W6811 Datasheet, PDF (11/37 Pages) Winbond – SINGLE-CHANNEL VOICEBAND CODEC

W6811
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 V_DDA pin. The V_DDA 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 V_DDD pin. The V_DDD 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 V_SSA at the V_REF 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 V_AG pin. This voltage
needs to be decoupled to V_SSA through a 0.01 µF ceramic capacitor. The analog ground reference
voltage is generated from the voltage on the V_REF 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 8 kHz
MHz
Long or Short Frame Sync
V_SSD
V_SSD
V_DDD
V_DDD
V_SSD
ISDN GCI with active channel B1
V_DDD
ISDN GCI with active channel B2
V_SSD
ISDN IDL with active channel B1
V_DDD
ISDN IDL with active channel B2
Table 7.3 PCM Interface mode selections
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Publication Release Date: October 23, 2003
Revision A10