- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄364515 > 84221 84221 Quad 10/100 Mbps TX/FX/10BT (PHY) manual 1/99 PDF資料下載
參數(shù)資料
| 型號： | 84221 |
| 英文描述： | 84221 Quad 10/100 Mbps TX/FX/10BT (PHY) manual 1/99 |
| 中文描述： | 84221四10/100 Mbps的TX/FX/10BT（PHY）的手冊1 / 99 |
| 文件頁數(shù)： | 46/70頁 |
| 文件大?。?/td> | 1017K |
| 代理商： | 84221 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁當前第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁
46
MD400184/A
84221
Table 21. TP Transformer Sources
4.2.2 Receive Interface
Receive data is typically transformer coupled into the
receive inputs on TPIP/N and terminated with an
external resistor as shown in Figure 12.
The transformer for the receiver is recommended to have
a winding ration of 1:1, as shown in Figure 12. The
specifications for such a transformer are shown in Table
20. Sources for the transformer are listed in Table 21.
The receive input needs to be terminated with the correct
termination impedance to meet the input impedance and
return loss requirements of IEEE 802.3. In addition, the
receive TP inputs need to be attenuated. It is
recommended that both the termination and attenuation
be accomplished by placing four external resistors in
series across the TPIP/N inputs as shown in Figure 12.
The resistors should be 25%/25%/25%/25% of the total
series resistance, and the total series resistance should
be equal to the characteristic impedance of the cable
(100 ohms for UTP 150 Ohms for STP). For 100 Ohm
twisted pair the resistor string values should be 25 Ohms
each (1%). It is also recommended that a 0.1uF capacitor
be placed between the center of the series resistor string
and Vcc in order to provide an AC ground for attenuating
common mode signal at the input. This capacitor is also
shown in Figure 12.
To minimize common mode input noise and to aid in
meeting susceptibility requirements, it may be necessary
to add a common mode choke on the receive input as
well as add common mode bundle termination. The
transformers listed in Table 24 contain common mode
chokes on both the transmit and receive sides, as shown
in Figure 12. Common mode bundle termination is
achieved by tying the receive secondary center tap and
the unused pairs in the RJ45 to chassis ground through
75 ohm resistors and a 0.01 uF capacitor, as shown in
Figure 12.
In order to minimize noise pickup into the receive path in
a system or on a PCB, the loading on TPIP/N should be
minimized and both inputs should be loaded equally.
4.3 TP TRANSMIT OUTPUT CURRENT SET
The TPOP/N output current level is set by an external
resistor tied between REXT and GND. This output
current is determined by the following equation where R is
the value of REXT:
I
out
= (10K/R) * I
ref
Where I
ref
= 40 mA (100 Mbps, UTP)
= 32.6 mA (100 Mbps, STP)
= 100 mA (10 Mbps, UTP)
= 81.6 mA (10 Mbps, STP)
For 100 Ohm UTP REXT should be typically set to 10K
ohms and REXT should be a 1% resistor in order to meet
IEEE 802.3 specified levels. Once REXT is set for the
100 Mbps and UTP modes as shown by the equation
above, I
ref
is then automatically changed inside the
device when the 10 Mbps mode or UTP120/STP150
modes are selected as described in the Twisted Pair
Characteristics Transmit Section.
Keep resistor REXT as close to pins REXT and GND as
possible in order to reduce noise pickup into the
transmitter.
Since the TP output is a current source, capacitive and
inductive loading can reduce the output voltage level from
the ideal. Thus, in an actual application, it might be
necessary to adjust the value of the output current to
compensate for external loading. The TP output level can
be adjusted by changing the value of the external resistor
tied to RXT
Vendor
Pulse
bel
Part Number
H1062
S558-
5999B47
6931-30
ST6179
TG110-
S453NX
H1053
Pin Out Type
Stacked
Stacked
nano pulse
Valor
Halo
Stacked
Stacked
Stacked
Pulse
Non-
Stacked
Non-
Stacked
Non -
Stacked
Non-
Stacked
Non-
Stacked
bel
S558-5999-
J5
6949-30
nano pulse
Valor
ST6403P
Halo
TG110-
S456NX
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 84221 | Quad 100BaseTX/100BaseFX/10BaseT Physical Layer Device （Highly Integrated Ethernet Transceiver For Twisted Pair And Fiber Ethernet Applications）(四通道100BaseTX/100BaseFX/10BaseT 物理層處理器（高度集成的以太網(wǎng)雙絞線和光纖數(shù)據(jù)收發(fā)器）) |
| 84301 | 84301 4-Port Fast Ethernet Controller manual 3/98 |
| 84301 | 4-Port Fast Ethernet Controller( 4端口快速以太網(wǎng)控制器) |
| 84717000 | MINIATURNAEHERUNGSSCHALTER 4MM GLATT PNP |
| 84717002 | MINIATURNAEHERUNGSSCHALTER M5 PNP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 842225 REV A1 | 制造商:Aavid Thermalloy 功能描述:- Bulk |
| 84222C | 功能描述:固定電感器 2.2uH 2.0A Mini SMT Power RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
| 8422303301B | 制造商:ESSEX 功能描述:SPDT 277V. COIL ENCLOSED RELAY |
| 84223C | 功能描述:固定電感器 22uH 0.6A Mini SMT Power RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
| 84224C | 功能描述:固定電感器 220uH 0.2A Mini SMT Power RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。