D ts e t
aa h e
R c e t r lc r nc
o h se Ee to is
Ma u a t r dCo o e t
n fc u e
mp n n s
R c e tr b a d d c mp n ns ae
o h se rn e
o oet r
ma ua trd u ig ete dewaes
n fcue sn i r i/ fr
h
p rh s d f m te oiia s p l r
uc a e r
o h r n l u pi s
g
e
o R c e tr waes rce td f m
r o h se
fr e rae r
o
te oiia I. Al rce t n ae
h
r nl P
g
l e rai s r
o
d n wi tea p o a o teOC
o e t h p rv l f h
h
M.
P r aetse u igoiia fcoy
at r e td sn r n la tr
s
g
ts p o rmso R c e tr e eo e
e t rga
r o h se d v lp d
ts s lt n t g aa te p o u t
e t oui s o u rne
o
rd c
me t o e c e teOC d t s e t
es r x e d h
M aa h e.
Qu l yOv riw
ai
t
e ve
• IO- 0 1
S 90
•A 92 cr ct n
S 1 0 et ai
i
o
• Qu l e Ma ua trr Ls (
ai d
n fcues it QML MI- R -
) LP F
385
53
•C a sQ Mitr
ls
lay
i
•C a sVS a eL v l
ls
p c ee
• Qu l e S p l r Ls o D sr uos( L )
ai d u pi s it f it b tr QS D
e
i
•R c e trsacic l u pir oD A a d
o h se i
r ia s p l t L n
t
e
me t aln u t a dD A sa d r s
es lid sr n L tn ad .
y
R c e tr lcrnc , L i c mmi e t
o h se Ee t is L C s o
o
tdo
t
s p ligp o u t ta s t f c so r x e t-
u pyn rd cs h t ai y u tme e p ca
s
t n fr u lya daee u loto eoiial
i s o q ai n r q a t h s r n l
o
t
g
y
s p l db id sr ma ua trr.
u pi
e yn ut
y n fcues
T eoiia ma ua trr d ts e t c o a yn ti d c me t e e t tep r r n e
h r n l n fcue’ aa h e a c mp n ig hs o u n r cs h ef ma c
g
s
o
a ds e ic t n o teR c e tr n fcue v rino ti d vc . o h se Ee t n
n p c ai s f h o h se ma ua trd eso f hs e ie R c e tr lcr -
o
o
isg aa te tep r r n eo i s mio d co p o u t t teoiia OE s e ic -
c u rne s h ef ma c ft e c n u tr rd cs o h r n l M p c a
o
s
g
t n .T pc lv le aefr eee c p r o e o l. eti mii m o ma i m rt g
i s ‘y ia’ au s r o rfrn e up s s ny C r n nmu
o
a
r xmu ai s
n
ma b b s do p o u t h rceiain d sg , i lt n o s mpetsig
y e a e n rd c c aa tr t , e in smuai , r a l e t .
z o
o
n
© 2 1 R cetr l t n s LC Al i t R sre 0 1 2 1
0 3 ohs E cr i , L . lRg s eevd 7 1 0 3
e e oc
h
T l r m r, l s v iw wrcl . m
o e n oe p ae it w . e c o
a
e
s
o ec
Ultralow Noise, LDO XFET Voltage
References with Current Sink and Source
ADR440/ADR441/ADR443/ADR444/ADR445
FEATURES
Ultralow noise (0.1 Hz to 10 Hz)
ADR440: 1 μV p-p
ADR441: 1.2 μV p-p
ADR443: 1.4 μV p-p
ADR444: 1.8 μV p-p
ADR445: 2.25 μV p-p
Superb temperature coefficient
A grade: 10 ppm/°C
B grade: 3 ppm/°C
Low dropout operation: 500 mV
Input range: (V
OUT
+ 500 mV) to 18 V
High output source and sink current
+10 mA and −5 mA, respectively
Wide temperature range: −40°C to +125°C
PIN CONFIGURATIONS
TP
1
V
IN 2
NC
3
ADR440/
ADR441/
ADR443/
ADR444/
ADR445
8
7
6
5
TP
NC
V
OUT
TRIM
05428-001
05428-002
TOP VIEW
GND
4
(Not to Scale)
NOTES
1. NC = NO CONNECT
2. TP = TEST PIN (DO NOT CONNECT)
Figure 1. 8-Lead SOIC_N (R-Suffix)
TP
1
V
IN 2
NC
3
GND
4
ADR440/
ADR441/
ADR443/
ADR444/
ADR445
TOP VIEW
(Not to Scale)
8
7
6
5
TP
NC
V
OUT
TRIM
APPLICATIONS
Precision data acquisition systems
High resolution data converters
Battery-powered instrumentation
Portable medical instruments
Industrial process control systems
Precision instruments
Optical control circuits
NOTES
1. NC = NO CONNECT
2. TP = TEST PIN (DO NOT CONNECT)
Figure 2. 8-Lead MSOP (RM-Suffix)
GENERAL DESCRIPTION
The ADR44x series is a family of XFET® voltage references
featuring ultralow noise, high accuracy, and low temperature
drift performance. Using Analog Devices, Inc., patented
temperature drift curvature correction and XFET (eXtra
implanted junction FET) technology, voltage change vs.
temperature nonlinearity in the ADR44x is greatly minimized.
