ADR3412ARJZ-R2 [ADI]
Micropower, High Accuracy Voltage References; 微功耗,高精度电压基准型号: | ADR3412ARJZ-R2 |
厂家: | ADI |
描述: | Micropower, High Accuracy Voltage References |
文件: | 总24页 (文件大小:895K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
Micropower, High Accuracy
Voltage References
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
FEATURES
PIN CONFIGURATION
Initial accuracy: 0.1ꢀ (maximum)
GND FORCE
GND SENSE
ENABLE
1
6
5
4
V
V
V
FORCE
OUT
OUT
IN
Maximum temperature coefficient: 8 ppm/°C
Operating temperature range: −40°C to +125°C
Output current: +10 mA source/−3 mA sink
Low quiescent current: 100 μA (maximum)
Low dropout voltage: 250 mV at 2 mA
Output noise (0.1 Hz to 10 Hz): <10 μV p-p at 1.2 V (typical)
6-lead SOT-23
ADR34xx
SENSE
2
3
TOP VIEW
(Not to Scale)
Figure 1. 6-Lead SOT-23
APPLICATIONS
Precision data acquisition systems
Industrial instrumentation
Medical devices
Battery-powered devices
GENERAL DESCRIPTION
Table 2. Voltage Reference Choices from Analog Devices
The ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/
ADR3440/ADR3450 are low cost, low power, high precision
CMOS voltage references, featuring 0ꢀ1ꢁ initial accuracy, low
operating current, and low output noise in a small SOT-23
packageꢀ For high accuracy, output voltage and temperature
coefficient are trimmed digitally during final assembly using
Analog Devices, Incꢀ, patented DigiTrim® technologyꢀ
High Voltage,
High Perfor-
mance
VOUT
(V)
Low Cost/
Low Power Power
Ultralow Low
Noise
0.5/1.0
1.2
ADR130
ADR3412
ADR280
2.048
2.5
ADR360
ADR3420
ADR3425
AD1582
ADR361
ADR3430
AD1583
ADR363
REF191
ADR430
ADR440
Stability and system reliability are further improved by the low
output voltage hysteresis of the device and low long-term output
voltage driftꢀ Furthermore, the low operating current of the
device (100 μA maximum) facilitates usage in low power
devices, and its low output noise helps maintain signal integrity
in critical signal processing systemsꢀ
ADR291 ADR431
REF192
ADR03
AD780
ADR441
ADR433
ADR443
3.0
REF193
ADR06
AD780
These CMOS are available in a wide range of output voltages, all
of which are specified over the industrial temperature range of
−40°C to +125°Cꢀ
3.3
ADR366
REF196
ADR3433
4.096
ADR3440
AD1584
ADR364
ADR3450
AD1585
ADR365
ADR292 ADR434
Table 1. Selection Guide
Model
Output Voltage (V)
Input Voltage Range (V)
2.3 to 5.5
2.3 to 5.5
2.7 to 5.5
3.2 to 5.5
3.5 to 5.5
4.3 to 5.5
5.2 to 5.5
REF198
ADR293 ADR435
REF195 ADR445
ADR444
ADR3412
ADR3420
ADR3425
ADR3430
ADR3433
ADR3440
ADR3450
1.200
2.048
2.500
3.000
3.300
4.096
5.000
5.0
ADR02
AD586
ADR01
AD587
10.0
Rev. B
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 registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2010 Analog Devices, Inc. All rights reserved.
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Pin Configuration............................................................................. 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
ADR3412 Electrical Characteristics .......................................... 3
ADR3420 Electrical Characteristics .......................................... 4
ADR3425 Electrical Characteristics .......................................... 5
ADR3430 Electrical Characteristics .......................................... 6
ADR3433 Electrical Characteristics .......................................... 7
ADR3440 Electrical Characteristics .......................................... 8
ADR3450 Electrical Characteristics .......................................... 9
ESD Caution................................................................................ 10
Pin Configuration and Function Descriptions........................... 11
Typical Performance Characteristics ........................................... 12
Terminology.................................................................................... 18
Theory of Operation ...................................................................... 19
Power Dissipation....................................................................... 19
Applications Information.............................................................. 20
Basic Voltage Reference Connection....................................... 20
Input and Output Capacitors.................................................... 20
4-Wire Kelvin Connections ...................................................... 20
VIN Slew Rate Considerations................................................... 20
Shutdown/Enable Feature ......................................................... 20
Sample Applications................................................................... 21
Outline Dimensions....................................................................... 22
Ordering Guide .......................................................................... 22
Absolute Maximum Ratings and Minimum Operating
Condition......................................................................................... 10
Thermal Resistance .................................................................... 10
REVISION HISTORY
6/10—Rev. A to Rev. B
Added ADR3430 Electrical Characteristics Section.....................4
Added Table 4; Renumbered Sequentially .....................................4
Added ADR3440 Electrical Characteristics Section and
Added ADR3412, ADR3420, ADR3433..................... Throughout
Changes to Table 1 and Table 2....................................................... 1
Added ADR3412 Electrical Characteristics Section
and Table 3......................................................................................... 3
Added ADR3420 Electrical Characteristics Section
and Table 4......................................................................................... 4
Added ADR3433 Electrical Characteristics Section and
Table 7, Renumbered Subsequent Tables ...................................... 7
Replaced Figure 5 Through Figure 7 ........................................... 12
Replaced Figure 11 Through Figure 13 ....................................... 13
Table 5 .................................................................................................5
Changes to Table 6.............................................................................6
Changes to Figure 2...........................................................................8
Changes to Figure 4 and Figure 5....................................................9
Changes to Figure 11...................................................................... 10
Changes to Figure 36 and Figure 37 Caption ............................. 14
Changes to Figure 39 and Theory of Operation Section .......... 16
Changes to Figure 40 and Figure 41............................................. 17
Changes to Negative Reference Section, Boosted Output
4/10—Rev. 0 to Rev. A
Current Reference Section, Figure 43, and Figure 44................ 18
Changes to Ordering Guide.......................................................... 19
Added ADR3430 and ADR3440.......................................Universal
Changes to Table 1, Table 2, and Figure 1 ..................................... 1
Changes to Table 3............................................................................ 3
3/10—Revision 0: Initial Version
Rev. B | Page 2 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
SPECIFICATIONS
ADR3412 ELECTRICAL CHARACTERISTICS
VIN = 2.3 V to 5.5 V, TA = 25°C, ILOAD = 0 mA, unless otherwise noted.
Table 3.
