Features

• Enables system designers to comply with:

 CISPR22 and FCC Part 15, Class B

requirements for Radiated and Conducted

Emissions

 IEC 61000-4-3 requirements for Radiated and

Conducted Immunity, Level 3 or higher

 IEC 61000-4-2 ESD (Air Discharge) of ±25kV

 IEC 61000-4-2 ESD (Contact Discharge) of

±12kV

 Cable Discharge Event (CDE) of ±12kV

• Provides up to 10dB of additional common

mode noise suppression over the frequency of

1MHz to 125MHz when used with Ethernet

magnetics

• Robust built-in ESD suppressors protect the

Ethernet PHY and improve system ESD

performance

• JESD22-A114, ESD, HBM of ±8kV

• Interfaces to standard Ethernet transformers

and 10/100/1000 Ethernet PHYs

• Uses a single standard power rail (3.3V or 2.5V)

• Open drain output stage that can be biased

from 1.8V to 3.3V using transformer center-tap

supply as needed based on choice of Ethernet

PHY.

• Flow-through routing for ease of board layout

• Typical power consumption of 90mW.

• Low power mode available

• Industrial temperature range (-40°C to +85°C)

Applications

• Ethernet systems requiring additional CM

suppression to meet EMC Class B emissions or

higher EMI immunity requirements and ESD

protection

• PoE and Non-PoE Ethernet systems

• VoIP Phones, IP Cameras, WAPs, Routers,

Switches

• Set Top Boxes, Networked Printers and

Appliances, Desktop and Laptop Computers

Brief Description

The KTA1550 is a single-chip, highly integrated CMOS

solution for Common Mode (CM) noise suppression &

transient voltage protection in Ethernet applications.

The KTA1550 EMI/ESD Suppressor has been architected

and designed to provide system level ESD protection and

EMI suppression in Ethernet products, enabling an easier

path to system EMC compliance.

The KTA1550 utilizes Kinetic Technologies’ patented

Active Choke technology which offers superior Common

Mode reduction and immunity compared to passive filtering

techniques in Ethernet applications. The adaptive and

continuous suppression operates over the entire Ethernet

signal bandwidth, and it compensates for many variables

that are the source of common mode noise in Ethernet

systems. It also improves the differential-to-common mode

balance of the system. This enables system designers to

meet EMI emissions and EMI immunity requirements from

the start of the design.

In addition, the KTA1550 includes highly robust ESD/Surge

protection diodes to protect the Ethernet PHY from various

transient overvoltage events. These are built using

Kinetics' proprietary design and layout techniques to safely

deal with very high current densities in a CMOS process

without creating voltage and/or thermal overstress that

causes damage to the device.

Each KTA1550 supports two twisted pair interfaces.

10/100 applications require one KTA1550 device while

10/100/1000 applications require two KTA1550 devices.

The KTA1550 is available in a small footprint 16-pin QSOP

or 16-pin TDFN 4mm x 2.5mm Reduction of Hazardous

Substance (RoHS) compliant package.