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參數(shù)資料
| 型號(hào)： | PCM1739 |
| 英文描述： | 24-Bit, 192kHz Sampling, Enhanced Multi-Level, Delta-Sigma, Audio DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 24位192kHz采樣，增強(qiáng)的多級(jí)，Δ-Σ，音頻數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大?。?/td> | 140K |
| 代理商： | PCM1739 |
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9
PCM1739
FIGURE 2. Power-On Reset Timing.
FIGURE 3. External Reset Timing.
AUDIO SERIAL INTERFACE
The audio serial interface for the PCM1739 is comprised
of a 3-wire synchronous serial port. It includes LRCK (pin
1), BCLK (pin 3), and DATA (pin 2). BCLK is the serial
audio bit clock, and is used to clock the serial data present
on DATA into the audio interface’s serial shift registers.
Serial data is clocked into the PCM1739 on the rising edge
of BCLK. LRCK is the serial audio left/right word clock.
It is used to latch serial data into the serial audio interface’s
internal registers.
Both LRCK and BCLK must be synchronous to the system
clock. Ideally, it is recommended that LRCK and BCLK
be derived from the system clock input or output, SCLK or
CLKO. The left/right clock, LRCK, is operated at the
sampling frequency (f
S
). The bit clock, BCK, may be
operated at 48 or 64 times the sampling frequency.
AUDIO DATA FORMATS AND TIMING
The PCM1739 supports industry-standard audio data for-
mats, including Standard and I
2
S. The audio data word
length may be either 24 or 16 bits. Data format and word
length are selected using the FORM and IBIT pins, as
described in the Mode Controls section of this data sheet.
All formats require Binary Two’s Complement, MSB-first
audio data. The data formats are shown in Figure 4, while
Figure 5 shows a detailed timing diagram for the serial
audio interface.
MODE CONTROLS
This section describes the mode control pins used to configure
the operating mode of the PCM1739.
AUDIO DATA FORMAT
The data format used by the audio serial interface is selected
using the FORM input (pin 28). The formats available
include Standard and I
2
S. Table II shows the FORM pin
configuration.
TABLE II. Audio Data Format Selection.
FORM
DATA FORMAT
L
H
Standard
I
2
S
AUDIO DATA WORD LENGTH
The data word length used by the audio serial interface is
selected using the IBIT input (pin 9). The word length may
be either 24 or 16 bits. Table III shows the IBIT pin
configuration.
IBIT
DATA WORD LENGTH
L
H
24 Bits
16 Bits
TABLE III. Audio Data Word Length Selection.
1024 system clocks
Reset
Reset Removal
V
CC
= V
DD
Internal Reset
2.4V
2.0V
1.6V
System Clock
(SCLK)
1024 system clocks
Reset
Reset Removal
System Clock
(SCLK)
Internal Reset
RSTB
t
RST(1)
NOTE: (1) t
RST
= 20ns min.
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