Parameter
Symbol
VOUT
Conditions
Min
Typ
Max
Unit
V
OUTPUT VOLTAGE
INITIAL ACCURACY
1.1988
1.2000 1.2012
VOERR
0.1
1.2
8
%
mV
TEMPERATURE COEFFICIENT
LINE REGULATION
TCVOUT
−40°C ≤ TA ≤ +125°C
ppm/°C
ppm/V
ppm/V
ΔVO/ΔVIN VIN = 2.3 V to 5.5 V
VIN = 2.3 V to 5.5 V, −40°C ≤ TA ≤ +125°C
7
50
160
LOAD REGULATION
Sourcing
ΔVO/ΔIL
IL = 0 mA to 10 mA,
VIN = 2.8 V, −40°C ≤ TA ≤ +125°C
IL = 0 mA to −3 mA,
14
7
30
50
ppm/mA
ppm/mA
Sinking
VIN = 2.8 V, −40°C ≤ TA ≤ +125°C
OUTPUT CURRENT CAPACITY
Sourcing
Sinking
IL
VIN = 2.8 V to 5.5 V
VIN = 2.8 V to 5.5 V
10
−3
mA
mA
QUIESCENT CURRENT
Normal Operation
IQ
ENABLE > VIN × 0.85
ENABLE = VIN, −40°C ≤ TA ≤ +125°C
ENABLE < 0.7 V
85
100
5
μA
μA
μA
V
Shutdown
DROPOUT VOLTAGE1
VDO
IL = 0 mA, −40°C ≤ TA ≤ +125°C
IL = 2 mA, −40°C ≤ TA ≤ +125°C
1
1
1.1
1.15
V
ENABLE PIN
Shutdown Voltage
ENABLE Voltage
ENABLE Pin Leakage Current
OUTPUT VOLTAGE NOISE
VL
VH
IEN
0
0.7
VIN
3
V
V
μA
VIN × 0.85
ENABLE = VIN, −40°C ≤ TA ≤ +125°C
f = 0.1 Hz to 10 Hz
f = 10 Hz to 10 kHz
f = 1 kHz
0.85
8
28
en p-p
μV p-p
μV rms
μV/√Hz
OUTPUT VOLTAGE NOISE
DENSITY
en
0.6
OUTPUT VOLTAGE HYSTERESIS2
RIPPLE REJECTION RATIO
LONG-TERM STABILITY
ΔVOUT_HYS TA = +25°C to −40°C to +125°C to +25°C
RRR fIN = 60 Hz
ΔVOUT_LTD 1000 hours at 50°C
tR
70
ppm
dB
−60
30
ppm
μs
TURN-ON SETTLING TIME
100
CIN = 0.1 μF, CL = 0.1 μF, RLoad = 1 kΩ
1 Refers to the minimum difference between VIN and VOUT such that VOUT maintains a minimum accuracy of 0.1%. See the Terminology section.
2 See the Terminology section. The part is placed through the temperature cycle in the order of temperatures shown.
Rev. B | Page 3 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
ADR3420 ELECTRICAL CHARACTERISTICS
VIN = 2.3 V to 5.5 V, TA = 25°C, ILOAD = 0 mA, unless otherwise noted.
Table 4.
Parameter
Symbol
VOUT
Conditions
Min
Typ
Max
Unit
V
OUTPUT VOLTAGE
INITIAL ACCURACY
2.0459
2.0480 2.0500
0.1
VOERR
%
2.048 mV
TEMPERATURE COEFFICIENT
LINE REGULATION
TCVOUT
−40°C ≤ TA ≤ +125°C
8
ppm/°C
ppm/V
ppm/V
ΔVO/ΔVIN
VIN = 2.3 V to 5.5 V
VIN = 2.3 V to 5.5 V, −40°C ≤ TA ≤ +125°C
7
50
160
LOAD REGULATION
Sourcing
ΔVO/ΔIL
IL = 0 mA to 10 mA,
VIN = 2.8 V, −40°C ≤ TA ≤ +125°C
IL = 0 mA to −3 mA,
12
7
30
50
ppm/mA
ppm/mA
Sinking
VIN = 2.8 V, −40°C ≤ TA ≤ +125°C
OUTPUT CURRENT CAPACITY
Sourcing
Sinking
IL
VIN = 2.8 V to 5.5 V
VIN = 2.8 V to 5.5 V
10
−3
mA
mA
QUIESCENT CURRENT
Normal Operation
IQ
ENABLE > VIN × 0.85
ENABLE = VIN, −40°C ≤ TA ≤ +125°C
ENABLE < 0.7 V
85
100
5
μA
μA
μA
mV
mV
Shutdown
DROPOUT VOLTAGE1
VDO
IL = 0 mA, −40°C ≤ TA ≤ +125°C
IL = 2 mA, −40°C ≤ TA ≤ +125°C
100
150
250
300
ENABLE PIN
Shutdown Voltage
ENABLE Voltage
ENABLE Pin Leakage Current
OUTPUT VOLTAGE NOISE
VL
VH
IEN
0
0.7
VIN
3
V
V
μA
VIN × 0.85
ENABLE = VIN, −40°C ≤ TA ≤ +125°C
f = 0.1 Hz to 10 Hz
f = 10 Hz to 10 kHz
f = 1 kHz
0.85
15
38
en p-p
μV p-p
μV rms
μV/√Hz
OUTPUT VOLTAGE NOISE
DENSITY
en
0.9
OUTPUT VOLTAGE HYSTERESIS2
RIPPLE REJECTION RATIO
LONG-TERM STABILITY
ΔVOUT_HYS
RRR
TA = +25°C to −40°C to +125°C to +25°C
fIN = 60 Hz
70
ppm
dB
−60
30
ΔVOUT_LTD
tR
1000 hours at 50°C
ppm
μs
TURN-ON SETTLING TIME
400
CIN = 0.1 μF, CL = 0.1 μF, RLoad = 1 kΩ
1 Refers to the minimum difference between VIN and VOUT such that VOUT maintains a minimum accuracy of 0.1%. See the Terminology section.
2 See the Terminology section. The part is placed through the temperature cycle in the order of temperatures shown.
Rev. B | Page 4 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
ADR3425 ELECTRICAL CHARACTERISTICS
VIN = 2.7 V to 5.5 V, IL = 0 mA, TA = 25°C, unless otherwise noted.
Table 5.
