参数资料
型号: WLA49VVA
厂商: National Semiconductor Corporation
元件分类: ADC
英文描述: Audio Sub-System with Dual-Mode Stereo Headphone and Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose ADC
中文描述: 音频子系统的双模单声道立体声耳机和扬声器放大器的高效率和多功能模数转换器
文件页数: 30/112页
文件大小: 5017K
代理商: WLA49VVA
12.0 Status & Control Registers (Continued)
12.4 COMMON CLOCK SETTINGS FOR THE DAC & ADC
The DAC has an over sampling rate of 125 but requires a 250*fs clock at point B. This allows a simple clocking solution as it will
work from 12.000 MHz (common in most systems with Bluetooth or USB) at 48 kHz exactly, the following table describes the clock
required at point B for various clock sample rates in the different DAC modes:
TABLE 4. Common DAC Clock Frequencies
DAC Sample Rate (kHz)
Clock Required at B (MHz)
82
11.025
2.75625
12
3
16
4
22.05
5.5125
24
6
32
8
44.1
11.025
48
12
The ADC has an over sampling ratio of 125 so the table below shows the required clock frequency at point C.
TABLE 5. Common ADC Clock Frequencies
ADC Sample Rate (kHz)
Clock Required at C (MHz)
81
11.025
1.378125
12
1.5
16
2
22.05
2.75625
24
3
Methods for producing these clock frequencies are described in the PLL Section.
LM4935
www.national.com
24
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