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參數(shù)資料
| 型號： | TB5D2HLDW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | QUAD DIFFERENTIAL PECL DRIVERS |
| 中文描述： | 四路差分PECL驅(qū)動 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大小： | 354K |
| 代理商： | TB5D2HLDW |
www.ti.com
Load Circuits
The test load circuits shown in Figure 3 and Figure 4
are based on a recommended
pi
type of load circuit
shown in Figure 15. The 100-
differential load
resistor R
T
at the receiver provide proper termination
for the interconnecting transmission line, assuming it
has a 100-
characteristic impedance. The two
resistors R
S
to ground at the driver end of the
transmission line link provide dc current paths for the
emitter follower output transistors. The two resistors
to ground normally should not be placed at the
receiver end, as they shunt the termination resistor,
potentially creating an impedance mismatch with
undesirable reflections.
Recommended Resistor Values:
T
= 100
, R
S
= 30
For 5 V Nom Supplies, R
T
, R
S
R
T
/2
Transmission Line
OUTPUT
INPUT
R
S
R
T
/2
Recommended Resistor Values:
Fo = V
T
= 100
,
V
T
CC
- 2.55 V
R
T
/2
Transmission Line
OUTPUT
INPUT
V
T
R
T
/2
_
+
INPUT
R
T
= 100
OUTPUT
R
S
R
S
Transmission Line
Recommended Resistor Values:
For 5-V Nominal Supplies, R
S
= 200
For 3.3-V Nominal Supplies, R
S
= 75
TB5D1M, TB5D2H
SLLS579B–SEPTEMBER 2003–REVISED MAY 2004
Figure 16. A Recommended
Y
Load Circuit
An additional load circuit, similar to one commonly
used with ECL and PECL, is shown in Figure 17.
Figure 17. A Recommended PECL-Style Load
Circuit
Figure 15. A Recommended
pi
Load Circuit
An important feature of all of these recommended
load circuits is that they ensure that both of the
emitter follower output transistors remain active
(conducting current) at all times. When deviating from
these recommended values, it is important to make
sure that the low-side output transistor does not turn
off. Failure to do so increases the t
skew2
and V
OC(PP)
values, increasing the potential for electromagnetic
radiation.
Another common load circuit, a
Y
load, is shown in
Figure 16. The receiver-end line termination of R
T
is
provided by the series combination of the two RT/2
resistors, while the dc current path to ground is
provided by the single resistor R
S
. Recommended
values, as a function of the nominal supply voltage
range, are indicated in the figure.
12
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TB5D2HLDWR | 功能描述:LVDS 接口集成電路 Hi Spd Diff Line Drvr RoHS:否 制造商:Texas Instruments 激勵器數(shù)量:4 接收機(jī)數(shù)量:4 數(shù)據(jù)速率:155.5 Mbps 工作電源電壓:5 V 最大功率耗散:1025 mW 最大工作溫度:+ 85 C 封裝 / 箱體:SOIC-16 Narrow 封裝:Reel |
| TB5E-020.0M | 制造商:CONNOR-WINFIELD 制造商全稱:Connor-Winfield Corporation 功能描述:High Precision TCXO / VCTCXO |
| TB5F-020.0M | 制造商:CONNOR-WINFIELD 制造商全稱:Connor-Winfield Corporation 功能描述:High Precision TCXO / VCTCXO |
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| TB5MAU | 制造商:Switchcraft 功能描述: |
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