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The Si3044 is an integrated silicon Direct Access Arrangement (DAA) that
offers global compliance through a programmable telephone line interface.
A digital synchronous serial interface is provided to connect to a wide
variety of DSPs and host processors. The chipset is fully programmable for AC
and DC termination, ringer impedance and ringer threshold, and the device
supports billing tone detection, polarity reversal and pulse dialing enabling
it to meet the most stringent global PTT requirements. The Si3044 offers a
number of new features, including line voltage monitoring (up to 72 V in 2.25
V/bit resolution), parallel phone operation, higher transmit/receive levels
(up to +3.2 dBm) and lower telephone line current consumption in on-hook line
monitor (caller ID) mode.
Characteristic of Silicon Laboratories' DAA products, the Si3044 offers the
highest level of integration by replacing the codec, isolation transformer,
relays, opto-isolators, 2–4 wire hybrid and DC holding circuit with two 16-pin
small outline SOIC packages. The Si3044 is pin-compatible with the Si3034
global DAA and Si3035 FCC/Japan DAA.
Si3044 Block Diagram
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