CM108AH Datasheet, PDF (8/27 Pages) C-Media Electronics – Highly Integrated USB Audio I/O Controller

CM108AH
Highly Integrated USB Audio I/O Controller
4 I²S Interface
The
CM108AH
provides
an
I S²
P
P
interface
for
both
playback
and
recording.
External
ADC,
DAC,
or
DSP
can
be
added to provide additional functions within the USB audio system. The CM108AH sends out master clock (fixed
at x256), LRCK (fixed at x64), and data clock data. Therefore, external ADCs, DACs, or DSPs should be set to
slave mode.
The
left
channel
of
the
CM108AH’s
I S²
P
P
bus
is
used
for
mono
recording.
Both
I S²
P
P
buses
use
a
5V
tolerant
pad
in
order
to
easily
interface
with
5V
or
3.3V
devices.
Playback
data
is
simultaneously
sent
to
both
the
DAC
and
I S²
P
P
bus.
The
recording
source
(ADC
or
I S²
P
P
bus)
can
be
selected
by
ADSEL
jumper
pin.
LRCK
SCLK
SDATA
Left Channel
MSB -1
-2
+2 +1 LSB
Right Channel
MSB -1
-2
+2 +1 LSB
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Rev. 2.1︱ Page 8/27