ia3222 integration, ia3222 Datasheet - Page 6

• Manufacturer Part Number: ia3222
• Description: Ia3222/ia3223 Ez Daa? Chipset With Analog Interface
• Manufacturer: integration

AC Termination (Line Impedance Matching)
The chipset offers several different AC impedance terminations
selectable through the serial port. These AC impedances can
be combined with any DC termination selected to address a
country’s loop or trunk interface requirements. Refer to the
section “Return Loss and Trans-Hybrid Return Loss” for more
details.
DTMF Dialing
DTMF dialing is synthesized and generated by the application;
only a few parameters in the IA3223, such as the gain and
maximum transmission level, need to be set prior to dialing.
Pulse Dialing
Pulse dialing is accomplished by going on hook and off hook
repeatedly to generate the make and break pulses. It is the
system application’s responsibility to implement the different
timings related to the pulse dialing specification, such as
make/break times and ratio, inter-digit pause and pulses per
second settings depending on the intended country ‘s
specification. The IA3222 meets pulse-dialing overshoot
requirements on inductive lines for Australia and a few other
countries.
Caller ID
When the device is on hook, the Caller ID audio signal is
available at the receiver output pin of the IA3223. This function
is achieved while maintaining the high on-hook impedance
required by telecom regulations. The gain can be set high (0
dB) for normal operation or low (-6 dB) for DTMF monitoring.
Power-Down Mode
In order to reduce power consumption, it is possible to set the
IA3223 to power-down mode. In this state the device may not
go off hook or monitor the line.
IA3222/IA3223
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