Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

AD8143 Datasheet(PDF) 17 Page - Analog Devices

Part # AD8143
Description  High Speed, Triple Differential Receiver with Comparators
Download  24 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8143 Datasheet(HTML) 17 Page - Analog Devices

Back Button AD8143_15 Datasheet HTML 13Page - Analog Devices AD8143_15 Datasheet HTML 14Page - Analog Devices AD8143_15 Datasheet HTML 15Page - Analog Devices AD8143_15 Datasheet HTML 16Page - Analog Devices AD8143_15 Datasheet HTML 17Page - Analog Devices AD8143_15 Datasheet HTML 18Page - Analog Devices AD8143_15 Datasheet HTML 19Page - Analog Devices AD8143_15 Datasheet HTML 20Page - Analog Devices AD8143_15 Datasheet HTML 21Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 17 / 24 page
background image
AD8143
Rev. 0 | Page 17 of 24
THEORY OF OPERATION
The AD8143 amplifiers use an architecture called active
feedback, which differs from that of conventional op amps. The
most obvious differentiating feature is the presence of two
separate pairs of differential inputs compared to a conventional
op amp’s single pair. Typically, for the active-feedback architecture,
one of these input pairs is driven by a differential input signal,
while the other is used for the feedback. This active stage in the
feedback path is where the term active feedback is derived.
The active feedback architecture offers several advantages over a
conventional op amp in several types of applications. Among
these are excellent common-mode rejection, wide input common-
mode range, and a pair of inputs that are high impedance and
completely balanced in a typical application. In addition, while
an external feedback network establishes the gain response as in
a conventional op amp, its separate path makes it entirely
independent of the signal input. This eliminates any interaction
between the feedback and input circuits, which traditionally
causes problems with CMRR in conventional differential-input
op amp circuits.
Another advantage of active feedback is the ability to change the
polarity of the gain merely by switching the differential inputs.
A high input impedance inverting amplifier can therefore be
made. Besides high input impedance, a unity-gain inverter with
the AD8143 has noise gain of unity, producing lower output
noise and higher bandwidth than op amps that have noise gain
equal to 2 for a unity-gain inverter.
The two differential input stages of the AD8143 are each
transconductance stages that are well-matched. These stages
convert the respective differential input voltages to internal
currents. The currents are then summed and converted to a
voltage, which is buffered to drive the output. The compensation
capacitor is included in the summing circuit. When the
feedback path is closed around the part, the output drives
the feedback input to that voltage which causes the internal
currents to sum to zero. This occurs when the two differential
inputs are equal and opposite; that is, their algebraic sum is zero.
In a closed-loop application, a conventional op amp has its
differential input voltage driven to near zero under non-
transient conditions. The AD8143 generally has differential
input voltages at each of its input pairs, even under equilibrium
conditions. As a practical consideration, it is necessary to
internally limit the differential input voltage with a clamp
circuit. Thus, the input dynamic ranges are limited to about
2.5 V for the AD8143 (see Specifications section for more
detail). For this and other reasons, it is not recommended to
reverse the input and feedback stages of the AD8143, even
though some apparently normal functionality may be observed
under some conditions.


Similar Part No. - AD8143_15

ManufacturerPart #DatasheetDescription
logo
Analog Devices
AD8143 AD-AD8143_16 Datasheet
639Kb / 24P
   High Speed, Triple Differential Receiver with Comparators
More results

Similar Description - AD8143_15

ManufacturerPart #DatasheetDescription
logo
Analog Devices
AD8145 AD-AD8145_15 Datasheet
464Kb / 24P
   High Speed, Triple Differential Receiver with Comparators
REV. A
AD8143 AD-AD8143_16 Datasheet
639Kb / 24P
   High Speed, Triple Differential Receiver with Comparators
AD8143 AD-AD8143 Datasheet
577Kb / 24P
   High Speed, Triple Differential Receiver with Comparators
REV. 0
AD8145 AD-AD8145 Datasheet
584Kb / 24P
   High Speed, Triple Differential Receiver with Comparators
REV. 0
AD8145WYCPZ-R7 AD-AD8145WYCPZ-R7 Datasheet
464Kb / 24P
   High Speed, Triple Differential Receiver with Comparators
REV. A
logo
National Semiconductor ...
LM161 NSC-LM161 Datasheet
271Kb / 10P
   High Speed Differential Comparators
logo
Texas Instruments
LM161 TI1-LM161_15 Datasheet
988Kb / 16P
[Old version datasheet]   High Speed Differential Comparators
logo
Analog Devices
AD8122 AD-AD8122 Datasheet
402Kb / 13P
   Triple Differential Receiver
Rev. PrC
logo
Texas Instruments
SN65LVDS33-EP TI1-SN65LVDS33-EP Datasheet
618Kb / 23P
[Old version datasheet]   HIGH-SPEED DIFFERENTIAL RECEIVER
SN55LVDS33-SP TI1-SN55LVDS33-SP Datasheet
252Kb / 20P
[Old version datasheet]   HIGH-SPEED DIFFERENTIAL RECEIVER
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com