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參數資料
| 型號： | AD8018AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | 5 V, Rail-to-Rail, High-Output Current, xDSL Line Drive Amplifier |
| 中文描述： | DUAL OP-AMP, 17000 uV OFFSET-MAX, PDSO8 |
| 封裝： | PLASTIC, SOIC-8 |
| 文件頁數： | 12/19頁 |
| 文件大小： | 339K |
| 代理商： | AD8018AR |
REV. 0
AD8018
–12–
FREQUENCY
–
kHz
20
–
80
0
150
50
P
–
100
–
60
–
40
–
20
0
Figure 9. DMT Waveform in the Frequency Domain
MTPR versus transformer turns ratio is depicted in TPC 21 and
covers a variety of line power ranging from +12 dBm to +14 dBm.
As the turns ratio increases, the driver hybrid can deliver more
undistorted power due to higher output current capability.
Significant degradation of MTPR will occur if the output of the
driver swings to the rails, causing clipping at the DMT voltage
peaks. Driving DMT signals to such extremes not only compro-
mises
“
in-band
”
MTPR, but will also produce spurs that exist
outside of the frequency spectrum containing the desired DMT
power.
“
Out-of-band
”
spurious free dynamic range (SFDR) can
be defined as the relative difference in amplitude between these
spurs and a tone in one of the upstream bins. Compromising
out-of-band SFDR is equivalent to increasing near end cross-
talk (NEXT). Regardless of terminology, maintaining out-of-band
SFDR while reducing NEXT will improve the overall performance
of the modems connected at either end of the twisted pair.
TPC 21 shows how SFDR varies versus transformer turns ratio
for line power ranging from +12 dBm to +14 dBm. As line
power increases, or turns ratio decreases, SFDR degrades. The
power contained in the spurs can be measured relative to the
power contained in a typical upstream carrier and is expressed
in dBc as SFDR, similar to MTPR.
The supply voltage of the driver can also affect SFDR. As the
supply voltage is increased, voltage swing is increased as well,
resulting in the ability to deliver more power to the line with-
out sacrificing performance. This can be seen in TPC 22. Less
undistorted power is available when lower turns ratio transform-
ers are used due to voltage clipping of the signal.
TxDAC is a trademark of Analog Devices, Inc.
TIME
–
ms
4
–
0.25
V
0
3
1
0
2
–
0.2
–
1.5
–
1.0
–
0.05
0.05
1.0
1.5
0.2
–
3
–
2
–
1
Figure 10. DMT Signal in the Time Domain
Generating DMT Signals
At this time, DMT-modulated waveforms are not typically
menu-selectable items contained within AWGs. Even using
AWG software to generate DMT signals, AWGs that are available
today may not deliver DMT signals sufficient in performance
with regard to MTPR due to limitations in the D/A converters
and output drivers used by AWG manufacturers. Similar to
evaluating single-tone distortion performance of an amplifier,
MTPR evaluation requires a DMT signal generator capable of
delivering MTPR performance better than that of the driver
under evaluation. Generating DMT signals can be accom-
plished using a Tektronics AWG 2021 equipped with Option
4, (12-/24-bit, TTL Digital Data Out), digitally coupled to
Analog Devices
’
AD9754, a 14-bit TxDAC
, buffered by an
AD8002 amplifier configured as a differential driver. Note that
the DMT waveforms (available on the Analog Devices website,
http://www.analog.com), or similar .WFM files are needed to
produce the digital data required to drive the TxDAC from the
optional TTL Digital Data output of the TEK AWG2021.
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| AD8018ARU | 5 V, Rail-to-Rail, High-Output Current, xDSL Line Drive Amplifier |
| AD8018AR-REEL | 5 V, Rail-to-Rail, High-Output Current, xDSL Line Drive Amplifier |
| AD8019ARU-EVAL | DSL Line Driver with Power-Down |
| AD8019ARU-REEL | DSL Line Driver with Power-Down |
| AD8019 | DSL Line Driver with Power-Down |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8018AR-EBZ | 功能描述:BOARD EVALUATION FOR AD8018AR RoHS:是 類別:編程器，開發系統 >> 評估板 - 運算放大器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- |
| AD8018AR-EVAL | 功能描述:BOARD EVAL FOR AD8018 RoHS:否 類別:編程器，開發系統 >> 評估演示板和套件 系列:- 標準包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081 |
| AD8018AR-REEL | 制造商:Analog Devices 功能描述:ADSL Driver Dual 8-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| AD8018AR-REEL7 | 功能描述:IC XDSL LINE DVR R-R 8-SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發器 系列:- 標準包裝:27 系列:- 類型:收發器 驅動器/接收器數:3/3 規程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC 包裝:管件 |
| AD8018ARU | 制造商:Analog Devices 功能描述:ADSL Driver Dual 14-Pin TSSOP Tube 制造商:Rochester Electronics LLC 功能描述:TSSOP DUAL+5V HISPD HIOUTPUTCURRENT AMP - Bulk |
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