Parameter
Symbol
VOUT
Conditions
Min
Typ
Max
2.5025
0.1
Unit
V
OUTPUT VOLTAGE
INITIAL ACCURACY
2.4975
2.500
VOERR
%
2.5
mV
TEMPERATURE COEFFICIENT
LINE REGULATION
TCVOUT
−40°C ≤ TA ≤ +125°C
2.5
5
8
ppm/°C
ppm/V
ppm/V
ΔVO/ΔVIN
VIN = 2.7 V to 5.5 V
VIN = 2.7 V to 5.5 V, −40°C ≤ TA ≤ +125°C
50
120
LOAD REGULATION
Sourcing
ΔVO/ΔIL
IL = 0 mA to 10 mA,
VIN = 3.0 V, −40°C ≤ TA ≤ +125°C
IL = 0 mA to −3 mA,
10
10
30
50
ppm/mA
ppm/mA
Sinking
VIN = 3.0 V, −40°C ≤ TA ≤ +125°C
OUTPUT CURRENT CAPACITY
Sourcing
Sinking
IL
VIN = 3.0 V to 5.5 V
VIN = 3.0 V to 5.5 V
10
−3
mA
mA
QUIESCENT CURRENT
Normal Operation
IQ
ENABLE ≥ VIN × 0.85
ENABLE = VIN, −40°C ≤ TA ≤ +125°C
ENABLE ≤ 0.7 V
85
100
5
μA
μA
μA
mV
mV
Shutdown
DROPOUT VOLTAGE1
VDO
IL = 0 mA, TA = −40°C ≤ TA ≤ +125°C
IL = 2 mA, TA = −40°C ≤ TA ≤ +125°C
50
75
200
250
ENABLE PIN
Shutdown Voltage
ENABLE Voltage
ENABLE Pin Leakage Current
OUTPUT VOLTAGE NOISE
VL
VH
IEN
0
0.7
VIN
3
V
V
μA
VIN × 0.85
ENABLE = VIN, TA = −40°C ≤ TA ≤ +125°C
f = 0.1 Hz to 10 Hz
f = 10 Hz to 10 kHz
1
en p-p
18
42
1
μV p-p
μV rms
ꢀV/√Hz
OUTPUT VOLTAGE NOISE
DENSITY
en
f = 1 kHz
OUTPUT VOLTAGE HYSTERESIS2 ΔVOUT_HYS
TA = +25°C to −40°C to +125°C to +25°C
fIN = 60 Hz
70
ppm
dB
RIPPLE REJECTION RATIO
LONG-TERM STABILITY
TURN-ON SETTLING TIME
RRR
−60
30
ΔVOUT_LTD
tR
1000 hours at 50°C
ppm
μs
600
CIN = 0.1 μF, CL = 0.1 μF, RLoad = 1 kΩ
1 Refers to the minimum difference between VIN and VOUT such that VOUT maintains a minimum accuracy of 0.1%. See the Terminology section.
2 See the Terminology section. The part is placed through the temperature cycle in the order of temperatures shown.
Rev. B | Page 5 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
ADR3430 ELECTRICAL CHARACTERISTICS
VIN = 3.2 V to 5.5 V, IL = 0 mA, TA = 25°C, unless otherwise noted.
Table 6.
Parameter
Symbol
VOUT
Conditions
Min
Typ
Max
Unit
V
OUTPUT VOLTAGE
INITIAL ACCURACY
2.9970
3.0000 3.0030
VOERR
0.1
3.0
%
mV
TEMPERATURE COEFFICIENT
LINE REGULATION
TCVOUT
−40°C ≤ TA ≤ +125°C
2.5
5
8
ppm/°C
ppm/V
ppm/V
ΔVO/ΔVIN VIN = 3.2 V to 5.5 V
VIN = 3.2 V to 5.5 V, −40°C ≤ TA ≤ +125°C
50
120
LOAD REGULATION
Sourcing
ΔVO/ΔIL
IL = 0 mA to 10 mA,
VIN = 3.5 V, −40°C ≤ TA ≤ +125°C
IL = 0 mA to −3 mA,
9
30
50
ppm/mA
ppm/mA
Sinking
10
VIN = 3.5 V, −40°C ≤ TA ≤ +125°C
OUTPUT CURRENT CAPACITY
Sourcing
Sinking
IL
VIN = 3.5 V to 5.5 V
VIN = 3.5 V to 5.5 V
10
−3
mA
mA
QUIESCENT CURRENT
Normal Operation
IQ
ENABLE ≥ VIN × 0.85
ENABLE = VIN, −40°C ≤ TA ≤ +125°C
ENABLE ≤ 0.7 V
85
100
5
μA
μA
μA
mV
mV
Shutdown
DROPOUT VOLTAGE1
VDO
IL = 0 mA, TA = −40°C ≤ TA ≤ +125°C
IL = 2 mA, TA = −40°C ≤ TA ≤ +125°C
50
75
200
250
ENABLE PIN
Shutdown Voltage
ENABLE Voltage
ENABLE Pin Leakage Current
OUTPUT VOLTAGE NOISE
VL
VH
IEN
0
0.7
VIN
3
V
V
μA
VIN × 0.85
ENABLE = VIN, TA = −40°C ≤ TA ≤ +125°C
f = 0.1 Hz to 10 Hz
f = 10 Hz to 10 kHz
0.85
22
45
en p-p
μV p-p
μV rms
ꢀV/√Hz
ppm
dB
OUTPUT VOLTAGE NOISE DENSITY en
f = 1 kHz
1.1
70
OUTPUT VOLTAGE HYSTERESIS2
RIPPLE REJECTION RATIO
LONG-TERM STABILITY
ΔVOUT_HYS TA = +25°C to −40°C to +125°C to +25°C
RRR fIN = 60 Hz
ΔVOUT_LTD 1000 hours at 50°C
tR
−60
30
ppm
μs
TURN-ON SETTLING TIME
700
CIN = 0.1 μF, CL = 0.1 μF, RLoad = 1 kΩ
1 Refers to the minimum difference between VIN and VOUT such that VOUT maintains a minimum accuracy of 0.1%. See the Terminology section.
2 See the Terminology section. The part is placed through the temperature cycle in the order of temperatures shown.
Rev. B | Page 6 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
ADR3433 ELECTRICAL CHARACTERISTICS
VIN = 3.5 V to 5.5 V, IL = 0 mA, TA = 25°C, unless otherwise noted.
Table 7.
