Datasheet > AS1138

AS1138

更新时间： 2024-09-17 12:56:43

品牌	Logo	应用领域
AKM		/
页数	文件大小	规格书
28页	929K
描述
single-chip, highly integrated CMOS solution

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AS1138 数据手册

AS1138

DATASHEET

GENERAL DESCRIPTION

FEATURES

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 is fully integrated and architected at a system level

to provide the following features and compliance:



Full support of both IEEE® Std. 802.3af-2005 and

IEEE® Std. 802.3at-2009 power requirements

“2-Event” classification for 802.3at higher power PDs

Robust Type 2 PSE detector with proprietary digital

filtering for line noise to eliminate false positives

IEC 61000-4-2/3/4/5/6 requirements for EMC

Compliance

Integrated Surge Protection for 15kV/8kV System

level ESD Compliance

Integrated DC-DC controller for exceptional EMI

performance



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.



Programmable DC current limit up to 720mA for 30W

applications

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.



Seamless support for local power, down to 9.5V

Implemented in robust 100V automotive process

Low Rds-on Hot-Swap FET (typical 0.8Ω)

Integrated Short-Circuit Protection

Over temperature protection

Industrial temperature range, -40º to +85ºC

5x5 mm, 20 lead QFN Package, RoHS compliant

TYPICAL APPLICATIONS

By using high-volume standard CMOS technology, Akros

enables its customers to implement higher-performance PoE

devices with low cost and a small footprint.



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

Figure 1 - Typical PoE PD Application (Flyback Converter)

10/100/1K

PHY

Processor

GMII

Local

Power

AS1138

Surge

Protection

LVMODE

Local

Adapter

Control

Current

Limit /

Sense

Signature

Extended

Classification

& MPS

DC-DC

Controller

With

UVLO

Managed

Emissions

Control

Thermal

Limit

Protection

Detection

ATDET

PD Controller

Version 1.4

12 3 4 5 6 7...28

中文翻译

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与AS1138相关器件

型号	品牌	获取价格	描述	数据表
AS113-XXX-1	Narda-ATM	获取价格	OUTLINE, DUAL CONCENTRIC ROTARY STEP ATTENUATOR
AS-114	NUVOTEM TALEMA	获取价格	Current Sense Inductors & Transformers
AS114D80	SUMIDA	获取价格	Transponders (TX)
AS-115	NUVOTEM TALEMA	获取价格	Current Sense Inductors & Transformers
AS1150	AMSCO	获取价格	Quad LVDS Receivers
AS1150-T	AMSCO	获取价格	Quad LVDS Receivers
AS1151	AMSCO	获取价格	Quad LVDS Receivers
AS1151-T	AMSCO	获取价格	Quad LVDS Receivers
AS1152	AMSCO	获取价格	Quad LVDS Driver
AS1152-T	AMSCO	获取价格	Quad LVDS Driver

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