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AD8153 Datasheet(PDF) 21 Page - Analog Devices

Part No. AD8153
Description  Single Buffered Mux/Demux Switch
Download  24 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD8153 Datasheet(HTML) 21 Page - Analog Devices

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AD8153
Rev. 0 | Page 21 of 24
OUTPUT COMPLIANCE
Figure 40 is a graphical depiction of the single-ended waveform
at the output of the AD8153. The common-mode level (VOCM)
and the amplitude (VOSE) of this waveform are a function of the
output tail current (IT), the output termination supply voltage
(VTTO), 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 (VH) and low (VL) 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.
Table 9 shows an example calculation of the output levels for the
typical case, where VCC = VTTO = 3.3 V, with 50 Ω far-end
terminations to a 3.3 V supply.
VOCM
VH
VL
VOSE-DC VOSE-BOOST
VTTO
~320ps
Figure 40. Single-Ended Output Waveform
Table 9. Output Voltage Levels
DC-Coupled
AC-Coupled
PE Setting
IT (mA)
VOSE-DC (mV p-p)
VOSE-BOOST (mV p-p)
VOCM (V)
VH (V)
VL (V)
VOCM (V)
VH (V)
VL (V)
0
16
400
400
3.1
3.3
2.9
2.9
3.1
2.7
1
20
400
500
3.05
3.3
2.8
2.8
3.05
2.55
2
24
400
600
3
3.3
2.7
2.7
3
2.4
3
28
400
700
2.95
3.3
2.6
2.6
2.95
2.25
Table 10. Symbol Definitions
Symbol
Formula
Definition
VOSE-DC
Ω
×
=
25
0
PE
T
I
Single-ended output voltage swing after settling
VOSE-BOOST
Ω
×25
T
I
Boosted single-ended output voltage swing
VOCM (dc-coupled)
Ω
×
25
2
T
TTO
I
V
Common-mode voltage when the output is dc-coupled
VOCM (ac-coupled)
Ω
×
50
2
T
TTO
I
V
Common-mode voltage when the output is ac-coupled
VH
VOCM + VOSE-BOOST/2
High single-ended output voltage excursion
VL
VOCM - VOSE-BOOST/2
Low single-ended output voltage excursion


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