参数资料
型号: W6811ISG
厂商: WINBOND ELECTRONICS CORP
元件分类: 编解码器
英文描述: A/MU-LAW, PCM CODEC, PDSO24
封装: 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOP-24
文件页数: 2/37页
文件大小: 589K
代理商: W6811ISG
W6811
Publication Release Date: September, 2005
- 10 -
Revision A12
7.3. POWER MANAGEMENT
7.3.1. Analog Supply
The power supply for the analog part of the W6811 needs to be 5V +/- 10%. This supply voltage is
connected to the VDDA pin. The VDDA pin needs to be decoupled to ground through a 0.1 μF ceramic
capacitor.
7.3.2. Digital Supply
The power supply for the digital part of the W6811 needs to be 3V +/- 10%. This supply voltage is
connected to the VDDD pin. The VDDD pin needs to be decoupled to ground through a 0.1 μF ceramic
capacitor.
7.3.3. Analog Ground Reference Bypass
The system has an internal precision voltage reference which generates the 2.5V mid-supply analog
ground voltage. This voltage needs to be decoupled to VSSA at the VREF pin through a 0.1 μF ceramic
capacitor.
7.3.4. 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 VSSA through a 0.01 μF ceramic capacitor. The analog ground reference
voltage is generated from the voltage on the VREF pin and is also used for the internal signal
processing.
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
VSSD
ISDN GCI with active channel B1
VSSD
VDDD
ISDN GCI with active channel B2
VDDD
VSSD
ISDN IDL with active channel B1
VDDD
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
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