The AS1138 is a single-chip, highly integrated CMOS solution

for Power over Ethernet (PoE) Powered Devices requiring input

power of up to 30Watts. Applications include Voice over IP

(VoIP) Phones, Wireless LAN Access Point, Security Cameras,

WiMax Terminals, Point-of-Sales Terminals, RFID Readers,

Thin Clients and Notebook computers.

The AS1138 integrates input surge protection, a PD controller

and a low-emission DC-DC controller. The AS1138 implements

all of the physical layer Powered Device (PD) functionality, as

required by IEEE® 802.3af-2005 and IEEE® 802.3at-2009

standards. This includes 2-event classification, Type 2 PSE

detection indicator (ATDET), PD detection, under-voltage lock

out (UVLO), and Hot-Swap FET integration.

The AS1138 has been architected to address both EM emission

concerns and surge/over-voltage protection in PoE applications.

The chip implements many design features that minimize

transmission of system common-mode noise onto the

Unshielded Twisted Pair (UTP). On-chip integration of surge

protection provides faster response to surge events and limits

stray surge current from passing through sensitive circuits, such

as the Ethernet PHY. The device is designed to provide safe,

low-impedance discharge paths directly to the earth ground,

resulting in superior reliability and circuit protection.

By using high-volume standard CMOS technology, Akros

enables its customers to implement higher-performance PoE devices with low cost and a small footprint.

TYPICAL APPLICATIONS

 Pan, tilt and zoom (PTZ), security and web cameras

 Voice over IP (VoIP) phones

 Wireless LAN access points, WiMax terminals

 Point-of-sale (PoS) terminals, RFID terminals

 Thin clients and notebook computers

 Fiber-to-the-home (FTTH) terminal