Parameter
Symbol
VOUT
Conditions
Min
Typ Max
Unit
V
OUTPUT VOLTAGE
INITIAL ACCURACY
3.2967
3.30 3.3033
VOERR
0.1
3.3
8
%
mV
TEMPERATURE COEFFICIENT
LINE REGULATION
TCVOUT
−40°C ≤ TA ≤ +125°C
ppm/°C
ppm/V
ppm/V
ΔVO/ΔVIN VIN = 3.5 V to 5.5 V
5
50
VIN = 3.5 V to 5.5 V, −40°C ≤ TA ≤ +125°C
120
LOAD REGULATION
Sourcing
ΔVO/ΔIL
IL = 0 mA to 10 mA,
VIN = 3.8 V, −40°C ≤ TA ≤ +125°C
IL = 0 mA to −3 mA,
9
30
50
ppm/mA
ppm/mA
Sinking
10
VIN = 3.8 V, −40°C ≤ TA ≤ +125°C
OUTPUT CURRENT CAPACITY
Sourcing
Sinking
IL
VIN = 3.8 V to 5.5 V
VIN = 3.8 V to 5.5 V
10
−3
mA
mA
QUIESCENT CURRENT
Normal Operation
IQ
ENABLE > VIN × 0.85
ENABLE = VIN, −40°C ≤ TA ≤ +125°C
ENABLE < 0.7 V
85
100
5
μA
μA
μA
mV
mV
Shutdown
DROPOUT VOLTAGE1
VDO
IL = 0 mA, −40°C ≤ TA ≤ +125°C
IL = 2 mA, −40°C ≤ TA ≤ +125°C
50
75
200
250
ENABLE PIN
Shutdown Voltage
ENABLE Voltage
ENABLE Pin Leakage Current
OUTPUT VOLTAGE NOISE
VL
VH
IEN
0
0.7
VIN
3
V
V
μA
VIN × 0.85
ENABLE = VIN, −40°C ≤ TA ≤ +125°C
f = 0.1 Hz to 10 Hz
f = 10 Hz to 10 kHz
f = 1 kHz
0.85
25
46
en p-p
μV p-p
μV rms
μV/√Hz
ppm
dB
OUTPUT VOLTAGE NOISE DENSITY en
1.2
70
OUTPUT VOLTAGE HYSTERESIS2
RIPPLE REJECTION RATIO
LONG-TERM STABILITY
ΔVOUT_HYS TA = +25°C to −40°C to +125°C to +25°C
RRR fIN = 60 Hz
ΔVOUT_LTD 1000 hours at 50°C
tR
-60
30
ppm
μs
TURN-ON SETTLING TIME
750
CIN = 0.1 μF, CL = 0.1 μF, RLoad = 1 kΩ
1 Refers to the minimum difference between VIN and VOUT such that VOUT maintains a minimum accuracy of 0.1%. See the Terminology section.
2 See the Terminology section. The part is placed through the temperature cycle in the order of temperatures shown.
Rev. B | Page 7 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
ADR3440 ELECTRICAL CHARACTERISTICS
VIN = 4.3 V to 5.5 V, IL = 0 mA, TA = 25°C, unless otherwise noted.
Table 8.
Parameter
Symbol
VOUT
Conditions
Min
Typ
Max
4.1000
0.1
Unit
V
OUTPUT VOLTAGE
INITIAL ACCURACY
4.0919
4.0960
VOERR
%
4.096
8
mV
TEMPERATURE COEFFICIENT
LINE REGULATION
TCVOUT
−40°C ≤ TA ≤ +125°C
2.5
3
ppm/°C
ppm/V
ppm/V
ΔVO/ΔVIN
VIN = 4.3 V to 5.5 V
VIN = 4.3 V to 5.5 V, −40°C ≤ TA ≤ +125°C
50
120
LOAD REGULATION
Sourcing
ΔVO/ΔIL
IL = 0 mA to 10 mA,
VIN = 4.6 V, −40°C ≤ TA ≤ +125°C
IL = 0 mA to −3 mA,
6
30
50
ppm/mA
ppm/mA
Sinking
15
VIN = 4.6 V, −40°C ≤ TA ≤ +125°C
OUTPUT CURRENT CAPACITY
Sourcing
Sinking
IL
VIN = 4.6 V to 5.5 V
VIN = 4.6 V to 5.5 V
10
−3
mA
mA
QUIESCENT CURRENT
Normal Operation
IQ
ENABLE ≥ VIN × 0.85
ENABLE = VIN, −40°C ≤ TA ≤ +125°C
ENABLE ≤ 0.7 V
85
100
5
μA
μA
μA
mV
mV
Shutdown
DROPOUT VOLTAGE1
VDO
IL = 0 mA, TA = −40°C ≤ TA ≤ +125°C
IL = 2 mA, TA = −40°C ≤ TA ≤ +125°C
50
75
200
250
ENABLE PIN
Shutdown Voltage
ENABLE Voltage
ENABLE Pin Leakage Current
OUTPUT VOLTAGE NOISE
VL
VH
IEN
0
0.7
VIN
3
V
V
μA
VIN × 0.85
ENABLE = VIN, TA = −40°C ≤ TA ≤ +125°C
f = 0.1 Hz to 10 Hz
f = 10 Hz to 10 kHz
en p-p
29
53
1.4
μV p-p
μV rms
ꢀV/√Hz
OUTPUT VOLTAGE NOISE
DENSITY
en
f = 1 kHz
OUTPUT VOLTAGE HYSTERESIS2 ΔVOUT_HYS
TA = +25°C to −40°C to +125°C to +25°C
fIN = 60 Hz
70
ppm
dB
RIPPLE REJECTION RATIO
LONG-TERM STABILITY
TURN-ON SETTLING TIME
RRR
−60
30
ΔVOUT_LTD
tR
1000 hours at 50°C
ppm
μs
800
CIN = 0.1 μF, CL = 0.1 μF, RLoad = 1 kΩ
1 Refers to the minimum difference between VIN and VOUT such that VOUT maintains a minimum accuracy of 0.1%. See the Terminology section.
2 See the Terminology section. The part is placed through the temperature cycle in the order of temperatures shown.
Rev. B | Page 8 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
ADR3450 ELECTRICAL CHARACTERISTICS
VIN = 5.2 V to 5.5 V, IL = 0 mA, TA = 25°C, unless otherwise noted.
Table 9.
