參數(shù)資料
型號(hào): SRC4190
英文描述: 192kHz Stereo Asynchronous Sample Rate Converters
中文描述: 192kHz立體聲異步采樣速率轉(zhuǎn)換器
文件頁(yè)數(shù): 18/25頁(yè)
文件大?。?/td> 1108K
代理商: SRC4190
SRC4190
SBFS023A
18
www.ti.com
OUTPUT PORT OPERATION
The audio output port is a four-wire synchronous serial
interface that may operate in either Slave or Master mode.
The SDOUT output (pin 23) is the serial audio data output.
Audio data is output at this pin in one of four data formats:
Philips I
2
S, Left Justified, Right Justified, or TDM. The audio
data word length may be 16-, 18-, 20-, or 24-bits. For all word
lengths, the data is triangular PDF dithered from the internal
28-bit data path. The data formats (with the exception of
TDM mode) are shown in Figure 6, while critical timing
parameters are shown in Figure 7 and listed in the Electrical
Characteristics table. The TDM format and timing are shown
in Figures 11 and 12, respectively, while examples of stan-
dard TDM configurations are shown in Figures 13 and 14.
The bit clock is either input or output at BCKO (pin 25). In
Slave mode, BCKO is configured as an input pin, and may
operate at rates from 32f
S
to 128f
S
, with a minimum of one
clock cycle for each data bit. The exception is the TDM
mode, where the BCKO must operate at N x 64f
S
, where N
is equal to the number of SRC4190 devices included on the
TDM interface. In Master mode, BCKO operates at a fixed
rate of 64f
S
for all data formats except TDM, where BCKO
operates at the reference clock (RCKI) frequency. Additional
information regarding TDM mode operation is included in the
Applications Information section of this data sheet.
The left/right word clock, LRCKO (pin 24), may be configured
as an input or output pin. In Slave mode, LRCKO is an input
pin, while in Master mode it is an output pin. In either case,
the clock rate is equal to f
S
, the output sampling frequency.
The clock duty cycle is fixed to 50% for I
2
S, Left Justified, and
Right Justified formats in Master mode. The LRCKO pulse
width is fixed to 32 BCKO cycles for the TDM format in
Master mode.
Left Channel
(a) Left Justified Data Format
(b) Right Justified Data Format
Right Channel
LRCKO
BCKO
SDOUT
MSB
LSB
LSB
MSB
LRCKO
BCKO
SDOUT
MSB
MSB
LSB
LSB
(c) I
2
S Data Format
1/f
S
LRCKO
BCKO
SDOUT
MSB
LSB
MSB
LSB
t
SOH
t
DOPD
t
SOL
t
DOH
LRCKO
BCKO
SDOUT
FIGURE 6. Output Data Formats.
FIGURE 7. Output Port Timing.
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