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參數(shù)資料
| 型號(hào)： | AD8159-EVAL-DC |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 3.2 Gbps Quad Buffer Mux/Demux |
| 中文描述： | 3.2 Gbps的四緩沖/解復(fù)用器 |
| 文件頁數(shù)： | 19/24頁 |
| 文件大?。?/td> | 499K |
| 代理商： | AD8159-EVAL-DC |
AD8159
INTERFACING TO THE AD8159
TERMINATION STRUCTURES
To determine the best strategy for connecting to the high speed
pins of the AD8159, the user must first be familiar with the on-
chip termination structures. The AD8159 contains two types of
these structures (see
Figure 41 and Figure 42): one type for input
and bidirectional ports and one type for output ports.
Rev. A | Page 19 of 24
For output ports, there are two 50 Ω resistors connected to the
termination supply. Note that the differential input resistance
for both structures is the same, 100 Ω.
INPUT COMPLIANCE
The range of allowable input voltages is determined by the
fundamental limitations of the active input circuitry. This range
of signals is normally a function of the common-mode level of
the input signal, the signal swing, and the supply voltage. For a
given input signal swing, there is a range of common-mode
voltages that keeps the high and low voltage excursions within
acceptable limits. Similarly, for a given common-mode input
voltage there is a maximum acceptable input signal swing.
There is also a minimum signal swing that the active input
circuitry can resolve reliably.
0
54.5
54.5
1173
V
TTI
/V
TTIO
/V
TTOI
N
P
Figure 41. Termination Structure: Input and Bidirectional Ports
0
50
50
V
TTO
P
N
Figure 22 and Figure 25 summarize the input voltage ranges for
all ports. Note that the input range is different when comparing
bidirectional ports to strictly input ports. This is a consequence
of the additional circuitry required to support the bidirectional
feature on Port C.
Figure 42. Output Ports
For input and bidirectional ports, the termination structure
consists of two 54.5 Ω resistors connected to a termination
supply and an 1173 Ω resistor connected across the differential
inputs, the latter being a result of the finite differential input
impedance of the equalizer.
AC Coupling
One way to simplify the input circuit and make it compatible
with a wide variety of driving devices is to use ac coupling. This
has the effect of isolating the dc common-mode levels of the
driver and the AD8159 input circuitry. AC coupling requires a
capacitor in series with each single-ended input signal, as shown
in Figure 43. This should be done in a manner that does not
interfere with the high speed signal integrity of the PCB.
0
50
50
V
CC
V
CC
54.5
V
TTI
/V
TTIO
DRIVER
Figure 43. AC-Coupling Input Signal of AD8159
AD8159
54.5
VEE
1173
C
P
C
N
IP
IN
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
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| AD815ARB-24-REEL | 制造商:Analog Devices 功能描述:ADSL Driver Dual 24-Pin SOIC W Bat T/R 制造商:Rochester Electronics LLC 功能描述:SOIC HIGH OUTPUT CURRENT DIFF DRIVER - Tape and Reel |
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