The XFET references offer better noise performance than
buried Zener references, and XFET references operate off
low supply voltage headroom (0.5 V). This combination of
features makes the ADR44x family ideally suited for precision
signal conversion applications in high-end data acquisition
systems, optical networks, and medical applications.
The ADR44x family has the capability to source up to 10 mA of
output current and sink up to −5 mA. It also comes with a trim
terminal to adjust the output voltage over a 0.5% range without
compromising performance.
Offered in two electrical grades, the ADR44x family is avail-
able in 8-lead MSOP and narrow SOIC packages. All versions
are specified over the extended industrial temperature range of
−40°C to +125°C.
Table 1. Selection Guide
Output
Voltage
(V)
2.048
2.048
2.500
2.500
3.000
3.000
4.096
4.096
5.000
5.000
Initial
Accuracy
(mV)
±3
±1
±3
±1
±4
±1.2
±5
±1.6
±6
±2
Temperature
Coefficient
(ppm/°C)
10
3
10
3
10
3
10
3
10
3
Model
ADR440A
ADR440B
ADR441A
ADR441B
ADR443A
ADR443B
ADR444A
ADR444B
ADR445A
ADR445B
Rev. E
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2005–2010 Analog Devices, Inc. All rights reserved.
ADR440/ADR441/ADR443/ADR444/ADR445
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Pin Configurations ........................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
ADR440 Electrical Characteristics............................................. 3
ADR441 Electrical Characteristics............................................. 4
ADR443 Electrical Characteristics............................................. 5
ADR444 Electrical Characteristics............................................. 6
ADR445 Electrical Characteristics............................................. 7
Absolute Maximum Ratings............................................................ 8
Thermal Resistance ...................................................................... 8
ESD Caution.................................................................................. 8
Typical Performance Characteristics ............................................. 9
Theory of Operation ...................................................................... 14
Power Dissipation Considerations........................................... 14
Basic Voltage Reference Connections ..................................... 14
Noise Performance ..................................................................... 14
Turn-On Time ............................................................................ 14
Applications Information .............................................................. 15
Output Adjustment .................................................................... 15
Bipolar Outputs .......................................................................... 15
Programmable Voltage Source ................................................. 15
Programmable Current Source ................................................ 16
High Voltage Floating Current Source .................................... 16
Precision Output Regulator (Boosted Reference)................. 16
Outline Dimensions ....................................................................... 17
Ordering Guide .......................................................................... 18
REVISION HISTORY
11/10—Rev. D to Rev. E
Deleted Negative Reference Section............................................. 15
Deleted Figure 37; Renumbered Sequentially ............................ 15
3/10—Rev. C to Rev. D
Changes to Figure 37...................................................................... 15
Updated Outline Dimensions ....................................................... 18
3/08—Rev. B to Rev. C
Changes to Table 8............................................................................ 8
Change to Figure 11 ....................................................................... 10
Changes to Figure 36...................................................................... 15
Changes to Figure 39...................................................................... 16
Changes to Figure 41...................................................................... 17
Updated Outline Dimensions ....................................................... 18
8/07—Rev. A to Rev. B
Change to Table 2, Ripple Rejection Ratio Specification ............ 3
Change to Table 3, Ripple Rejection Ratio Specification ............ 4
Change to Table 4, Ripple Rejection Ratio Specification ............ 5
Change to Table 5, Ripple Rejection Ratio Specification ............ 6
Change to Table 6, Ripple Rejection Ratio Specification ............ 7
9/06—Rev. 0 to Rev. A
Updated Format..................................................................Universal
Changes to Features ..........................................................................1
Changes to Pin Configurations .......................................................1
Changes to Specifications Section...................................................3
Changes to Figure 4 and Figure 5....................................................9
Inserted Figure 6 and Figure 7.........................................................9
Changes to Figure 15...................................................................... 11
Changes to Power Dissipation Considerations Section ............ 14
Changes to Figure 35 and Figure 36............................................. 15
Changes to Figure 38 and Table 9................................................. 16
Updated Outline Dimensions....................................................... 18
Changes to Ordering Guide .......................................................... 19
10/05—Revision 0: Initial Version
Rev. E | Page 2 of 20
ADR440/ADR441/ADR443/ADR444/ADR445
SPECIFICATIONS
ADR440 ELECTRICAL CHARACTERISTICS
V
IN
= 3 V to 18 V, T
A
= 25°C, C
IN
= C
OUT
= 0.1 μF, unless otherwise noted.
