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W681310 Datasheet(PDF) 10 Page - Winbond |
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W681310 Datasheet(HTML) 10 Page - Winbond |
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10 / 38 page  W681310 - 10 - 7.3.1. Analog and Digital Supply The power supply for the analog and digital parts of the W681310 must be 2.7V to 5.25V. 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 Bypass The system has an internal precision voltage reference which generates the VDD/2 mid-supply analog ground voltage. This voltage needs to be decoupled to VSS at the VREF pin through a 0.1 μF ceramic capacitor. 7.3.3. Analog Ground Reference Voltage Outpt 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 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 4.800 MHz 8 kHz Long or Short Frame Sync VSS VSS ISDN GCI with active channel B1 VSS VDD ISDN GCI with active channel B2 VDD VSS ISDN IDL with active channel B1 VDD VDD ISDN IDL with active channel B2 Table 7.3 PCM Interface mode selections |
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