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

X  

AD780ARZ-REEL7 数据表(PDF) 5 Page - Analog Devices

部件名 AD780ARZ-REEL7
功能描述  2.5 V-3.0 V High Precision Reference
Download  12 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

AD780ARZ-REEL7 数据表(HTML) 5 Page - Analog Devices

  AD780ARZ-REEL7 Datasheet HTML 1Page - Analog Devices AD780ARZ-REEL7 Datasheet HTML 2Page - Analog Devices AD780ARZ-REEL7 Datasheet HTML 3Page - Analog Devices AD780ARZ-REEL7 Datasheet HTML 4Page - Analog Devices AD780ARZ-REEL7 Datasheet HTML 5Page - Analog Devices AD780ARZ-REEL7 Datasheet HTML 6Page - Analog Devices AD780ARZ-REEL7 Datasheet HTML 7Page - Analog Devices AD780ARZ-REEL7 Datasheet HTML 8Page - Analog Devices AD780ARZ-REEL7 Datasheet HTML 9Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 5 / 12 page
background image
Data Sheet
AD780
Rev. F | Page 5 of 12
THEORY OF OPERATION
Band gap references are the high performance solution for low
supply voltage and low power voltage reference applications. In
this technique, a voltage with a positive temperature coefficient
is combined with the negative coefficient of a transistor’s Vbe to
produce a constant band gap voltage.
In the AD780, the band gap cell contains two NPN transistors
(Q6 and Q7) that differ in emitter area by 12×. The difference in
their Vbes produces a PTAT current in R5. This, in turn,
produces a PTAT voltage across R4 that, when combined with
the Vbe of Q7, produces a voltage (Vbg) that does not vary with
temperature. Precision laser trimming of the resistors and other
patented circuit techniques are used to further enhance the drift
performance.
R16
R10
+VIN
R4
R5
Q6
Q7
R11
R14
R13
R15
NC
VOUT
TRIM
GND
O/P SELECT
2.5V – NC
3.0V – GND
TEMP
NC
NC = NO CONNECT
AD780
7
2
1
3
4
8
5
6
Figure 4. Schematic Diagram
The output voltage of the AD780 is determined by the
configuration of Resistors R13, R14, and R15 in the amplifier’s
feedback loop. This sets the output to either 2.5 V or 3.0 V,
depending on whether R15 (Pin 8) is grounded or not
connected.
A unique feature of the AD780 is the low headroom design of
the high gain amplifier, which produces a precision 3 V output
from an input voltage as low as 4.5 V (or 2.5 V from a 4.0 V
input). The amplifier design also allows the part to work with
+VIN = VOUT when current is forced into the output terminal.
This allows the AD780 to work as a 2-terminal shunt regulator,
providing a −2.5 V or −3.0 V reference voltage output without
external components.
The PTAT voltage is also used to provide the user with a
thermometer output voltage (at Pin 3) that increases at a rate of
approximately 2 mV/°C.
The AD780’s NC (Pin 7) is a 20 kΩ resistor to +VIN that is used
solely for production test purposes. Users who are currently
using the LT1019 self-heater pin (Pin 7) must take into account
the different load on the heater supply.


类似零件编号 - AD780ARZ-REEL7

制造商部件名数据表功能描述
logo
Analog Devices
AD780ARZ-REEL7 AD-AD780ARZ-REEL7 Datasheet
264Kb / 12P
   2.5 V/3.0 V High Precision Reference
Rev. F
More results

类似说明 - AD780ARZ-REEL7

制造商部件名数据表功能描述
logo
Analog Devices
AD780BRZ-REEL7 AD-AD780BRZ-REEL7 Datasheet
264Kb / 12P
   2.5 V/3.0 V High Precision Reference
Rev. F
AD780 AD-AD780 Datasheet
178Kb / 10P
   2.5 V/3.0 V High Precision Reference
REV. B
AD780 AD-AD780_15 Datasheet
264Kb / 12P
   2.5 V/3.0 V High Precision Reference
Rev. F
AD780ARZ AD-AD780ARZ Datasheet
264Kb / 12P
   2.5 V/3.0 V High Precision Reference
Rev. F
AD580 AD-AD580 Datasheet
251Kb / 6P
   High Precision 2.5 V IC Reference
REV. A
5962-8686101XA AD-5962-8686101XA Datasheet
196Kb / 8P
   High Precision, 2.5 V IC Reference
REV. B
AD580MH AD-AD580MH Datasheet
196Kb / 8P
   High Precision,2.5 V IC Reference
REV. B
AD580 AD-AD580_04 Datasheet
196Kb / 8P
   High Precision, 2.5 V IC Reference
REV. B
AD580MH AD-AD580MH Datasheet
196Kb / 8P
   High Precision, 2.5 V IC Reference
REV. B
logo
List of Unclassifed Man...
AS535 ETC1-AS535 Datasheet
27Kb / 3P
   2.5 V Precision Reference / Amplifier
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


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