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The Si3000 is a complete solution for voice I/O such as handsets in MFP
devices. It can be connected directly to any high-speed ISOmodem system-side
chip to support a telephone handset. In this case, an extended AT command set
is available to control the Si3000.
In addition to a codec (A/D, D/A), the device integrates a microphone
preamplifier, 3- input mixer, +12.5 to –34.5 dB of programmable gain,
headphone/speaker driver, and an integrated handset hybrid for direct
connection to a 2-wire telephone handset. Programmable gain and attenuation
settings are available on both the A/D converter and the D/A converter signal
paths with 1.5 dB step resolution. Programmable gain/attenuation is
implemented using a zero crossing technique to enable “click-free” level
transitions. Operation from a single +5 V or a single +3.3 V power supply
makes the device suitable for low power portable applications.
Si3000 Block Diagram
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