IA3222B-F-FTR Silicon Laboratories Inc, IA3222B-F-FTR Datasheet - Page 5

• Manufacturer Part Number: IA3222B-F-FTR
• Description: IC EZ DAA LINE SIDE WORLD 10MSOP
• Manufacturer: Silicon Laboratories Inc
• Series: EZ DAA™r

Specifications of IA3222B-F-FTR

• Function: Data Access Arrangement (DAA)
• Interface: Serial
• Number Of Circuits: 1
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Supply: 7.9mA
• Power (watts): 2W
• Operating Temperature: -25°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Includes: "911" Detection, Line-In-Use Detection, Parallel Pick-Up Detection, Ring Detection
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

OVERVIEW
The chipset provides, in an integrated solution, a low-cost
worldwide compliant telephone line interface. Due to its high
level of integration, only a few external components are
required for operation. Its patented IsoBridge
eliminates the need for costly and bulky transformers, yet still
insuring a high level of isolation between the phone line and
the system side.
Analog Interface
The DAA is easily interfaced using single-ended transmitters
and receivers. An extra input pin can be used to set the DC
reference, thus facilitating the interfacing with or without
coupling capacitors. Refer to the applications section below for
more details.
Isolation Barrier
In most cases, equipment meant to be connected to the Public
Switch Telephone Network must comply with specific safety
requirements, including the implementation of a high-voltage
isolation barrier between the telephone line side and the
system side. Various standards require the isolation barrier to
withstand from 1000V
high-voltage isolation barrier between the IA3223 codec and its
IA3222 line-side device by means of its patented IsoBridge
technology. Where typical designs use costly transformers,
optocouplers or discrete high voltage capacitors, IsoBridge
reduces the Bill of Materials total cost by embedding high
voltage capacitors into the PCB. This unique technique allows
for virtually zero-cost capacitors.
PCB board material and thickness, trace width and pads
dimensions determine the capacitance achieved by this
technique. The IA3222/IA3223 requires three 0.7pF (nominal)
capacitors to operate. The chipset is designed to operate over
the wide variation range seen in standard PCB materials.
The application requires only three PCB capacitors, whose
diameters range typically from 140 to 190 mils, depending on
the thickness of the board.
International Compliance
The chipset can be programmed to meet all the variety of
telecommunication requirements and standards worldwide
through the serial loading of two registers.
PCB board
Bottom layer
AC
IsoBridge Cap
to 3000V
TM
AC
. The chipset implements a
Top layer
™
technology
Serial Interface
The IA3222/IA3223 can be programmed using a simple
asynchronous serial protocol. Programming the DAA registers is
asynchronous and independent of the data path.
When CS# is low (active), the first clock rising edge latches the
read or write command. The next three clock edges latch a
three-bit register address. The next four clock rising edges
serially shift a four-bit data word in, or the next four clock falling
edges serially shift a four-bit data word out, depending on the
status of the read/write command. Refer to the timing
diagrams in the specification section for more details on the
serial interface.
International Programming Sequence
International programming options are loaded into the System
Side and updated to the line side upon three possible events:
• Upon register loading if the line side is in the off-hook state
• When the line side is made to go off hook
• When the line side recovers from a line interruption
Hook control
The DAA is set on hook and off hook by writing a bit in a register
through the serial interface.
Line Overload Protection
The chipset provides a built-in line-overload protection circuit to
protect the IA3222 line-side device from unusual telephone
line conditions, which could result in excessive voltage or
current conditions. If the IA3222 senses an excessive line
voltage (about 100V) when on hook, it will not go off hook even
when an off-hook state is set in the control register. If the
IA3222 senses an excessive loop current (about 170mA) when
off hook, it will immediately go on hook. This will result in
oscillation since in this case the IA3222 still sees an off-hook
command and therefore keeps trying to go back off hook. While
a fault condition exists, the LD status bit is high.
DC Termination (Voltage Drop vs. Loop Current)
The chipset offers four main DC termination modes and line-
current limiting support specific for legacy TBR21 countries.
Since TBR21 has been superseded by ES 203 021, European
countries no longer rely on current limitation. While the
IA3222/3223 chipset supports this mode for the few
remaining countries that may still require current limiting, this
requirement is expected to disappear rapidly. The four main DC
headroom modes ensure that any country voltage-drop
requirement can be met. The maximum transmitted level is
different for each setting.
IA3222/IA3223
5