POE芯片AS1138 AKROS品牌
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
