Datasheet

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SERIAL AUDIO DATA INTERFACE
DATA FORMAT
16-Bit, MSB-First, Left-Justified
BCK
LRCK
Right-ChannelLeft-Channel
DOUT 1
14 15 16321
MSB LSB MSB LSB
14 15 16321
LRCK Right-ChannelLeft-Channel
BCK
DOUT
MSB
LSB
MSB
LSB
16-Bit, MSB-First, I
2
S
FMT = H
14 15 16321 14 15 16321
FMT = L
T0016-03
PCM1801
SBAS131C – OCTOBER 2000 – REVISED JULY 2007
The PCM1801 interfaces the audio system through BCK (pin 6), LRCK (pin 7), and DOUT (pin 8).
The PCM1801 accepts 64-BCK/LRCK, 48-BCK/LRCK (only for a 384-f
S
system clock) or 32-BCK/LRCK format
for the left-justified format. And the PCM1801 accepts the 64-BCK/LRCK or 48-BCK/LRCK format (only for a
384-f
S
system clock) for I
2
S format.
The PCM1801 supports two audio data formats in slave mode, which are selected by the FMT control input
(pin 10) as shown in Table 3 . Figure 25 illustrates the data format. If the application system cannot ensure an
effective system clock prior to power up of the PCM1801, the FMT pin must be held LOW until the power-on
reset sequence is completed. In this case, if the I
2
S format (FMT = HIGH) is required in the application, FMT can
be set HIGH after the power-on reset sequence is completed.
Table 3. Data Format
FMT DATA FORMAT
0 (L) 16-bit, left-justified
1 (H) 16-bit, I
2
S
Figure 25. Audio Data Format
14
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