Parameter
Symbol
VOUT
Conditions
Min
Typ
Max
5.0050
0.1
Unit
V
OUTPUT VOLTAGE
INITIAL ACCURACY
4.9950
5.0000
VOERR
%
5.0
mV
TEMPERATURE COEFFICIENT
LINE REGULATION
TCVOUT
−40°C ≤ TA ≤ +125°C
2.5
3
8
ppm/°C
ppm/V
ppm/V
ΔVO/ΔVIN
VIN = 5.2 V to 5.5 V
VIN = 5.2 V to 5.5 V, −40°C ≤ TA ≤ +125°C
50
120
LOAD REGULATION
Sourcing
ΔVO/ΔIL
IL = 0 mA to 10 mA,
VIN = 5.5 V, −40°C ≤ TA ≤ +125°C
IL = 0 mA to −3 mA,
3
30
50
ppm/mA
ppm/mA
Sinking
19
VIN = 5.5 V, −40°C ≤ TA ≤ +125°C
OUTPUT CURRENT CAPACITY
Sourcing
Sinking
IL
VIN = 5.5 V
VIN = 5.5 V
10
−3
mA
mA
QUIESCENT CURRENT
Normal Operation
IQ
ENABLE ≥ VIN × 0.85
ENABLE = VIN, −40°C ≤ TA ≤ +125°C
ENABLE ≤ 0.7 V
85
100
5
μA
μA
μA
mV
mV
Shutdown
DROPOUT VOLTAGE1
VDO
IL = 0 mA, TA = −40°C ≤ TA ≤ +125°C
IL = 2 mA, TA = −40°C ≤ TA ≤ +125°C
50
75
200
250
ENABLE PIN
Shutdown Voltage
ENABLE Voltage
ENABLE Pin Leakage Current
OUTPUT VOLTAGE NOISE
VL
VH
IEN
0
0.7
VIN
3
V
V
μA
VIN × 0.85
ENABLE = VIN, TA = −40°C ≤ TA ≤ +125°C
f = 0.1 Hz to 10 Hz
f = 10 Hz to 10 kHz
1
en p-p
35
60
1.5
μV p-p
μV rms
ꢀV/√Hz
OUTPUT VOLTAGE NOISE
DENSITY
en
f = 1 kHz
OUTPUT VOLTAGE HYSTERESIS2 ΔVOUT_HYS
TA = +25°C to −40°C to +125°C to +25°C
fIN = 60 Hz
70
ppm
dB
RIPPLE REJECTION RATIO
LONG-TERM STABILITY
TURN-ON SETTLING TIME
RRR
−58
30
ΔVOUT_LTD
tR
1000 hours at 50°C
ppm
ꢀs
900
CIN = 0.1 μF, CL = 0.1 μF, RLoad = 1 kΩ
1 Refers to the minimum difference between VIN and VOUT such that VOUT maintains a minimum accuracy of 0.1%. See the Terminology section.
2 See the Terminology section. The part is placed through the temperature cycle in the order of temperatures shown.
Rev. B | Page 9 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
ABSOLUTE MAXIMUM RATINGS AND MINIMUM OPERATING CONDITION
TA = 25°C, unless otherwise noted.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 10.
Parameter
Rating
Supply Voltage
6 V
VIN
0.1 V/ms
−40°C to +125°C
−65°C to +125°C
−65°C to +150°C
Table 11. Thermal Resistance
Package Type
ENABLE to GND SENSE Voltage
VIN Minimum Slew Rate
Operating Temperature Range
Storage Temperature Range
Junction Temperature Range
θJA
θJC
Unit
6-Lead SOT-23 (RJ-6)
230
92
°C/W
ESD CAUTION
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Rev. B | Page 10 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
GND FORCE
1
6
V
FORCE
OUT
OUT
IN
ADR34xx
5
4
V
V
SENSE
GND SENSE
ENABLE
2
3
TOP VIEW
(Not to Scale)
Figure 2. Pin Configuration
Table 12. Pin Function Descriptions
Pin No.
Mnemonic
GND FORCE
GND SENSE
ENABLE
Description
Ground Force Connection.1
1
2
3
4
5
6
Ground Voltage Sense Connection. Connect directly to the point of lowest potential in the application.1
Enable Connection. Enables or disables the device.
Input Voltage Connection.
Reference Voltage Output Sensing Connection. Connect directly to the voltage input of the load devices.1
Reference Voltage Output.1
VIN
VOUT SENSE
VOUT FORCE
1 See the Applications Information section for more information on force/sense connections.
Rev. B | Page 11 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, unless otherwise noted.
2.5010
2.5008
2.5006
2.5004
2.5002
2.5000
2.4998
2.4996
2.4994
2.4992
2.4990
5.0025
5.0020
5.0015
5.0010
5.0005
5.0000
4.9995
4.9990
4.9985
4.9980
4.9975
V
= 5.5V
V
= 5.5V
IN
IN
–40 –25 –10
5
20
35
50
65
80
95 110 125
–40 –25 –10
5
20
35
50
65
80
95 110 125
TEMPERATURE (ºC)
TEMPERATURE (ºC)
Figure 3. ADR3425 Output Voltage vs. Temperature
Figure 6. ADR3450 Output Voltage vs. Temperature
40
35
30
25
20
15
10
5
45
40
35
30
25
20
15
10
5
0
0
0
1
2
3
4
5
6
7
8
9
10
11
0
1
2
3
4
5
6
7
8
9
10 MORE
TEMPERATURE COEFFICIENT (ppm/°C)
TEMPERATURE COEFFICIENT (ppm/°C)
Figure 4. ADR3425 Temperature Coefficient Distribution
Figure 7. ADR3450 Temperature Coefficient Distribution
24
22
35
ADR3412
ADR3420
ADR3425
ADR3430
ADR3433
ADR3412
ADR3420
ADR3425
ADR3430
ADR3433
I
= 0mA TO +10mA
I
= 0mA TO –3mA
L
L
20
18
16
14
12
10
8
30
SOURCING
SINKING
ADR3440
ADR3450
ADR3440
ADR3450
25
20
15
10
5
6
4
2
0
–40 –25 –10
5
20
35
50
65
80
95 110 125
–40 –25 –10
5
20
35
50
65
80
95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 5. Load Regulation vs. Temperature (Sourcing)
Figure 8. Load Regulation vs. Temperature (Sinking)
Rev. B | Page 12 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
400
–40°C
+25°C
+125°C
350
300
T
T
T
= –40°C
= +25°C
= +125°C
A
A
A
250
200
150
100
50
0
–3 –2 –1
0
1
2
3
4
5
6
7
8
9
10
–3 –2 –1
0
1
2
3
4
5
6
7
8
9
10
LOAD CURRENT (mA)
LOAD CURRENT (mA)
Figure 9. ADR3412 Dropout Voltage vs. Load Current
Figure 12. ADR3425 Dropout Voltage vs. Load Current
450
400
350
300
250
