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(yè)數(shù)： 21/24頁(yè)
文件大?。?/td> 499K
代理商： AD8159-EVAL-DC
AD8159
AC Coupling
In general, more V
TTO
supply headroom is required with ac-
coupled outputs. When the outputs are ac-coupled, the average
single-ended current does not see the far end 50 Ω termination
because the capacitor acts as a dc block. For example, with
PE = 0, the single-ended output current alternates from 0 mA
to 16 mA, or 8 mA on average. This 8 mA current flows entirely
through the on-chip 50 Ω termination resistor due to the dc
block.
Rev. A | Page 21 of 24
The single-ended output voltage has an average value of
V
TTO
8
mA
×
50 Ω =
V
TTO
400 mV
For appropriate data patterns,
1
the capacitor acts as a short and
the voltage swing is 400 mV p-p, identical to the dc-coupled case.
The low output voltage is, therefore,
V
TTO
400 mV 200 mV =
V
TTO
600 mV
1
AC coupling requires that the signal pattern have no long term dc
component. Codes such as 8b/10b, for example, ensure that the data
pattern is benign in an ac-coupled link.
The lowest acceptable value for V
TTO
is
V
CC
1.6 V + 0.6 V =
V
CC
1.0 V
The same exercise can be repeated for other pre-emphasis
settings.
Output Compliance Table
To simplify the task of interfacing to the AD8159 output,
Table 13 is useful as a quick-reference. It provides the minimum
and maximum values for output termination voltage for both
ac and dc coupling. The values in the table are valid for any pre-
emphasis setting.
Table 13. Output Compliance
AC-Coupled
Minimum
(V)
(V)
V
TTO
V
CC
– 0.5
V
CC
+ 0.6
V
TTOI
V
CC
– 0.4
V
CC
+ 0.6
DC-Coupled
Maximum
Minimum
(V)
V
CC
– 0.9
V
CC
– 0.8
Maximum
(V)
V
CC
+ 0.6
V
CC
+ 0.6
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