3222/3223-DB1 Silicon Laboratories Inc, 3222/3223-DB1 Datasheet - Page 23

• Manufacturer Part Number: 3222/3223-DB1
• Description: EVAL BOARD FOR IA3222/3223
• Manufacturer: Silicon Laboratories Inc
• Series: EZ DAA™r

Specifications of 3222/3223-DB1

• Main Purpose: Telecom, Data Acquisition Arrangement (DAA)
• Embedded: Yes, FPGA / CPLD
• Utilized Ic / Part: IA3222, IA3223
• Primary Attributes: -
• Secondary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

IA3222/23
4. Overview
The chipset provides 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 isolation bridge technology eliminates the
need for costly and bulky transformers yet still ensures a high level of isolation between the phone line and the
system side.
4.1. 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 an interface with or without coupling capacitors. Refer to the applications section
below for more details.
4.2. 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 1000 to 3000VAC.
The chipset implements a high-voltage isolation barrier between the IA3223 codec and its IA3222 line-side device
by means of its patented isolation bridge technology. Where typical designs use costly transformers or
optocouplers, isolation bridge reduces the total bill of materials cost by embedding high-voltage capacitors in the
PCB. This unique technique allows for virtually zero-cost capacitors.
PCB board material, thickness, trace width, and pad dimensions determine the capacitance achieved by this
technique. The IA3222/IA3223 requires three 0.7 pF (nominal) capacitors and is designed to operate over the wide
variations seen in standard PCB materials.
The application requires three PCB capacitors whose diameters range typically from 140 to 190 mils depending on
the thickness of the board.
4.3. International Compliance
The chipset can be programmed to meet the variety of telecommunication requirements and standards worldwide
through the serial loading of two registers.
4.4. Serial Interface
The IA3222/IA3223 can be programmed using a simple asynchronous serial protocol independent of the audio
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.
Rev. 5.0
23