200
150
100
50
350
300
250
200
150
100
50
–40°C
+25°C
+125°C
T
T
T
= –40°C
= +25°C
= +125°C
A
A
A
0
–50
–3 –2 –1
0
0
1
2
3
4
5
6
7
8
9
10
–3 –2 –1
0
1
2
3
4
5
6
7
8
9
10
LOAD CURRENT (mA)
LOAD CURRENT (mA)
Figure 13. ADR3450 Dropout Voltage vs. Load Current
Figure 10. ADR3420 Dropout Voltage vs. Load Current
140
120
100
80
ADR3412
ADR3420
ADR3425
ADR3430
ADR3433
FREQUENCY GEN = 1Hz
V
C
R
= 2V/DIV
IN
ADR3440
ADR3450
= C = 0.1µF
IN OUT
= 1kΩ
L
2
60
V
= 500mV/DIV
OUT
40
20
1
0
CH1 500mV
CH2 2.00V
M100µs
A
CH2
2.36V
–40 –25 –10
5
20
35
50
65
80
95 110 125
TEMPERATURE (°C)
Figure 11. ADR3412 Start-Up (Turn-On Settle) Time
Figure 14. Line Regulation vs. Temperature
Rev. B | Page 13 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
0
C
C
= 1.1µF
L
–10
–20
–30
–40
–50
–60
–70
–80
= 0.1µF
IN
1
10µV/DIV
TIME = 1s/DIV
CH1 RMS = 3.14µV
–90
CH1 pk-pk = 18µV
10
100
1k
10k
100k
FREQUENCY (Hz)
Figure 15. ADR3425 Output Voltage Noise (0.1 Hz to 10 Hz)
Figure 18. ADR3425 Ripple Rejection Ratio vs. Frequency
C
R
= C = 0.1µF
L
IN
L
=
∞
1
V
IN
= 2V/DIV
1
100µV/DIV
TIME = 200µs/DIV
2
V
OUT
= 1V/DIV
TIME = 1s/DIV
CH1 pk-pk = 300µV
CH1 RMS = 42.0µV
Figure 16. ADR3425 Output Voltage Noise (10 Hz to 10 kHz)
Figure 19. ADR3425 Start-Up Response
12
10
8
ENABLE
V
V
C
= 1V/DIV
ENABLE
= 3.0v
IN
= C = 0.1µF
IN
L
L
R
=
∞
1
6
4
V
= 1V/DIV
OUT
TIME = 200µs/DIV
2
2
0
0.1
1
10
100
1k
10k
FREQUENCY (Hz)
Figure 17. ADR3425 Output Noise Spectral Density
Figure 20. ADR3425 Restart Response from Shutdown
Rev. B | Page 14 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
0
C
C
= 1.1µF
L
–10
–20
–30
–40
–50
–60
–70
–80
= 0.1µF
IN
1
10µV/DIV
–90
CH1 pk-pk = 33.4µV
CH1 RMS = 5.68µV
10
100
1k
10k
100k
FREQUENCY (Hz)
Figure 21. ADR3450 Output Voltage Noise (0.1 Hz to 10 Hz)
Figure 24. ADR3450 Ripple Rejection Ratio vs. Frequency
C
C
R
= 0µF
= 0.1µF
IN
L
L
=
∞
V
IN
2V/DIV
1
1
V
OUT
2V/DIV
TIME = 200µs/DIV
100µV/DIV
2
CH1 pk-pk = 446µV
CH1 RMS = 60.3µV
Figure 22. ADR3450 Output Voltage Noise (10 Hz to 10 kHz)
Figure 25. ADR3450 Start-Up Response
12
10
8
ENABLE
V
V
C
R
= 2V/DIV
ENABLE
= 5.5V
IN
= C = 0.1µF
IN
L
L
1
=
∞
6
V
= 2V/DIV
OUT
4
TIME = 200µs/DIV
2
2
0
0.1
1
10
100
1k
10k
FREQUENCY (Hz)
Figure 23. ADR3450 Output Noise Spectral Density
Figure 26. ADR3450 Restart Response from Shutdown
Rev. B | Page 15 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
ENABLE
1V/DIV
ENABLE
2V/DIV
C
= C = 0.1µF
L
= 5V
= 1kΩ
IN
IN
C
= C = 0.1µF
L
= 3V
= 1kΩ
IN
V
R
V
R
IN
L
L
1
1
V
= 1V/DIV
V
= 2V/DIV
OUT
2
OUT
2
TIME = 200µs/DIV
TIME = 200µs/DIV
Figure 27. ADR3425 Shutdown Response
Figure 30. ADR3450 Shutdown Response
V
= 100mV/DIV
IN
5.5V
5.2V
3.2V
2.7V
C
= C = 0.1µF
L
IN
1
500mV/DIV
C
= C = 0.1µF
L
IN
2
V
= 10mV/DIV
OUT
2
V
= 5mV/DIV
OUT
TIME = 1ms/DIV
TIME = 1ms/DIV
1
Figure 28. ADR3425 Line Transient Response
Figure 31. ADR3450 Line Transient Response
I
L
+10mA
–3mA
SOURCING
SOURCING
SINKING
I
+10mA
–3mA
L
SINKING
SINKING
SINKING
C
C
R
=
=
0.1µF
0.1µF
= 500Ω
IN
C
C
R
=
=
0.1µF
0.1µF
= 250Ω
IN
L
L
L
L
5.0V
2.5V
V
= 20mV/DIV
V
= 20mV/DIV
OUT
OUT
TIME = 1ms/DIV
TIME = 1ms/DIV
Figure 29. ADR3425 Load Transient Response
Figure 32. ADR3450 Load Transient Response
Rev. B | Page 16 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
7
6
5
4
3
2
1
0
100
90
80
70
60
50
40
30
20
10
0
V
= 5.5 V
IN
–40 –25 –10
5
20
35
50
65
80
95 110 125
TEMPERATURE (°C)
RELATIVE SHIFT IN V
OUT
(%)
Figure 33. Supply Current vs. Temperature
Figure 36. Output Voltage Drift Distribution After Reflow (SHR Drift)
2.0
8
T
= +25°C → +150°C → –50°C → +25°C
A
–40°C
+25°C
+125°C
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
7
6
5
4
3
2
1
0
0
0
10
20
30
40
50
60
70
80
90
100
ENABLE VOLTAGE (% of V
)
IN
OUTPUT VOLTAGE HYSTERESIS (ppm)
Figure 37. ADR3450 Thermally Induced Output Voltage Hysteresis Distribution
Figure 34. Supply Current vs. ENABLE Pin Voltage
80
10
C
C
= 0.1µF
= 1.1µF
L
L
60
40
1
20
0
–20
–40
–60
–80
0.1
0.01
0
200
400
600
800
1000
0.01
0.1
1
10
100
1k
10k
ELAPSED TIME (Hours)
FREQUENCY (Hz)
Figure 35. ADR3450 Output Impedance vs. Frequency
Figure 38. ADR3450 Typical Long-Term Output Voltage Drift
(Four Devices, 1000 Hours)
Rev. B | Page 17 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
TERMINOLOGY
ΔVOUT _ HYS =VOUT (25°C) −VOUT _ TC [V]
OUT (25°C) −VOUT _ TC
Dropout Voltage (VDO
)
Dropout voltage, sometimes referred to as supply voltage
headroom or supply-output voltage differential, is defined as
the minimum voltage differential between the input and output
such that the output voltage is maintained to within 0.1%
accuracy.
