Datasheet

MAX98357A/MAX98357B
PCM Input Class D Audio Power Amplifiers
15Maxim Integrated
Pin Description
Pin Configurations
PIN
NAME FUNCTION
WLP TQFN
A1 4
SD_MODE
Shutdown and Channel Select. Pull SD_MODE low to place the device in shutdown. In I
2
S
or LJ mode, SD_MODE selects the data channel (Table 5). In TDM mode, SD_MODE and
GAIN_SLOT are both used for channel selection (Table 7).
A2 7, 8 V
DD
Power-Supply Input
A3 9 OUTP Positive Speaker Amplifier Output
B1 1 DIN Digital Input Signal
B2 2
GAIN_
SLOT
Gain and Channel Selection. In I
2
S and LJ mode determines amplifier output gain (Table 8)
In TDM mode, used for channel selection with SD_MODE (Table 7). In TDM mode, gain is
fixed at 12dB.
B3 10 OUTN Negative Speaker Amplifier Output
C1 16 BCLK Bit Clock Input
C2 3, 11, 15 GND Ground
C3 14 LRCLK Frame Clock. Left/right clock for I
2
S and LJ mode. Sync clock for TDM mode.
—
5, 6,
12, 13
N.C. No Connection
— — EP
Exposed Pad. The exposed pad is not internally connected. Connect the exposed page to a
solid ground plane for thermal dissipation.
WLP
TOP VIEW
BUMP SIDE DOWN
GNDBCLK LRCLK
GAIN_SLOTDIN OUTN
V
DD
SD_MODE OUTP
MAX98357A
MAX98357B
+
A1
B1
C1 C2 C3
B2 B3
A3A2
15
16
14
13
5
6
7
GND
SD_MODE
8
DIN
OUTN OUTP N.C.
13
LRCLK
4
12 10 9
GND
BCLK
V
DD
V
DD
N.C.
N.C.
GAIN_SLOT GND
2
11
N.C.
TQFN
MAX98357A
MAX98357B
TOP VIEW
+