– 5–11 –
Figure 5.10. AD6521 Functional Block Diagram
The microphone is a noise canceling type to provide improved speech pick-up, noise immunity
and reduced echo. The GSM standard requires that when in handheld mode, the transmitter audio
frequency response must fit within the mask shown below:
Figure 5.11. Handheld GSM Transmit Audio Frequency Response Mask
5.3.2. Microphone
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Individual Power Management Features
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Baseband, Voiceband and Auxiliary Serial Ports
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JTAG Interface
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Optimized Low-Power Converter Design
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Low 1.6V Digital Supply Operation
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Variable Digital Interface Supply
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Low 2.4V Analog Supply Operation