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W681310R Datasheet(PDF) 8 Page - Winbond |
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W681310R Datasheet(HTML) 8 Page - Winbond |
8 / 38 page W681310 - 8 - 7. FUNCTIONAL DESCRIPTION W681310 is a single-rail, single channel PCM CODEC for voiceband applications. The CODEC complies with the specifications of the ITU-T G.712 recommendation. The CODEC also includes a complete μ-Law and A-Law compander. The μ-Law and A-Law companders are designed to comply with the specifications of the ITU-T G.711 recommendation. The block diagram in section 3 shows the main components of the W681310. The chip consists of a PCM interface, which can process long and short frame sync formats, as well as GCI and IDL formats. The pre-scaler of the chip provides the internal clock signals and synchronizes the CODEC sample rate with the external frame sync frequency. The power conditioning block provides the internal power supply for the digital and the analog section, while the voltage reference block provides a precision analog ground voltage for the analog signal processing. The main CODEC block diagram is shown in section 3. Figure 7.1 The W681310 Signal Path 7.1. Transmit Path The A-to-D path of the CODEC contains an analog input amplifier with externally configurable gain setting (see application examples in section 11). The device has an input operational amplifier whose output is the input to the encoder section. If the input amplifier is not required for operation it can be powered down and bypassed. In that case a single ended input signal can be applied to the AO pin or the AI- pin. The AO pin becomes high input impedance when the input amplifier is powered down. The input amplifier can be powered down by connecting the AI+ pin to VDD or VSS. The AO pin is selected as an input when AI+ is tied to VDD and the AI- pin is selected as an input when AI+ is tied to VSS (see Table 7.1). PAO+ PAO 8 μ/A- Cont AI+ AI - w μ/A- Cont ol AO + RO- - VA G Ant-Aliasi Filter = H Ant i -Aliasi n Filter fC = 200 H High Pas Filt Smoot nFilter 2 H Smoot nFilter 1 8 μ/A Control 8 μ/A- Control PAI VAG Ant-Aliasing Filter - Aliasing Filter Ant- Filter High Pass Filter Smoothing Filter Filter Smoothing Filter Filter Receive Path Transmit Path + - + + + - A/D Converter D/A Converter fC= 3400Hz fC= 3400Hz C = 200Hz f |
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