegrated.com
Evaluates: MAX98357A/MAX98357B
(WLP)
MAX98357 Development Board/
Evaluation System (WLP)
filtered outputs to the audio analyzer. The default lowpass
filters at the DEV board output are optimized for a 4Ω
speaker.
Jumper Selection
Selectable (GAIN_SLOT)
The DEV board features a 5-pin jumper (JU5) to
control the device’s five programmable gain settings. In TDM
mode, the gain is fixed at 12dB and the GAIN_SLOT pin is
repurposed for slot selection. See Table 1 for gain-control
configuration.
SD_MODE Input
The DEV board features a 4-pin jumper (JU2) to control
both the audio channel that is sent to the amplifier output,
along with shutdown mode. JU2 is used to select the
stereo input data between the left channel, right channel,
and the sum of the left/right channels. JU4 must be set to
pins 1-2 and a voltage applied to the +3.3V PCB pad for
proper operation. See Table 2 for shunt positions.
TDM Mode
In TDM mode, the device has a fixed gain of 12dB and the
GAIN_SLOT pin becomes repurposed for slot selection.
The device accepts 8-channel TDM data. The data can
be either 16 bits or 32 bits wide. The GAIN_SLOT pin and
SD_MODE are used to select which of 8 channels of TDM
data the part responds to, as shown in Table 3.
Shutdown Mode
The device features a low-power shutdown mode that is
activated by setting jumper SW1 to pins 2-3. To exit shut-
down mode, set SW1 to pins 1-2 and select the desired
stereo input channel using jumper JU2. See Table 4 for
shunt positions.
Table 1. JU5 Jumper Selection
(GAIN_SLOT)
Table 2. JU2 Jumper Selection
(SD_MODE)
Table 4. SW1 Jumper Selection
*Default position.
*Default position.
*Default position.
Table 3. TDM Mode Channel Selection
(JU2, JU5)
SHUNT
POSITION
GAIN_SLOT
PIN
MAXIMUM
GAIN_SLOT
(dB)
1-2
Connected to VDD through
100kΩ resistor R1
3
1-3 Connected to VDD 6
1-4
Connected to GND through
100kΩ resistor R2
15
1-5* Connected to GND 12
Not
installed
Unconnected 9
SHUNT
POSITION
SD_MODE PIN
AUDIO
CHANNEL
1-2
Connected to VDDIO
through R3 (small resistor)
Right
1-3*
Connected to VDDIO
through a 2kΩ resistor
Left
1-4
Connected to VDDIO
through R4 (large resistor)
Mono mix
(left + right)/2
JU2 JU5 CHANNEL BITS
Connected low X OFF N/A
1-3 1-5 0 16 or 32
1-3 1-3 1 16 or 32
1-3 Open 2 16 or 32
1-3 1-2 3 16 or 32
1-3 1-4 4 16 or 32
1-4 1-5 5 16 or 32
1-4 Open 6 16 or 32
1-4 1-3 7 16 or 32
SWITCH
POSITION
VDDIO
VOLTAGE
DEVICE
OPERATION
1-2*
VDDIO determined
by JU4 jumper
position
Normal
(input channel selected
through JU2 setting)
2-3 Connected to GND Shutdown