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WM8716 Datasheet(PDF) 10 Page - Wolfson Microelectronics plc

No. de pieza WM8716
Descripción Electrónicos  High Performance 24-bit, 192kHz Stereo DAC
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Fabricante Electrónico  WOLFSON [Wolfson Microelectronics plc]
Página de inicio  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8716 Datasheet(HTML) 10 Page - Wolfson Microelectronics plc

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WM8716
Production Data
w
PD, Rev 4.2,August 2008
10
AUDIO DATA INTERFACE
Data may be input at a rate corresponding to the system clock having a rate of 256fs or 384fs or
512fs or 768fs, in which case an oversampling ratio of 128x is selected. Alternatively a rate of 128fs
or 192fs may be used, in which case the first filter stage is bypassed and an oversampling ratio of
64x results. Finally, in MODE8X, data may be input at 8x the normal rate, in which case separate
input pins are used to input the two stereo channels of data (unless DIFFHW mode and MODE8X
are both selected, in which case only a mono channel is converted differentially). In MODE8X all filter
stages are by-passed, prior to the sigma delta modulator. Data is input MSB first in all modes.
NORMAL SAMPLE RATE
In normal mode, the data is input serially on one pin for both left and right channels.
Data can be “right justified” meaning that the last 16, 20 or 24 bits (depending on chosen PCM word
length) that were clocked in prior to the transition on LRCIN are valid.
Alternatively data can be “left justified” (20 and 24-bit PCM data only), where the bits are clocked in
as the first 20 or 24 bits after a transition on LRCIN.
For the three I2S modes supported (16-bit, 20-bit and 24-bit PCM data), data is clocked “left justified”
except with one additional preceding clock cycle.
LRCIN (PIN 1)
16-BIT RIGHT
JUSTIFIED
DIN (PIN 2)
20-BIT RIGHT
JUSTIFIED
DIN (PIN 2)
24-BIT RIGHT
JUSTIFIED
DIN (PIN 2)
24-BIT LEFT
JUSTIFIED
DIN (PIN 2)
20-BIT LEFT
JUSTIFIED
DIN (PIN 2)
BCKIN (PIN 3)
B2 B1 B0
B2 B1 B0
B2 B1
B0
B0
B0
B23 B22 B21
B19 B18 B17
B23 B22 B21 B20 B19
B4 B3 B2 B1 B0
B0
B19 B18 B17
B15
B2 B1 B0
B2 B1 B0
B2 B1 B0
B23 B22 B21
B19 B18 B17
B0
B4 B3 B2 B1 B0
B23 B22 B21 B20 B19
B19 B18 B17
B15
B2 B1 B0
B2 B1 B0
B2 B1 B0
RIGHT
LEFT
1/fs
LRCIN (PIN 1)
16-BIT I2S
DIN (PIN 2)
24-BIT I2S
DIN (PIN 2)
20-BIT I2S
DIN (PIN 2)
BCKIN (PIN 3)
B2
B1 B0
B0
B2 B1 B0
B3 B2 B1
RIGHT
LEFT
B15
B23
B19
B6
B5 B4
B2
B1 B0
B3 B2 B1
B15
B23
B19
B6 B5 B4
B0
B2 B1 B0
B23
B19
B15
Figure 4 Audio Data Input Format


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