参数资料
型号: PCM1792DBRG4
厂商: Texas Instruments
文件页数: 33/61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
39
Application for Interfacing With an External Digital Filter
For some applications, it may be desirable to use an external digital filter to perform the interpolation function, as it
can provide improved stop-band attenuation when compared to the internal digital filter of the PCM1792.
The PCM1792 supports several external digital filters, including:
D Texas Instruments DF1704 and DF1706
D Pacific Microsonics PMD200 HDCD filter/decoder IC
D Programmable digital signal processors
The external digital filter application mode is accessed by programming the following bits in the corresponding control
register:
D DFTH = 1 (register 20)
The pins used to provide the serial interface for the external digital filter are shown in the connection diagram of
Figure 40. The word (WDCK) signal must be operated at 8
× or 4× the desired sampling frequency, fS.
System Clock (SCK) and Interface Timing
The PCM1792 in an application using an external digital filter requires the synchronization of WDCK and the system
clock. The system clock is phase-free with respect to WDCK. Interface timing among WDCK, BCK, DATAL, and
DATAR is shown in Figure 42.
Audio Format
The PCM1792 in the external digital filter interface mode supports right-justified audio formats including 16-bit, 20-bit,
and 24-bit audio data, as shown in Figure 41. The audio format is selected by the FMT[2:0] bits of control register
18.
MSB
LSB
16
BCK
DATA
1/4 fS or 1/8 fS
DATA
WDCK
Audio Data Word = 16-Bit
Audio Data Word = 20-Bit
Audio Data Word = 24-Bit
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15
16
15
MSB
LSB
16
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15
20
19
20
17 18 19
MSB
LSB
16
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15
24
23
20
17 18 19
24
21 22 23
Figure 41. Audio Data Input Format for External Digital Filter (Internal DF Bypass Mode) Application
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