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3. TECHNICAL BRIEF
Figure 3.12.2 Overview of Clocking and Interfaces of Audio Front End
Figure 3.12.2 Overview of Clocking and Interfaces of Audio Front End
The audio front-end of X-GOLD™213 has the following major operation modes:
The audio front-end of X-GOLD™213 has the following major operation modes:
• Power-down: All analog parts are in power down and all clocks of the digital part are switched off.
• Power-down: All analog parts are in power down and all clocks of the digital part are switched off.
• Audio mode: Digital decimation/interpolation filters are connected to the interface buffers and the
• Audio mode: Digital decimation/interpolation filters are connected to the interface buffers and the
analog part is enabled.
analog part is enabled.
These major modes can be modified by certain control register settings.
These major modes can be modified by certain control register settings.
• Due to the new gain settings in the TX path, the maximum input voltage is limited to 0.8 Vpp.
• Due to the new gain settings in the TX path, the maximum input voltage is limited to 0.8 Vpp.
• In both voiceband paths, the value range for voice samples is confined to 97.5%, i.e. to [-31948, 31947] or
• In both voiceband paths, the value range for voice samples is confined to 97.5%, i.e. to [-31948, 31947] or
[8334H, 7CCBH] in X-GOLD™213.
[8334H, 7CCBH] in X-GOLD™213.
• On the TX path, 83% "1"s on the VTPDM line correspond to a 16-bit value of 7CCBH and 17% "1"s
• On the TX path, 83% "1"s on the VTPDM line correspond to a 16-bit value of 7CCBH and 17% "1"s
correspond to a 16-bit value of 8334H at the digital filter output. Thus the usable range is 66%. This range
correspond to a 16-bit value of 8334H at the digital filter output. Thus the usable range is 66%. This range
can be scaled to 100% by Firmware.
can be scaled to 100% by Firmware.
• The high-pass functions of the voiceband filters have to be implemented in firmware on TEAKLite®.
• The high-pass functions of the voiceband filters have to be implemented in firmware on TEAKLite®.
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3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
Only for training and service purposes
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