MAX98372 Datasheet, PDF (43/91 Pages) Maxim Integrated Products – Digital Input Class D Amplifier with DHT and Brownout Protection

MAX98372
Digital Input Class D Amplifier
with DHT and Brownout Protection
Interface Format
The MAX98372 supports standard I²S, left-justified, and
TDM data formats. I²S and left-justified formats support
two audio channels of 16-, 24- or 32-bit depth. TDM
supports up to 16 audio channels of 16-, 24-, or 32-bit
depth. The IC supports slave operation only, and the
LRCLK and BCLK pins operate as inputs.
I²S (Figure 5) and left-justified (Figure 6) modes configure
the LRCLK signal to transition before each channel. With
the default I²S settings LRCLK low indicates left channel
while LRCLK high indicates the right channel. The MSB
of the audio word is latched on the second active BCLK
edge after an LRCLK transition. In left-justified mode, the
MSB of the audio word is latched on the first active BCLK
edge after an LRCLK transition.
TDM mode (Figure 7) uses a frame sync pulse instead
of a 50% duty cycle frame clock. The frame sync pulse
(applied to the LRCLK pin) is equal to one BCLK period
as a minimum, although the interface operates with longer
periods; the rising edge of LRCLK is used to indicate
the start of a new frame. The falling edge can occur at
any time as long as it does not violate the setup time
requirements of the LRCLK rising edge. In TDM, latch the
MSB of the first audio word on the first or second active
BCLK edge after an LRCLK rising edge.
Configuring the DAI Format
Specify the format by configuring the LRCLK invert, BCLK
active edge, data delay, and TDM mode configuration bits
(Table 6).
Table 6. Configuration for Digital Audio Interface Format
ADDRESS BIT
NAME
DESCRIPTION
7
Configures Channel Word Length
CHANSZ[1:0]
00: 8 bits
10: 24 bits
6
01: 16 bits
11: 32 bits
5
4
3
0x14
2
1
FORMAT[2:0]
BCLEDGE
CHANSEL
PCM Format Select
000: I²S mode
001: Left-justified
010: Right-justified
011: TDM mode 1
100: TDM mode 2
101–111: Reserved
Active BCLK Edge Select
0: Data captured and valid on rising edge of BCLK
1: Data captured and valid on the falling edge of BCLK
Non-TDM LRCLK Starting Edge
0: Falling LRCLK indicates the start of a stereo pair. Channel 0 when
LRCLK is low, channel 1 when LRCLK is high.
1: Rising LRCLK indicates the start of a stereo pair. Channel 0 when
LRCLK is high, channel 1 when LRCLK is low.
0
0
0
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