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PDF ADR444 Data sheet ( Hoja de datos )
| Número de pieza | ADR444 | |
| Descripción | (ADR440 - ADR445) LDO XFET Voltage References | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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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: (VOUT + 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
APPLICATIONS
Precision data acquisition systems
High resolution data converters
Battery-powered instrumentation
Portable medical instruments
Industrial process control systems
Precision instruments
Optical control circuits
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.
PIN CONFIGURATIONS
TP 1
VIN 2
NC 3
ADR440/
ADR441/
ADR443/
ADR444/
ADR445
8 TP
7 NC
6 VOUT
GND 4 TOP VIEW 5 TRIM
(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
VIN 2
NC 3
GND 4
ADR440/
ADR441/
ADR443/
ADR444/
ADR445
TOP VIEW
(Not to Scale)
8 TP
7 NC
6 VOUT
5 TRIM
NOTES
1. NC = NO CONNECT
2. TP = TEST PIN (DO NOT CONNECT)
Figure 2. 8-Lead MSOP (RM-Suffix)
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
Model
Output
Voltage
(V)
Initial
Accuracy
(mV)
ADR440A 2.048
±3
ADR440B 2.048
±1
ADR441A 2.500
±3
ADR441B 2.500
±1
ADR443A 3.000
±4
ADR443B 3.000
±1.2
ADR444A 4.096
±5
ADR444B 4.096
±1.6
ADR445A 5.000
±6
ADR445B 5.000
±2
Temperature
Coefficient
(ppm/°C)
10
3
10
3
10
3
10
3
10
3
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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.
1 page  
ADR440/ADR441/ADR443/ADR444/ADR445
ADR443 ELECTRICAL CHARACTERISTICS
VIN = 3.5 V to 18 V, TA = 25°C, CIN = COUT = 0.1 μF, unless otherwise noted.
Table 4.
Parameter
OUTPUT VOLTAGE
A Grade
B Grade
INITIAL ACCURACY
A Grade
B Grade
TEMPERATURE DRIFT
A Grade
B Grade
LINE REGULATION
LOAD REGULATION
QUIESCENT CURRENT
VOLTAGE NOISE
VOLTAGE NOISE DENSITY
TURN-ON SETTLING TIME
LONG-TERM STABILITY1
OUTPUT VOLTAGE HYSTERESIS
RIPPLE REJECTION RATIO
SHORT CIRCUIT TO GND
SUPPLY VOLTAGE OPERATING RANGE
SUPPLY VOLTAGE HEADROOM
Symbol
VO
Conditions
VOERR
TCVO
ΔVO/ΔVIN
ΔVO/ΔILOAD
ΔVO/ΔILOAD
IIN
eN p-p
eN
tR
VO
VO_HYS
RRR
ISC
VIN
VIN − VO
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
ILOAD = 0 mA to 10 mA, VIN = 5 V,
−40°C < TA < +125°C
ILOAD = 0 mA to −5 mA, VIN = 5 V,
−40°C < TA < +125°C
No load, −40°C < TA < +125°C
0.1 Hz to 10 Hz
1 kHz
1000 hours
fIN = 1 kHz
Min Typ Max Unit
2.996 3.000 3.004 V
2.9988 3.000 3.0012 V
4 mV
0.13 %
1.2 mV
0.04 %
2 10
13
10 20
ppm/°C
ppm/°C
ppm/V
−50 +50 ppm/mA
−50 +50 ppm/mA
3 3.75 mA
1.4 μV p-p
57.6 nV/√Hz
10 μs
50 ppm
70 ppm
−80 dB
27 mA
3.5 18 V
500 mV
1 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 5 of 20
5 Page 
50
VIN = 6V
40
ILOAD = 0mA TO +10mA
30
20
10
0
–10
–20
ILOAD = 0mA TO –5mA
–30
–40
–50
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Figure 15. ADR445 Load Regulation vs. Temperature
0.7
0.6
0.5
+125°C
0.4 +25°C
–40°C
0.3
0.2
0.1
0
–10 –5
0
5
LOAD CURRENT (mA)
Figure 16. ADR441 Minimum Input/Output
Differential Voltage vs. Load Current
10
0.5
NO LOAD
0.4
0.3
0.2
0.1
0
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Figure 17. ADR441 Minimum Headroom vs. Temperature
ADR440/ADR441/ADR443/ADR444/ADR445
1.0
0.9
0.8
0.7 +125°C
0.6
0.5 +25°C
0.4
0.3 –40°C
0.2
0.1
0
–5 0
5
LOAD CURRENT (mA)
Figure 18. ADR445 Minimum Input/Output
Differential Voltage vs. Load Current
10
0.5
NO LOAD
0.4
0.3
0.2
0.1
0
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Figure 19. ADR445 Minimum Headroom vs. Temperature
CIN = COUT = 0.1µF
VIN = 5V/DIV
VOUT = 1V/DIV
TIME = 10µs/DIV
Figure 20. ADR441 Turn-On Response
Rev. E | Page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ADR444.PDF ] | |
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