參數(shù)資料
型號(hào)： AD8159ASVZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 13/24頁(yè)
文件大?。?/td> 0K
描述： IC MUX/DEMUX QUAD BUFF 100TQFP
標(biāo)準(zhǔn)包裝： 1
系列： XStream™
應(yīng)用： 2:1 多路復(fù)用器/1:2 多路分配器
接口： 串行
電源電壓： 3 V ~ 3.6 V
封裝/外殼： 100-TQFP 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 100-TQFP-EP（14x14）
包裝： 管件
安裝類(lèi)型： 表面貼裝
產(chǎn)品目錄頁(yè)面： 801 (CN2011-ZH PDF)
AD8159
Rev. B | Page 20 of 24
Consider the following example: a driver dc-coupled to the
input of the AD8159. The AD8159 input termination voltage
(VTTI) and the driver output termination voltage (VTTOD) are both
set to the same level; that is, VTTI = VTTOD = 3.3 V. If an 800 mV p-p
differential swing is desired, the total output current of the driver
is 16 mA. At balance, the output current is divided evenly between
the two sides of the differential signal path, 8 mA to each side.
This 8 mA of current flows through the parallel combination of the
55 Ω input termination resistor on the AD8159 and the 50 Ω
output termination resistor on the driver, resulting in a common-
mode level of
VTTI 8 mA × (50 Ω || 55 Ω) = VTTI 210 mV
The user can then use Figure 25 to determine the allowable
range of values for VTTI that meets the input compliance range
based on an 800 mV p-p differential swing.
OUTPUT COMPLIANCE
Figure 43 is depicts the single-ended waveform at the output of
the AD8159. The common-mode level (VOCM) and the amplitude
(VOSE-BOOST) 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 coupling 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 coupling or dc coupling may lead to transistor
saturation and poor transmitter performance.
Table 9 and Table 10 show the typical output levels for Port A/
Port B and Port C, respectively, where VCC = VTTO = 3.3 V, with
50 Ω far-end terminations to a 3.3 V supply.
056
11
-04
8
VOCM
VH
VL
VOSE-DC
VOSE-BOOST
VTTO
~320ps
Figure 43. Single-Ended Output Waveform
Table 9. Output Voltage Levels for Port A and Port B
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
3.1
3.3
2.9
3.1
2.7
1
20
400
500
3.05
3.3
2.8
3.05
2.55
2
24
400
600
3
3.3
2.7
3
2.4
3
28
400
700
2.95
3.3
2.6
2.95
2.25
Table 10. Output Voltage Levels for Port C
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
20
400
3.05
3.25
2.85
2.8
3
2.6
1
24
400
500
3
3.25
2.75
2.7
2.95
2.45
2
28
400
600
2.95
3.25
2.65
2.6
2.9
2.3
3
32
400
700
2.9
3.25
2.55
2.5
2.85
2.15
Table 11. Symbol Definitions
Symbol
Formula
Definition
VOSE-DC
0
=
PE
T
I
× 25 Ω
Single-ended output voltage swing after settling
VOSE-BOOST
IT × 25 Ω
Boosted single-ended output voltage swing
VOCM (dc-coupled)
VTTO – IT/2 × 25 Ω
Common-mode voltage when the output is dc-coupled
VOCM (ac-coupled)
VTTO – IT/2 × 50 Ω
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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