전자부품 데이터시트 검색엔진
  Korean  ▼
ALLDATASHEET.CO.KR

X  

ADR3440 데이터시트(PDF) 5 Page - Analog Devices

부품명 ADR3440
상세설명  Devices Connected
Download  9 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
Logo AD - Analog Devices

ADR3440 데이터시트(HTML) 5 Page - Analog Devices

  ADR3440 Datasheet HTML 1Page - Analog Devices ADR3440 Datasheet HTML 2Page - Analog Devices ADR3440 Datasheet HTML 3Page - Analog Devices ADR3440 Datasheet HTML 4Page - Analog Devices ADR3440 Datasheet HTML 5Page - Analog Devices ADR3440 Datasheet HTML 6Page - Analog Devices ADR3440 Datasheet HTML 7Page - Analog Devices ADR3440 Datasheet HTML 8Page - Analog Devices ADR3440 Datasheet HTML 9Page - Analog Devices  
Zoom Inzoom in Zoom Outzoom out
 5 / 9 page
background image
Circuit Note
CN-0287
Rev. C | Page 5 of 9
Protection Circuits
Transient and overvoltage conditions are possible both during
manufacturing and in the field. To achieve a high level of
protection, additional external protection circuitry is necessary
to compliment the IC’s internal integrated protection circuitry.
The external protection adds additional capacitance, resistance,
and leakage. These effects should be carefully considered to
achieve a high level of accuracy. The additional protection
circuitry is shown in Figure 5.
Figure 5. Transient and Overvoltage Protection Circuit
Leakage currents can have a significant effect on RTD
measurements so should be carefully considered. Leakage currents
can also create some error in thermocouple measurements in
the case where long thermocouple leads have significant resistance.
In this circuit, the PTVS30VP1UP transient voltage suppressor
(TVS) quickly clamps any transient voltages to 30 V with only
1 nA typical leakage current at 25°C. A 30 V TVS was chosen to
allow for a 30 V dc overvoltage. A 1.69 kΩ resistor followed by
low leakage BAV199LT1G Schottky diodes are used to clamp the
voltage to the 5 V power rail during transient and dc overvoltage
events. The 1.69 kΩ resistor limits the current through the
external diodes to about 15 mA during a 30 V dc overvoltage
condition. In order to ensure the power rail is able to sink this
current, a Zener diode is used to clamp the power rail to ensure
it does not exceed the absolute maximum rating of any of the
IC’s connected to the supply. The 5.6 V Zener diode (NZH5V6B) is
selected for this purpose. A 300 Ω resistor limits any further
current that could flow into the AD7193 or the ADG738.
Isolation
The ADuM5401 and the ADuM1280 use ADI iCoupler®
technology provide 2500 V rms isolation voltage between the
measurement side and the controller side of the circuit. The
ADuM5401 also provides the isolated power for measurement
side of the circuit. The isoPower technique used in the ADuM5401
uses high frequency switching elements to transfer power
through a transformer. Special care must be taken with the
printed circuit board (PCB) layout to meet emissions standards.
Refer to AN-0971 Application Note for board layout
recommendations.
Thermocouple Configuration Test Results
The performance of the circuit is highly dependent on the
sensor and the configuration of the AD7193. The Type-K
thermocouple output varies from −10 mV to +60 mV,
corresponding to −200°C to +1350°C. The AD7193 PGA is
configured for G = 32. The voltage swing out of the PGA is
−320 mV to +1.92 V, or 2.24 V p-p. With chop enabled,
50 Hz/60Hz noise reduction enabled, and filter word FS[9:0] =
96, the noise distribution histogram for 1024 samples is shown
in Figure 6.
Figure 6. Noise Distribution Histogram of CN-0287 (VDD = 5 V, VREF =
4.096 V, Differential Input, Bipolar, Input Buffer Enable, Output Data rate =
50 Hz, Gain = 32, Chop Enable, 60 Hz Rejection Enable, Sinc4)
The resolution of the AD7193 is 24 bits, or 224 = 16,777,216
codes. The full dynamic range of the AD7193 is 2 × VREF = 2 ×
4.096 V = 8.192 V. The output voltage of the thermocouple after
the PGA is only 2.24 V p-p and does not occupy all the dynamic
range of the AD7193. Therefore the range of the system is
decreased by a factor of 2.24 V/8.192V.
The noise distribution is about 40 codes peak-to-peak. The
noise-free code resolution over the 2.24 Vp-p range of
measurement is given by:
bits
8
.
16
V
192
.
8
V
24
.
2
400
216
,
777
,
16
log
2
=
×
=
Resolution
Free
Noise
(6)
The full-scale temperature range of the Type-K thermocouple is
−200°C to +1350°C, or 1550°C p-p. The 16.8 bits of noise-free
code resolution therefore corresponds to 0.013°C of noise-free
temperature resolution.
+5V
1.69kΩ
TVS
30V, 600W
PTVS30VP1UP
300Ω
OVERVOLTAGE
UP TO 30V
SCHOTTKY DIODES
BAV199LT1G
+5V
15mA
+6V,
−1V
ADC
INPUT
+5.3V,
−0.3V
3mA
5.6V ZENER DIODE
NZH5V6B
110
100
90
80
70
60
NUMBER OF OCCURENCES
50
40
30
20
10
0


유사한 부품 번호 - ADR3440

제조업체부품명데이터시트상세설명
logo
Analog Devices
ADR3440 AD-ADR3440 Datasheet
900Kb / 24P
   Micropower, High Accuracy Voltage References
REV. B
ADR3440ARJZ AD-ADR3440ARJZ Datasheet
395Kb / 6P
   Tape and Reel Packaging
ADR3440ARJZ-R2 AD-ADR3440ARJZ-R2 Datasheet
900Kb / 24P
   Micropower, High Accuracy Voltage References
REV. B
ADR3440ARJZ-R7 AD-ADR3440ARJZ-R7 Datasheet
900Kb / 24P
   Micropower, High Accuracy Voltage References
REV. B
More results

유사한 설명 - ADR3440

제조업체부품명데이터시트상세설명
logo
Analog Devices
CN0221 AD-CN0221 Datasheet
418Kb / 5P
   Devices Connected
CN0216 AD-CN0216 Datasheet
603Kb / 5P
   Devices Connected
CN0385 AD-CN0385 Datasheet
532Kb / 13P
   Devices Connected
CN0253 AD-CN0253 Datasheet
135Kb / 4P
   Devices Connected
CN0357 AD-CN0357 Datasheet
223Kb / 5P
   Devices Connected
CN0388 AD-CN0388 Datasheet
503Kb / 5P
   Devices Connected
CN0269 AD-CN0269 Datasheet
1Mb / 12P
   Devices Connected
CN0267 AD-CN0267 Datasheet
336Kb / 8P
   Devices Connected
CN0326 AD-CN0326 Datasheet
519Kb / 7P
   Devices Connected
CN0336 AD-CN0336 Datasheet
301Kb / 7P
   Devices Connected
More results


Html Pages

1 2 3 4 5 6 7 8 9


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