V
ΔVOUT _ HYS
=
×106 [ppm]
V
OUT (25°C)
where:
V
V
OUT(25°C) is the output voltage at 25°C.
OUT_TC is the output voltage after temperature cycling.
V
DO = (VIN − VOUT)min | IL = constant
Long-Term Stability (ΔVOUT_LTD
)
Because the dropout voltage depends upon the current passing
through the device, it is always specified for a given load current.
In series-mode devices, dropout voltage typically increases
proportionally to load current (see Figure 8 and Figure 14).
Long-term stability refers to the shift in output voltage at 50°C
after 1000 hours of operation in a 50°C environment. Ambient
temperature is kept at 50°C to ensure that the temperature
chamber does not switch randomly between heating and cooling,
which can cause instability over the 1000 hour measurement.
This is also expressed as either a shift in voltage or a difference
in ppm from the nominal output.
Temperature Coefficient (TCVOUT
)
The temperature coefficient relates the change in output voltage
to the change in ambient temperature of the device, as normalized
by the output voltage at 25°C. This parameter is expressed in
ppm/°C and can be determined by the following equation:
ΔVOUT _ LTD = VOUT (t1 ) − VOUT (t0 ) [V]
VOUT (t1 ) −VOUT (t0 )
max{VOUT (T1 ,T2 ,T3 )}− min{VOUT (T1 ,T2 ,T3 )}
ΔVOUT _ LTD
=
×106 [ppm]
TCVOUT
=
×
VOUT (T2 ) × (T3 − T1 )
106 [ppm/ °C]
VOUT (t0 )
where:
VOUT(t0) is the VOUT at 50°C at Time 0.
(1)
VOUT(t1) is the VOUT at 50°C after 1000 hours of operation
at 50°C.
where:
VOUT(T) is the output voltage at Temperature T.
T1 = −40°C.
T2 = +25°C.
T3 = +125°C.
Line Regulation
Line regulation refers to the change in output voltage in response
to a given change in input voltage and is expressed in percent
per volt, ppm per volt, or μV per volt change in input voltage.
This parameter accounts for the effects of self-heating.
This three-point method ensures that TCVOUT accurately
portrays the maximum difference between any of the three
temperatures at which the output voltage of the part is
measured.
Load Regulation
Load regulation refers to the change in output voltage in
response to a given change in load current and is expressed in
μV per mA, ppm per mA, or ohms of dc output resistance. This
parameter accounts for the effects of self-heating.
The TCVOUT for the ADR3412/ADR3425/ADR3430/ADR3433/
ADR3440/ADR3450 is guaranteed via statistical means. This is
accomplished by recording output voltage data for a large
number of units over temperature, computing TCVOUT for each
individual device via Equation 1, then defining the maximum
TCVOUT limits as the mean TCVOUT for all devices extended by
six standard deviations (6σ).
Solder Heat Resistance (SHR) Drift
SHR drift refers to the permanent shift in output voltage
induced by exposure to reflow soldering, expressed in units of
ppm. This is caused by changes in the stress exhibited upon the
die by the package materials when exposed to high tempera-
tures. This effect is more pronounced in lead-free soldering
processes due to higher reflow temperatures.
Thermally Induced Output Voltage Hysteresis (ΔVOUT_HYS
Thermally induced output voltage hysteresis represents the
change in output voltage after the device is exposed to a
)
specified temperature cycle. This is expressed as either a shift in
voltage or a difference in ppm from the nominal output.
Rev. B | Page 18 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
THEORY OF OPERATION
V
IN
LONG-TERM STABILITY
One of the key parameters of the ADR34xx references is long-
term stability. Regardless of output voltage, internal testing
during development showed a typical drift of approximately
30 ppm after 1000 hours of continuous, nonloaded operation
in a 50°C environment.
BAND GAP
VOLTAGE
REFERENCE
V
BG
ENABLE
V
V
FORCE
SENSE
OUT
OUT
R
FB1
GND FORCE
It is important to understand that long-term stability is not
guaranteed by design and that the output from the device may
shift beyond the typical 30 ppm specification at any time,
especially during the first 200 hours of operation. For systems
that require highly stable output voltages over long periods of
time, the designer should consider burning in the devices prior
to use to minimize the amount of output drift exhibited by the
reference over time. See the AN-713 Application Note, The
Effect of Long-Term Drift on Voltage References, at www.analog.com
for more information regarding the effects of long-term drift
and how it can be minimized.
R
FB2
GND SENSE
Figure 39. Block Diagram
The ADR3412/ADR3425/ADR3430/ADR3433/ADR3440/
ADR3450 use a patented voltage reference architecture to
achieve high accuracy, low temperature coefficient (TC), and
low noise in a CMOS process. Like all band gap references, the
references combine two voltages of opposite TCs to create an
output voltage that is nearly independent of ambient temper-
ature. However, unlike traditional band gap voltage references, the
temperature-independent voltage of the references are arranged
to be the base-emitter voltage, VBE, of a bipolar transistor at
room temperature rather than the VBE extrapolated to 0 K (the
VBE of bipolar transistor at 0 K is approximately VG0, the band
gap voltage of silicon). A corresponding positive-TC voltage is
then added to the VBE voltage to compensate for its negative TC.
POWER DISSIPATION
The ADR34xx voltage references are capable of sourcing up to
10 mA of load current at room temperature across the rated
input voltage range. However, when used in applications subject
to high ambient temperatures, the input voltage and load cur-
rent should be carefully monitored to ensure that the device
does not exceeded its maximum power dissipation rating. The
maximum power dissipation of the device can be calculated via
the following equation:
The key benefit of this technique is that the trimming of the
initial accuracy and TC can be performed without interfering
with one another, thereby increasing overall accuracy across
temperature. Curvature correction techniques further reduce
the temperature variation.
