10 Base-T Interface Module
EPE6192AG-M
E L E C T R O N I C S I N C .
The circuit below is a guideline for interconnecting PCA’s EPE6192AG-M with a typical 10 Base-T PHY chip over UTP
cable. Further details of system design, such as chip pin-out, etc. can be obtained from the specific chip manufacturer.
Typical insertion loss of the isolation transformer/filter is 0.7dB. This parameter covers the entire spectrum of the encoded
signals in 10 Base-T protocols. However, the predistortion resistor network introduces some loss which has to be taken
into account in determining how well your design meets the Standard Template requirements. Additionally, the following
need to be considered while selecting resistor values :
a. The filter needs 100Ω termination, thus the Thevenin’s equivalent resistance seen by the filter looking into the transmit
outputs from the chip must be equal to a value close to 100Ω. The typical driver output impedance is 5Ω. Thus
choose R1 and R2 values that are lowered by 5Ω on each leg. Following these guidelines will guarantee that the
return loss specifications are satisfied at all extremes of cable impedance (i.e. 85Ω to 115Ω) while the module is
installed in your system.
b. That the template requirements are satisfied under the worst case Vcc (i.e. 4.5V), will impose a further constraint on
resistor selection, in that they ought to be the minimum derived from the calculations. Add R3 for more flexibility in
setting voltage levels at the outputs.
Note that some systems have auto polarity detection and some do not. If not, be certain to follow the proper polarity.
It is recommended that system designers ground the chip side center taps via a low voltage capacitor. Taking the cable
side center taps to chassis via capacitors, is not recommended, as this will add cost without containing EMI. This may
worsen EMI, specifically if the primary “common mode termination” is pulled to ground as shown.
The pulldown resistors used around the RJ45 connector have been known to suppress unwanted radiation that unused
wires pick up from the immediate environment. Their placement and use are to be considered carefully before a design is
finalized.
It is recommended that there be a neat separation of ground planes in the layout. It is generally accepted practice to limit
the plane off at least 0.08 inches away from the chip side pins of EPE6192AG-M. There need not be any ground plane
beyond this point.
For best results, PCB designer should design the outgoing traces preferably to be 50Ω, balanced and well coupled to
achieve minimum radiation from these traces.
Typical Application Circuit for UTP with external Resistor Network
R1
TX+
TX+
TX-
8
6
1
2
3
6
R2
TXd+
1
2
3
RJ45*
RX+
9
R1
R2
TX-
RX-
4
11
10 Base-T
PHY
EPE6192AG-M
5
8
7
TXd-
14
16 12
RX+
RX-
Chassis
Ground
Notes : * Pin-outs shown are for NIC configurations.
For Hubs and Repeaters swap pins 1-2 with pins 3-6.
CSE6192AG-Mb Rev. - 7/29/98
PCA ELECTRONICS, INC.
16799 SCHOENBORN ST.
NORTH HILLS, CA 91343
TEL: (818) 892-0761
FAX: (818) 894-5791
http://www.pca.com
5秒后页面跳转
VIPER22A的资料手册解读、引脚参数说明、代换型号推荐
ADS1256的资料手册解读、采集电压范围、读数变化原因分析及实际测量遇到的问题
MAX6675资料手册参数详解、引脚配置说明
LM258引脚图及功能介绍、主要参数分析
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
