数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

AD694BRZ-REEL 数据表(PDF) 10 Page - Analog Devices

部件名 AD694BRZ-REEL
功能描述  4??0 mA Transmitter
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD694BRZ-REEL 数据表(HTML) 10 Page - Analog Devices

Back Button AD694BRZ-REEL Datasheet HTML 6Page - Analog Devices AD694BRZ-REEL Datasheet HTML 7Page - Analog Devices AD694BRZ-REEL Datasheet HTML 8Page - Analog Devices AD694BRZ-REEL Datasheet HTML 9Page - Analog Devices AD694BRZ-REEL Datasheet HTML 10Page - Analog Devices AD694BRZ-REEL Datasheet HTML 11Page - Analog Devices AD694BRZ-REEL Datasheet HTML 12Page - Analog Devices AD694BRZ-REEL Datasheet HTML 13Page - Analog Devices AD694BRZ-REEL 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


类似零件编号 - AD694BRZ-REEL

制造商部件名数据表功能描述
logo
Analog Devices
AD694BRZ AD-AD694BRZ Datasheet
163Kb / 16P
   4??0 mA Transmitter
REV. B
AD694BRZ AD-AD694BRZ Datasheet
163Kb / 16P
   4??0 mA Transmitter
REV. B
More results

类似说明 - AD694BRZ-REEL

制造商部件名数据表功能描述
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
AD694ARZ AD-AD694ARZ Datasheet
163Kb / 16P
   4??0 mA Transmitter
REV. B
AD694 AD-AD694 Datasheet
163Kb / 16P
   4??0 mA Transmitter
REV. B
AD694BRZ AD-AD694BRZ 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


数据表 下载

Go To PDF Page


链接网址




隐私政策
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   链接交换   |   制造商名单
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