參數(shù)資料
型號： HFBR-4663
英文描述： Single Chip 10BASE-FL Transceiver(單芯片10BASE-FL收發(fā)器)
中文描述： 單片上10BASE -佛羅里達(dá)州收發(fā)器（單芯片的10 Base -佛羅里達(dá)州收發(fā)器）
文件頁數(shù)： 10/16頁
文件大?。?/td> 211K
代理商： HFBR-4663
10
SQE Test Function Signal
Quality Error
The SQE test function allows the
DTE to determine whether the
collision detect circuitry is
functional. After each trans-
mission, during the inter packet
gap time, the collision oscillator
will be activated for typically 1
μ
s.
The SQE test will not be activated
if the chip is in the low light state,
or the jabber on state.
For SQE to operate, the SQEN pin
must be tied to V
CC
.
This allows
the MAU to be interfaced to a
DTE. The SQE test can be
disabled by tying the SQEN pin to
ground, for a repeater interface.
Jabber Function
Requirements
The Jabber function prevents a
babbling transmitter from
bringing down the network.
Within the transceiver is a Jabber
timer that starts at the beginning
of each transmission and resets at
the end of each transmission. If
the transmission lasts longer than
20 ms the jabber logic disables
the transmitter, and turns on the
collision signal COL+, COL-.
When Tx+ and Tx- finally go idle,
a second timer measures 0.5
seconds of idle time before the
transmitter is enabled and
collision is turned off. Even
though the transmitter is disabled
during jabber, the 1 MHz idle
signal is still transmitted.
LED Drivers
The HFBR-4663 has five LED
drivers. The LED driver pins are
active low, and the LEDs are
normally off (except for LMON).
The LEDs are tied to their
respective pins through a 500
resistor to 5 volts.
The XMT, RCV and CLSN pins
have pulse stretchers on them
which enable the LEDs to be
visible. When transmission or
reception occurs, the LED XMT,
RCV or CLSN status pins will
activate low for several milli-
seconds. If another transmit,
receive or collision condition
occurs before the timer expires,
the LED timer will reset and
restart the timing. Therefore rapid
events will leave the LEDs
continuously on. The JAB and
LMON LEDs do not have pulse
stretchers on them since their
conditions occur long enough for
the eye to see.
Low Light Condition
The LMON LED output is used to
indicate a low light condition.
LMON is activated low when both
the receive power exceeds the
Link Monitor threshold and there
are transitions on V
IN
+, V
IN
- less
than 3
μ
s apart. If either one of
these conditions do not exist,
LMON will go high.
Input Amplifier
The V
IN
+, V
IN
- input signal is fed
into a limiting amplifier with a
gain of about 100 and input
resistance of 1.3 k
. Maximum
sensitivity is achieved through the
use of a DC restoration feedback
loop and AC coupling the input.
When AC coupled, the input DC
bias voltage is set by an on-chip
network at about 1.7 V. These
coupling capacitors, in
conjunction with the input
impedance of the amplifier,
establish a high pass filter with 3
dB corner frequency, f
L
, at
1
f
L
= ––––––––
2
π
1300C
Since the amplifier has a differ-
ential input, two capacitors of
equal value are required. If the
signal driving the input is single
ended, one of the coupling
capacitors can be tied to AV
CC
as
shown in Figure 1.
The internal amplifier has a
lowpass filter built-in to band
limit the input signal which in
turn will improve the signal noise
ratio.
Although the input is AC coupled,
the offset voltage
within
the
amplifier will be present at the
amplifier’s output. This is
represented by V
OS
in Figure 4. In
order to reduce this error a DC
feedback loop is incorporated.
This negative feedback loop nulls
the offset voltage, forcing V
OS
to
be zero. Although the capacitor
on V
DC
is non-critical, the pole it
creates can affect the stability of
the feedback loop. To avoid
stability problems, the value of
this capacitor should be at least
10 times larger than the input
coupling capacitors.
Figure 4.
V
OUT
+
V
OUT
-
V
OS
相關(guān)PDF資料
PDF描述
HFBR-5103 1300 nm 2000 m，F(xiàn)DDI, 100 Mbps ATM, and Fast Ethernet Transceivers in Low Cost 1x9 Package Style(1300 nm 2000 m，F(xiàn)DDI, 100 Mbps ATM, 快速以太網(wǎng)收發(fā)器（低價格 1x9 封裝類型）)
HFBR-5103T 1300 nm 2000 m，F(xiàn)DDI, 100 Mbps ATM, and Fast Ethernet Transceivers in Low Cost 1x9 Package Style(1300 nm 2000 m，F(xiàn)DDI, 100 Mbps ATM, 快速以太網(wǎng)收發(fā)器（低價格 1x9 封裝類型）)
HFBR-5104T 800 nm 500 m，F(xiàn)DDI, 100 Mbps ATM, and Fast Ethernet Transceivers in Low Cost 1x9 Package Style(800 nm 500 m，F(xiàn)DDI, 100 Mbps ATM, 快速以太網(wǎng)收發(fā)器（低價格 1x9 封裝類型）)
HFBR-5105T 1300nm 500 m，F(xiàn)DDI, 100 Mbps ATM, and Fast Ethernet Transceivers in Low Cost 1x9 Package Style(1300nm 500 m，F(xiàn)DDI, 100 Mbps ATM, 快速以太網(wǎng)收發(fā)器（低價格 1x9 封裝類型）)
HFBR-5104 800 nm 500 m，F(xiàn)DDI, 100 Mbps ATM, and Fast Ethernet Transceivers in Low Cost 1x9 Package Style(800 nm 500 m，F(xiàn)DDI, 100 Mbps ATM, 快速以太網(wǎng)收發(fā)器（低價格 1x9 封裝類型）)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HFBR-5000 功能描述:SC DUPLEX 1X9 PORT PLUG RoHS:否 類別:光電元件 >> 配件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 附件類型:USB 纜線 適用于相關(guān)產(chǎn)品:GTT-480270A 其它名稱:635-1047
HFBR-5001 功能描述:光纖連接器 Port Plug for FDDI M IC Transceivers RoHS:否 制造商:Molex 產(chǎn)品:Adapters 類型:8 Port with External Shutter 連接器類型:Adapter 模式:Multimode 光纖直徑: 顏色:Blue 附件類型:LC Adapter
HFBR-5002 制造商:Avago Technologies 功能描述:DUST COVER - Bulk
HFBR-5003 功能描述:SFF MT-RJ PORT PLUG RoHS:是 類別:光電元件 >> 配件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 附件類型:USB 纜線 適用于相關(guān)產(chǎn)品:GTT-480270A 其它名稱:635-1047
HFBR-5004 制造商:Avago Technologies 功能描述:EDL VINYL PORT CAPS - Bulk
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*