Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

ADR293GRU-REEL Datasheet(PDF) 8 Page - Analog Devices

Part # ADR293GRU-REEL
Description  Low Noise Micropower Precision Voltage Reference
Download  11 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADR293GRU-REEL Datasheet(HTML) 8 Page - Analog Devices

Back Button ADR293GRU-REEL Datasheet HTML 3Page - Analog Devices ADR293GRU-REEL Datasheet HTML 4Page - Analog Devices ADR293GRU-REEL Datasheet HTML 5Page - Analog Devices ADR293GRU-REEL Datasheet HTML 6Page - Analog Devices ADR293GRU-REEL Datasheet HTML 7Page - Analog Devices ADR293GRU-REEL Datasheet HTML 8Page - Analog Devices ADR293GRU-REEL Datasheet HTML 9Page - Analog Devices ADR293GRU-REEL Datasheet HTML 10Page - Analog Devices ADR293GRU-REEL Datasheet HTML 11Page - Analog Devices  
Zoom Inzoom in Zoom Outzoom out
 8 / 11 page
background image
ADR293
REV. 0
–8–
Device Power Dissipation Considerations
The ADR293 is guaranteed to deliver load currents to 5 mA
with an input voltage that ranges from 5.5 V to 15 V. When this
device is used in applications with large input voltages, care
should be exercised to avoid exceeding the published specifica-
tions for maximum power dissipation or junction temperature
that could result in premature device failure. The following
formula should be used to calculate a device’s maximum junc-
tion temperature or dissipation:
P
TT
D
A
A
=
J
J
θ
In this equation, TJ and TA are the junction and ambient tem-
peratures, respectively, PD is the device power dissipation, and
θ
JA is the device package thermal resistance.
Basic Voltage Reference Connections
References, in general, require a bypass capacitor connected
from the VOUT pin to the GND pin. The circuit in Figure 19
illustrates the basic configuration for the ADR293. Note that
the decoupling capacitors are not required for circuit stability.
ADR293
1
2
3
4
8
7
6
5
NC
NC
NC
NC
NC
OUTPUT
0.1 F
10 F
0.1 F
+
INPUT
NC = NO CONNECT
Figure 19. Basic Voltage Reference Configuration
Noise Performance
The noise generated by the ADR293 is typically less than
15
µVp-p over the 0.1 Hz to 10 Hz band. The noise measure-
ment is made with a bandpass filter made of a 2-pole high-pass
filter with a corner frequency at 0.1 Hz and a 2-pole low-pass
filter with a corner frequency at 10 Hz.
Turn-On Time
Upon application of power (cold start), the time required for the
output voltage to reach its final value within a specified error
band is defined as the turn-on settling time. Two components
normally associated with this are; the time for the active circuits
to settle, and the time for the thermal gradients on the chip to
stabilize. Figure 13 shows the typical turn-on time for the
ADR293.
THEORY OF OPERATION
The ADR293 uses a new reference generation technique known
as XFET, which yields a reference with low noise, low supply
current and very low thermal hysteresis.
The core of the XFET reference consists of two junction field-
effect transistors one of which has an extra channel implant to
raise its pinch-off voltage. By running the two JFETS at the
same drain current, the difference in pinch-off voltage can be
amplified and used to form a highly stable voltage reference.
The intrinsic reference voltage is around 0.5 V with a negative
temperature coefficient of about –120 ppm/K. This slope is
essentially locked to the dielectric constant of silicon and can be
closely compensated by adding a correction term generated in
the same fashion as the proportional-to-temperature (PTAT)
term used to compensate bandgap references. The big advan-
tage over a bandgap reference is that the intrinsic temperature
coefficient is some thirty times lower (therefore less correction is
needed) and this results in much lower noise since most of the
noise of a bandgap reference comes from the temperature com-
pensation circuitry.
The simplified schematic below shows the basic topology of the
ADR293. The temperature correction term is provided by a
current source with value designed to be proportional to abso-
lute temperature. The general equation is:
VV
RR
R
R
IR
OUT
P
PTAT
=
++


+
()( )
12
3
1
3
where
∆V
P is the difference in pinch-off voltage between the two
FETs and IPTAT is the positive temperature coefficient correction
current.
The process used for the XFET reference also features vertical
NPN and PNP transistors, the latter of which are used as output
devices to provide a very low drop-out voltage.
R1
R3
R2
R1
R3
I1
I1
IPTAT
VOUT
R1
R2
R3
VP
*EXTRA CHANNEL IMPLANT
*
VOUT
VP IPTAT
GND
VIN
Figure 18. Simplified Schematic


Similar Part No. - ADR293GRU-REEL

ManufacturerPart #DatasheetDescription
logo
Analog Devices
ADR293GRUZ AD-ADR293GRUZ Datasheet
261Kb / 12P
   Low Noise, Micropower 5.0 V Precision Voltage Reference
REV. D
ADR293GRUZ-REEL AD-ADR293GRUZ-REEL Datasheet
261Kb / 12P
   Low Noise, Micropower 5.0 V Precision Voltage Reference
REV. D
ADR293GRUZ-REEL7 AD-ADR293GRUZ-REEL7 Datasheet
261Kb / 12P
   Low Noise, Micropower 5.0 V Precision Voltage Reference
REV. D
More results

Similar Description - ADR293GRU-REEL

ManufacturerPart #DatasheetDescription
logo
Analog Devices
ADR293ERZ AD-ADR293ERZ Datasheet
261Kb / 12P
   Low Noise, Micropower 5.0 V Precision Voltage Reference
REV. D
ADR293 AD-ADR293_15 Datasheet
261Kb / 12P
   Low Noise, Micropower 5.0 V Precision Voltage Reference
REV. D
ADR293-EP AD-ADR293-EP Datasheet
182Kb / 12P
   Low Noise, Micropower 5.0 V Precision Voltage Reference
REV. 0
ADR293GRZ AD-ADR293GRZ Datasheet
261Kb / 12P
   Low Noise, Micropower 5.0 V Precision Voltage Reference
REV. D
logo
National Semiconductor ...
LM4130 NSC-LM4130 Datasheet
264Kb / 12P
   Precision Micropower Low Dropout Voltage Reference
logo
Texas Instruments
LM4125 TI-LM4125_15 Datasheet
988Kb / 18P
[Old version datasheet]   Precision Micropower Low Dropout Voltage Reference
logo
National Semiconductor ...
LM4121 NSC-LM4121 Datasheet
436Kb / 16P
   Precision Micropower Low Dropout Voltage Reference
LM4120 NSC-LM4120 Datasheet
289Kb / 11P
   Precision Micropower Low Dropout Voltage Reference
LM4125 NSC-LM4125 Datasheet
300Kb / 12P
   Precision Micropower Low Dropout Voltage Reference
logo
Texas Instruments
LM4120 TI1-LM4120 Datasheet
1Mb / 26P
[Old version datasheet]   Precision Micropower Low Dropout Voltage Reference
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
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