전자부품 데이터시트 검색엔진
  Korean  ▼
ALLDATASHEET.CO.KR

X  

AD8226ARMZ-RL 데이터시트(PDF) 10 Page - Analog Devices

부품명 AD8226ARMZ-RL
상세설명  Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
Logo AD - Analog Devices

AD8226ARMZ-RL 데이터시트(HTML) 10 Page - Analog Devices

Back Button AD8226ARMZ-RL Datasheet HTML 6Page - Analog Devices AD8226ARMZ-RL Datasheet HTML 7Page - Analog Devices AD8226ARMZ-RL Datasheet HTML 8Page - Analog Devices AD8226ARMZ-RL Datasheet HTML 9Page - Analog Devices AD8226ARMZ-RL Datasheet HTML 10Page - Analog Devices AD8226ARMZ-RL Datasheet HTML 11Page - Analog Devices AD8226ARMZ-RL Datasheet HTML 12Page - Analog Devices AD8226ARMZ-RL Datasheet HTML 13Page - Analog Devices AD8226ARMZ-RL Datasheet HTML 14Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 16 page
background image
AD8226
Preliminary Technical Data
Rev. PrA | Page 10 of 16
REFERENCE TERMINAL
The output voltage of the AD8226 is developed with respect to
the potential on the reference terminal. This is useful when the
output signal needs to be offset to a precise midsupply level. For
example, a voltage source can be tied to the REF pin to level-
shift the output so that the AD8226 can drive a single-supply
ADC. The REF pin is protected with ESD diodes and should
not exceed either +VS or −VS by more than 0.3 V.
For the best performance, source impedance to the REF
terminal should be kept below 2 Ω. As shown in Figure 3, the
reference terminal, REF, is at one end of a 50 kΩ resistor.
Additional impedance at the REF terminal adds to this 50 kΩ
resistor and results in amplification of the signal connected to
the positive input. The amplification from the additional RREF
can be computed by 2(50 kΩ + RREF)/100 kΩ + RREF.
Only the positive signal path is amplified; the negative path
is unaffected. This uneven amplification degrades CMRR.
INCORRECT
V
CORRECT
AD8226
OP1177
+
V
REF
AD8226
REF
Figure 4. Driving the Reference Pin
INPUT VOLTAGE RANGE
The three op amp architecture of the AD8226 applies gain in
the first stage before removing common-mode voltage in the
difference amplifier stage. In addition, the input transistors in
the first stage shift the common mode voltage up one diode
drop (about 650 mV.) Therefore, internal nodes between the
first and second stages (nodes 1 and 2 in Figure 3) experience a
combination of gained signal, common-mode signal, and
650 mV. This combined signal can be limited by the voltage
supplies even when the individual input and output signals are
not. Figure XX through Figure XX show the allowable
common-mode input voltage ranges for various output voltages
and supply voltages.
The following formulas can also be used to understand how the
reference voltage (VREF), common mode input voltage (VCM),
and differential input voltage (VDIFF) interact. These two
formulas, along with the input range specifications in Table 1
and Table 3, set the boundaries where the part operates with
best performance.
V
9.
0
2
)
)(
(
V
4.
0
+
<
+
<
S
CM
DIFF
S
V
V
GAIN
V
V
V
V
V
V
GAIN
V
S
REF
CM
DIFF
.6
1
2
2
)
)(
(
+
<
+
+
The common-mode input range shifts upwards with temper-
ature. At cold temperatures, the part requires an extra 200 mV
of headroom from the positive supply, and operation near the
negative supply has more margin. Conversely, hot temperatures
require less headroom from the positive supply, but are the worst-
case conditions for input voltages near the negative supply.
LAYOUT
To ensure optimum performance of the AD8226 at the PCB
level, care must be taken in the design of the board layout.
The AD8226 pins are arranged in a logical manner to aid in
this task.
8
7
6
5
1
2
3
4
–IN
RG
RG
+VS
VOUT
REF
–VS
+IN
TOP VIEW
(Not to Scale)
AD8226
Figure 5. Pinout Diagram
Common-Mode Rejection Ratio over Frequency
Poor layout can cause some of the common-mode signals to be
converted to differential signals before reaching the in-amp.
Such conversions occur when one input path has a frequency
response that is different from the other. To keep CMRR across
frequency high, input source impedance and capacitance of each
path should be closely matched. Additional source resistance in
the input path (for example, for input protection) should be placed
close to the in-amp inputs, which minimizes their interaction
with parasitic capacitance from the PCB traces.
Parasitic capacitance at the gain setting pins can also affect
CMRR over frequency. If the board design has a component
at the gain setting pins (for example, a switch or jumper), the
part should be chosen so that the parasitic capacitance is as
small as possible.
Power Supplies
A stable dc voltage should be used to power the instrumenta-
tion amplifier. Noise on the supply pins can adversely affect
performance.
A 0.1 µF capacitor should be placed as close as possible to each
supply pin. As shown in Figure 6, a 10 µF tantalum capacitor
can be used farther away from the part. In most cases, it can be
shared by other precision integrated circuits.


유사한 부품 번호 - AD8226ARMZ-RL

제조업체부품명데이터시트상세설명
logo
Analog Devices
AD8226ARMZ-RL AD-AD8226ARMZ-RL Datasheet
685Kb / 28P
   Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
REV. A
AD8226ARMZ-RL AD-AD8226ARMZ-RL Datasheet
707Kb / 29P
   Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
More results

유사한 설명 - AD8226ARMZ-RL

제조업체부품명데이터시트상세설명
logo
Analog Devices
AD8226 AD-AD8226_16 Datasheet
707Kb / 29P
   Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
AD8426 AD-AD8426_16 Datasheet
625Kb / 29P
   Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
AD8426 AD-AD8426 Datasheet
284Kb / 20P
   Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
Rev. PrD
AD8226ARMZ AD-AD8226ARMZ Datasheet
685Kb / 28P
   Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
REV. A
AD8227 AD-AD8227_16 Datasheet
539Kb / 25P
   Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
logo
Texas Instruments
INA827 TI1-INA827_13 Datasheet
1Mb / 30P
[Old version datasheet]   Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
logo
Analog Devices
AD8227 AD-AD8227 Datasheet
657Kb / 24P
   Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
REV. 0
AD8420 AD-AD8420 Datasheet
256Kb / 10P
   Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
Rev. PrD
AD8420 AD-AD8420_16 Datasheet
553Kb / 27P
   Wide Supply Range, Micropower, Rail-to-Rail Instrumentation Amplifier
logo
Texas Instruments
INA827 TI1-INA827 Datasheet
875Kb / 29P
[Old version datasheet]   Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier with a Minimum Gain of 5
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16


데이터시트 다운로드

Go To PDF Page


링크 URL




개인정보취급방침
ALLDATASHEET.CO.KR
ALLDATASHEET 가 귀하에 도움이 되셨나요?  [ DONATE ] 

Alldatasheet는?   |   광고문의   |   운영자에게 연락하기   |   개인정보취급방침   |   링크교환   |   제조사별 검색
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