cs5331a Cirrus Logic, Inc., cs5331a Datasheet - Page 10

• Manufacturer Part Number: cs5331a
• Description: 8-pin, Stereo A/d Converter For Digital Audio
• Manufacturer: Cirrus Logic, Inc.

10
3.1.4
3.1.5
3.1.6
LRCK
SCLK
SDATA
LRCK
SCLK
SDATA
Slave Mode
LRCK and SCLK become inputs in SLAVE mode. LRCK must be externally derived from MCLK and be
equal to Fs. The frequency of SCLK should be equal to 64x LRCK, though other frequencies are possible.
MCLK frequencies of 256x, 384x, and 512x Fs are supported. The ratio of the applied MCLK to LRCK is
automatically detected during power-up and internal dividers are set to generate the ap-propriate internal
clocks.
CS5330A
The CS5330A data output format is shown in
LRCK and the remaining seventeen data bits are clocked by the falling edge of SCLK. The data bits are
valid during the rising edge of SCLK.
CS5331A
The CS5331A data output format is shown in
LRCK transitions and the MSB of the data. The falling edges of SCLK cause the ADC to output the eigh-
teen data bits. The data bits are valid during the rising edge of SCLK. LRCK is also inverted compared to
the CS5330A interface. The CS5331A interface is compatible with I
0
17 16
0
Left Audio Data
1
1
17 16
Left Audio Data
2
2
3
1
17
0
1
Figure 3. Data Output Timing - CS5331A (I²S Compatible)
18 19 20 21
18 19 20 21 22
0
Figure 2. Data Output Timing-CS5330A
22
30
30
31
31
Figure
Figure
0
0
17 16
Right Audio Data
2. Notice that the MSB is clocked by the transition of
1
1
3. Notice the one SCLK period delay be-tween the
17 16
Right Audio Data
2
2
3
1
17
1
0
18 19 20 21 22 23
18 19 20 21
2
0
S.
22 23
CS5330A/31A
31
31
0
DS138F5
0
1
1