поискавой системы для электроныых деталей
  Russian  ▼
ALLDATASHEETRU.COM

X  

AD694AQ датащи(PDF) 10 Page - Analog Devices

номер детали AD694AQ
подробное описание детали  4??0 mA Transmitter
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD694AQ датащи(HTML) 10 Page - Analog Devices

Back Button AD694AQ Datasheet HTML 6Page - Analog Devices AD694AQ Datasheet HTML 7Page - Analog Devices AD694AQ Datasheet HTML 8Page - Analog Devices AD694AQ Datasheet HTML 9Page - Analog Devices AD694AQ Datasheet HTML 10Page - Analog Devices AD694AQ Datasheet HTML 11Page - Analog Devices AD694AQ Datasheet HTML 12Page - Analog Devices AD694AQ Datasheet HTML 13Page - Analog Devices AD694AQ Datasheet HTML 14Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 16 page
background image
AD694
–10–
REV. B
Figure 11. Buffer Amplifier VOS Adjustment
APPLICATIONS
CURRENT OUTPUT DAC INTERFACE
The AD694 can be easily interfaced to current output DACs
such as the AD566A to construct a digital to 4–20 mA interface
as shown in Figure 13. The AD694 provides the voltage refer-
ence and the buffer amplifier necessary to operate the DAC.
Only simple connections are necessary to construct the circuit.
The 10 V reference of the AD694 supplies reference input of the
AD566. The buffer amplifier converts the full-scale current to
+10 V utilizing the internal resistors in the DAC; therefore the
AD694 is configured for a 10 V full-scale input. A 10 pF capaci-
tor compensates for the 25 pF output capacitance of the DAC.
An optional 100
Ω trim resistor (R
T) allows the full-scale to be
trimmed, a 50
Ω resistor may be substituted if a trim is not re-
quired; accuracy will be typically
±1 LSB and the trim does not
affect the 4 mA offset. Care should be taken in managing the
circuit grounds. Connections from AD694 Pins 9, 3 and AD566
Pins 3 and 7 should be as short as possible and to a single point
close to Pin 5 of the AD694. Best practice would have separate
connections to the star ground from each pin; this is essential
Figure 12. Using the Alarm to Drive a TTL Gate
ALARM CIRCUIT
The AD694 has an alarm circuit which warns of open circuit
conditions at IOUT (Pin 11), or of attempts to drive the voltage
at IOUT higher than VS – 2 V. The alarm transistor will pull
down if an out of control condition is sensed. The alarm current
is limited to about 20 mA.
Figure 12 shows a typical application. In a digital/analog system
the alarm can provide a TTL signal to a controller. The collec-
tor of the alarm transistor is tied to the system logic supply
through a 20 k
Ω pull-up resistor. The alarm is off in normal op-
eration and the voltage at the alarm pin is high. In the event that
the wire from IOUT (Pin 11) is opened, or if a large input over-
drive forces IOUT too close to VS, then the alarm pin is driven
low. This configuration is compatible with CMOS or TTL logic
levels. The alarm transistor can also be used to directly drive an
LED or other indicators.
for the AD566 power ground from Pin 12. The 4–20 mA output
(Pin 11) must have a return path to the power ground. The re-
turn line from the load may be connected to the power ground,
or to the –15 V supply based upon the size of the load to be
driven, and on power dissipation considerations.
SINGLE-SUPPLY DIGITAL TO 4–20 mA INTERFACE
A 12 bit input to 4–20 mA output interface can be constructed
that operates on a single 15 V supply. The DAC is operated in
its voltage switching mode; this allows the DAC, when supplied
with a voltage reference of less than 2.5 V, to provide an output
voltage that is proportional to the digital input code and ranges
from 0 V to VREF. The AD694 voltage reference is connected to
supply 2 V and the input stage is set to a 2 V full scale; the input
buffer amplifier serves to buffer the voltage output from the
DAC. Connected in this manner, a full-scale DAC input code
will result in a 20 mA output and an all 0 code will result in a
4 mA output. The loading on the AD694 voltage reference is


Аналогичный номер детали - AD694AQ

производительномер деталидатащиподробное описание детали
logo
Analog Devices
AD694AQ AD-AD694AQ Datasheet
163Kb / 16P
   4??0 mA Transmitter
REV. B
AD694AQ AD-AD694AQ Datasheet
163Kb / 16P
   4??0 mA Transmitter
REV. B
AD694AQ AD-AD694AQ Datasheet
163Kb / 16P
   4??0 mA Transmitter
REV. B
More results

Аналогичное описание - AD694AQ

производительномер деталидатащиподробное описание детали
logo
Analog Devices
AD694 AD-AD694_02 Datasheet
163Kb / 16P
   4??0 mA Transmitter
REV. B
AD694BRZ AD-AD694BRZ Datasheet
163Kb / 16P
   4??0 mA Transmitter
REV. B
AD694BRZ-REEL AD-AD694BRZ-REEL Datasheet
163Kb / 16P
   4??0 mA Transmitter
REV. B
AD694ARZ AD-AD694ARZ Datasheet
163Kb / 16P
   4??0 mA Transmitter
REV. B
AD694 AD-AD694 Datasheet
163Kb / 16P
   4??0 mA Transmitter
REV. B
AD694JNZ AD-AD694JNZ Datasheet
163Kb / 16P
   4??0 mA Transmitter
REV. B
AD693BQ AD-AD693BQ Datasheet
462Kb / 12P
   Loop-Powered 4??0 mA Sensor Transmitter
REV. A
AD420ANZ-32 AD-AD420ANZ-32 Datasheet
303Kb / 16P
   Serial Input 16-Bit 4 mA??0 mA, 0 mA??0 mA DAC
Rev. H
AD420 AD-AD420_11 Datasheet
303Kb / 16P
   Serial Input 16-Bit 4 mA??0 mA, 0 mA??0 mA DAC
Rev. H
AD420 AD-AD420_15 Datasheet
303Kb / 16P
   Serial Input 16-Bit 4 mA??0 mA, 0 mA??0 mA DAC
Rev. H
More results


Html Pages

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


датащи скачать

Go To PDF Page


ссылки URL




Конфиденциальность
ALLDATASHEETRU.COM
Вашему бизинису помогли Аллдатащит?  [ DONATE ] 

Что такое Аллдатащит   |   реклама   |   контакт   |   Конфиденциальность   |   обмен ссыками   |   поиск по производителю
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