Table 2.
Parameter
OUTPUT VOLTAGE
A Grade
B Grade
INITIAL ACCURACY
A Grade
B Grade
TEMPERATURE DRIFT
A Grade
B Grade
LINE REGULATION
LOAD REGULATION
TCV
O
−40°C < T
A
< +125°C
−40°C < T
A
< +125°C
−40°C < T
A
< +125°C
I
LOAD
= 0 mA to 10 mA, V
IN
= 3.5 V,
−40°C < T
A
< +125°C
I
LOAD
= 0 mA to −5 mA, V
IN
= 3.5 V,
−40°C < T
A
< +125°C
No load, −40°C < T
A
< +125°C
0.1 Hz to 10 Hz
1 kHz
1000 hours
f
IN
= 1 kHz
3
500
2
1
+10
10
3
+20
+50
+50
3.75
ppm/°C
ppm/°C
ppm/V
ppm/mA
ppm/mA
mA
μV p-p
nV/√Hz
μs
ppm
ppm
dB
mA
V
mV
Symbol
V
O
Conditions
Min
2.045
2.047
V
OERR
3
0.15
1
0.05
mV
%
mV
%
Typ
2.048
2.048
Max
2.051
2.049
Unit
V
V
ΔV
O
/ΔV
IN
ΔV
O
/ΔI
LOAD
ΔV
O
/ΔI
LOAD
−20
−50
−50
QUIESCENT CURRENT
VOLTAGE NOISE
VOLTAGE NOISE DENSITY
TURN-ON SETTLING TIME
LONG-TERM STABILITY
1
OUTPUT VOLTAGE HYSTERESIS
RIPPLE REJECTION RATIO
SHORT CIRCUIT TO GND
SUPPLY VOLTAGE OPERATING RANGE
SUPPLY VOLTAGE HEADROOM
1
I
IN
e
N
p-p
e
N
t
R
V
O
V
O_HYS
RRR
I
SC
V
IN
V
IN
− V
O
3
1
45
10
50
70
−80
27
18
The long-term stability specification is noncumulative. The drift in the subsequent 1000-hour period is significantly lower than in the first 1000-hour period.
Rev. E | Page 3 of 20
ADR440/ADR441/ADR443/ADR444/ADR445
ADR441 ELECTRICAL CHARACTERISTICS
V
IN
= 3 V to 18 V, T
A
= 25°C, C
IN
= C
OUT
= 0.1 μF, unless otherwise noted.
Table 3.
Parameter
OUTPUT VOLTAGE
A Grade
B Grade
INITIAL ACCURACY
A Grade
B Grade
TEMPERATURE DRIFT
A Grade
B Grade
LINE REGULATION
LOAD REGULATION
TCV
O
−40°C < T
A
< +125°C
−40°C < T
A
< +125°C
−40°C < T
A
< +125°C
I
LOAD
= 0 mA to 10 mA, V
IN
= 4 V,
−40°C < T
A
< +125°C
I
LOAD
= 0 mA to −5 mA, V
IN
= 4 V,
−40°C < T
A
< +125°C
No load, −40°C < T
A
< +125°C
0.1 Hz to 10 Hz
1 kHz
1000 hours
f
IN
= 1 kHz
3
500
2
1
10
−50
−50
3
1.2
48
10
50
70
−80
27
10
3
20
+50
+50
3.75
ppm/°C
ppm/°C
ppm/V
ppm/mA
ppm/mA
mA
μV p-p
nV/√Hz
μs
ppm
ppm
dB
mA
V
mV
Symbol
V
O
Conditions
Min
2.497
2.499
V
OERR
3
0.12
1
0.04
mV
%
mV
%
Typ
2.500
2.500
Max
2.503
2.501
Unit
V
V
ΔV
O
/ΔV
IN
ΔV
O
/ΔI
LOAD
ΔV
O
/ΔI
LOAD
QUIESCENT CURRENT
VOLTAGE NOISE
VOLTAGE NOISE DENSITY
TURN-ON SETTLING TIME
LONG-TERM STABILITY
1
OUTPUT VOLTAGE HYSTERESIS
RIPPLE REJECTION RATIO
SHORT CIRCUIT TO GND
SUPPLY VOLTAGE OPERATING RANGE
SUPPLY VOLTAGE HEADROOM
1
I
IN
e
N
p-p
e
N
t
R
V
O
V
O_HYS
RRR
I
SC
V
IN
V
IN
− V
O
18
The long-term stability specification is noncumulative. The drift in subsequent 1000-hour period is significantly lower than in the first 1000-hour period.
Rev. E | Page 4 of 20
京公网安备 11010802033920号
EEWORLD
