參數(shù)資料
型號: AD8153_07
廠商: Analog Devices, Inc.
英文描述: 3.2 Gbps Single Buffered Mux/Demux Switch
中文描述: 3.2 Gbps的單緩沖/解復(fù)用器開關(guān)
文件頁數(shù): 21/24頁
文件大小: 587K
代理商: AD8153_07
AD8153
OUTPUT COMPLIANCE
Figure 40 is a graphical depiction of the single-ended waveform
at the output of the AD8153. The common-mode level (V
OCM
)
and the amplitude (V
OSE
) of this waveform are a function of the
output tail current (I
T
), the output termination supply voltage
(V
TTO
), the topology of the far-end receiver, and whether ac- or
dc-coupling is used. Keep in mind that the output tail current
varies with the pre-emphasis level. The user must ensure that
the high (V
H
) and low (V
L
) voltage excursions at the output are
within the single-ended absolute voltage range limits as
specified in Table 1. Failure to understand the implications of
output signal levels and the choice of ac- or dc-coupling may
lead to transistor saturation and poor transmitter performance.
Rev. 0 | Page 21 of 24
Table 9 shows an example calculation of the output levels for the
typical case, where V
CC
= V
TTO
= 3.3 V, with 50
Ω
far-end
terminations to a 3.3 V supply.
0
V
OCM
V
H
V
L
V
OSE-DC
V
OSE-BOOST
V
TTO
~320ps
Figure 40. Single-Ended Output Waveform
Table 9. Output Voltage Levels
PE Setting
I
T
(mA)
0
16
1
20
2
24
3
28
V
OSE-DC
(mV p-p)
400
400
400
400
V
OSE-BOOST
(mV p-p)
400
500
600
700
DC-Coupled
V
H
(V)
3.3
3.3
3.3
3.3
AC-Coupled
V
H
(V)
3.1
3.05
3
2.95
V
OCM
(V)
3.1
3.05
3
2.95
V
L
(V)
2.9
2.8
2.7
2.6
V
OCM
(V)
2.9
2.8
2.7
2.6
V
L
(V)
2.7
2.55
2.4
2.25
Table 10. Symbol Definitions
Symbol
V
OSE-DC
Formula
Definition
Single-ended output voltage swing after settling
Ω
×
Ω
=
25
0
PE
×
25
T
I
V
OSE-BOOST
T
I
Boosted single-ended output voltage swing
V
OCM
(dc-coupled)
Ω
×
25
2
I
T
TTO
V
I
Common-mode voltage when the output is dc-coupled
V
OCM
(ac-coupled)
Ω
×
50
2
T
TTO
V
Common-mode voltage when the output is ac-coupled
V
H
V
OCM
+ V
OSE-BOOST
/2
High single-ended output voltage excursion
V
L
V
OCM
- V
OSE-BOOST
/2
Low single-ended output voltage excursion
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