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W681512RG 参数 Datasheet PDF下载

W681512RG图片预览
型号: W681512RG
PDF下载: 下载PDF文件 查看货源
内容描述: 单通道语音频带编解码器 [SINGLE-CHANNEL VOICEBAND CODEC]
分类和应用: 解码器编解码器电信电路
文件页数/大小: 38 页 / 317 K
品牌: WINBOND [ WINBOND ]
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W681512  
of this output amplifier can be achieved. If the transmit power amplifier is not in use, it can be powered  
down by connecting PAI to VDD  
.
7.3. POWER MANAGEMENT  
7.3.1. Analog and Digital Supply  
The power supply for the analog and digital parts of the W681512 must be 5V +/- 10%. This supply  
voltage is connected to the VDD pin. The VDD pin needs to be decoupled to ground through a 0.1 μF  
ceramic capacitor.  
7.3.2. Analog Ground Reference Voltage Output  
The analog ground reference voltage is available for external reference at the VAG pin. This voltage  
needs to be decoupled to VSS through a 0.01 μF to a 0.1 μF ceramic capacitor.  
7.4. PCM INTERFACE  
The PCM interface is controlled by pins BCLKR, FSR, BCLKT & FST. The input data is received  
through the PCMR pin and the output data is transmitted through the PCMT pin. The modes of  
operation of the interface are shown in Table 7.3.  
BCLKR  
FSR  
Interface Mode  
64 kHz to 4.096 MHz 8 kHz  
Long or Short Frame Sync  
VSS  
VSS  
VDD  
VDD  
VSS  
VDD  
VSS  
VDD  
ISDN GCI with active channel B1  
ISDN GCI with active channel B2  
ISDN IDL with active channel B1  
ISDN IDL with active channel B2  
Table 7.3 PCM Interface mode selections  
7.4.1. Long Frame Sync  
The Long Frame Sync or Short Frame Sync interface mode can be selected by connecting the  
BCLKR or BCLKT pin to a 64 kHz to 4.096 MHz clock and connecting the FSR or FST pin to the 8  
kHz frame sync. The device synchronizes the data word for the PCM interface and the CODEC  
sample rate on the positive edge of the Frame Sync signal. It recognizes a Long Frame Sync when  
the FST pin is held HIGH for two consecutive falling edges of the bit-clock at the BCLKT pin. The  
length of the Frame Sync pulse can vary from frame to frame, as long as the positive frame sync edge  
occurs every 125 μsec. During data transmission in the Long Frame Sync mode, the transmit data pin  
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