参数资料
型号: PCM1792DBRG4
厂商: Texas Instruments
文件页数: 9/61页
文件大小: 0K
描述: IC DAC 24BIT STER 192KHZ 28-SSOP
产品培训模块: Data Converter Basics
标准包装: 2,000
位数: 24
数据接口: I²C,串行,SPI?
转换器数目: 2
电压电源: 模拟和数字
工作温度: -25°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
供应商设备封装: 28-SSOP
包装: 带卷 (TR)
输出数目和类型: 2 电压,单极
采样率(每秒): 200k
PCM1792
SLES069B MARCH 2003 REVISED NOVEMBER 2006
www.ti.com
17
AUDIO DATA INTERFACE
Audio Serial Interface
The audio interface port is a 3-wire serial port. It includes LRCK (pin 4), BCK (pin 6), and DATA (pin 5). BCK is the
serial audio bit clock, and it is used to clock the serial data present on DATA into the serial shift register of the audio
interface. Serial data is clocked into the PCM1792 on the rising edge of BCK. LRCK is the serial audio left/right word
clock.
The PCM1792 requires the synchronization of LRCK and system clock, but does not need a specific phase relation
between LRCK and system clock.
If the relationship between LRCK and system clock changes more than
±6 BCK, internal operation is initialized within
1/fS and analog outputs are forced to the bipolar zero level until resynchronization between LRCK and system clock
is completed.
PCM Audio Data Formats and Timing
The PCM1792 supports industry-standard audio data formats, including standard right-justified, I2S, and
left-justified. The data formats are shown in Figure 28. Data formats are selected using the format bits, FMT[2:0],
in control register 18. The default data format is 24-bit I2S. All formats require binary 2s complement, MSB-first audio
data. Figure 27 shows a detailed timing diagram for the serial audio interface.
DATA
t(BCH)
50% of VDD
BCK
LRCK
t(BCL)
t(LB)
t(BCY)
t(DS)
t(DH)
50% of VDD
t(BL)
PARAMETERS
MIN
MAX
UNITS
t(BCY)
BCK pulse cycle time
70
ns
t(BCL)
BCK pulse duration, LOW
30
ns
t(BCH)
BCK pulse duration, HIGH
30
ns
t(BL)
BCK rising edge to LRCK edge
10
ns
t(LB)
LRCK edge to BCK rising edge
10
ns
t(DS)
DATA setup time
10
ns
t(DH)
DATA hold time
10
ns
LRCK clock duty
50%
± 2 bit clocks
Figure 27. Timing of Audio Interface
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