TJ − TA
PD =
[W]
θJA
where:
The band gap voltage (VBG) is then buffered and amplified to
produce stable output voltages of 2.5 V and 5.0 V. The output
buffer can source up to 10 mA and sink up to −3 mA of load
current.
PD is the device power dissipation.
TJ is the device junction temperature.
TA is the ambient temperature.
θJA is the package (junction-to-air) thermal resistance.
The ADR34xx family leverages Analog Devices patented
DigiTrim technology to achieve high initial accuracy and low
TC, and precision layout techniques lead to very low long-term
drift and thermal hysteresis.
Because of this relationship, acceptable load current in high
temperature conditions may be less than the maximum current-
sourcing capability of the device. In no case should the part be
operated outside of its maximum power rating because doing so
can result in premature failure or permanent damage to the device.
Rev. B | Page 19 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
APPLICATIONS INFORMATION
voltages can be sensed accurately. These voltages are fed back
BASIC VOLTAGE REFERENCE CONNECTION
V
into the internal amplifier and used to automatically correct for
the voltage drop across the current-carrying output and ground
lines, resulting in a highly accurate output voltage across the
load. To achieve the best performance, the sense connections
should be connected directly to the point in the load where the
output voltage should be the most accurate. See Figure 41 for an
example application.
OUT
2.5V
V
IN
4
6
V
V
FORCE
SENSE
2.7V TO
5.5V
IN
ENABLE
OUT
3
5
V
OUT
0.1µF
1µF
0.1µF
ADR34xx
2
1
GND SENSE
GND FORCE
OUTPUT CAPACITOR(S) SHOULD
BE MOUNTED AS CLOSE
Figure 40. Basic Reference Connection
TO V
FORCE PIN AS POSSIBLE.
OUT
The circuit shown in Figure 40 illustrates the basic configuration
for the ADR34xx references. Bypass capacitors should be
connected according to the following guidelines.
0.1µF
6
4
V
V
V
FORCE
IN
IN
OUT
3
5
ENABLE
V
SENSE
OUT
INPUT AND OUTPUT CAPACITORS
SENSE CONNECTIONS
SHOULD CONNECT AS
CLOSE TO LOAD
LOAD
A 1 μF to 10 μF electrolytic or ceramic capacitor can be
connected to the input to improve transient response in
applications where the supply voltage may fluctuate. An
additional 0.1 μF ceramic capacitor should be connected
in parallel to reduce high frequency supply noise.
ADR34xx
1µF
0.1µF
DEVICE AS POSSIBLE.
2
1
GND SENSE
GND FORCE
Figure 41. Application Showing Kelvin Connection
A ceramic capacitor of at least a 0.1 μF must be connected to
the output to improve stability and help filter out high fre-
quency noise. An additional 1 μF to 10 μF electrolytic or
ceramic capacitor can be added in parallel to improve transient
performance in response to sudden changes in load current;
however, the designer should keep in mind that doing so
increases the turn-on time of the device.
It is always advantageous to use Kelvin connections whenever
possible. However, in applications where the IR drop is negligi-
ble or an extra set of traces cannot be routed to the load, the
force and sense pins for both VOUT and GND can simply be tied
together, and the device can be used in the same fashion as a
normal 3-terminal reference (as shown in Figure 40).
Best performance and stability is attained with low ESR (for
example, less than 1 Ω), low inductance ceramic chip-type
output capacitors (X5R, X7R, or similar). If using an electrolytic
capacitor on the output, a 0.1 ꢀF ceramic capacitor should be
placed in parallel to reduce overall ESR on the output.
VIN SLEW RATE CONSIDERATIONS
In applications with slow-rising input voltage signals, the refer-
ence exhibits overshoot or other transient anomalies that appear
on the output. These phenomena also appear during shutdown
as the internal circuitry loses power.
4-WIRE KELVIN CONNECTIONS
To avoid such conditions, ensure that the input voltage wave-
form has both a rising and falling slew rate of at least 0.1 V/ms.
Current flowing through a PCB trace produces an IR voltage
drop, and with longer traces, this drop can reach several
millivolts or more, introducing a considerable error into the
output voltage of the reference. A 1 inch long, 5 millimeter wide
trace of 1 ounce copper has a resistance of approximately
100 mΩ at room temperature; at a load current of 10 mA, this
can introduce a full millivolt of error. In an ideal board layout,
the reference should be mounted as close to the load as possible
to minimize the length of the output traces, and, therefore, the
error introduced by voltage drop. However, in applications
where this is not possible or convenient, force and sense
connections (sometimes referred to as Kelvin sensing
connections) are provided as a means of minimizing the IR
drop and improving accuracy.
SHUTDOWN/ENABLE FEATURE
The ADR34xx references can be switched to a low power shut-
down mode when a voltage of 0.7 V or lower is input to the
ENABLE pin. Likewise, the reference becomes operational for
ENABLE voltages of 0.85 × VIN or higher. During shutdown, the
supply current drops to less than 5 μA, useful in applications that
are sensitive to power consumption.
If using the shutdown feature, ensure that the ENABLE pin
voltage does not fall between 0.7 V and 0.85 × VIN because this
causes a large increase in the supply current of the device and
may keep the reference from starting up correctly (see Figure 34).
If not using the shutdown feature, however, the ENABLE pin
can simply be tied to the VIN pin, and the reference remains
operational continuously.
Kelvin connections work by providing a set of high impedance
voltage-sensing lines to the output and ground nodes. Because
very little current flows through these connections, the IR drop
across their traces is negligible, and the output and ground
Rev. B | Page 20 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
SAMPLE APPLICATIONS
Negative Reference
4
6
V
+5V
V
V
FORCE
SENSE
IN
IN
OUT
R1
10kꢀ
3
5
ENABLE
V
OUT
1µF
0.1µF
Figure 42 shows how to connect the ADR3450 and a standard
CMOS op amp, such as the AD8663, to provide a negative
reference voltage. This configuration provides two main
advantages: first, it only requires two devices and, therefore,
does not require excessive board space; second, and more
importantly, it does not require any external resistors, meaning
that the performance of this circuit does not rely on choosing
expensive parts with low temperature coefficients to ensure
accuracy.
0.1µF
ADR3450
R2
10kꢀ
2
1
GND SENSE
GND FORCE
+15V
–5V
ADA4000-1
R3
5kꢀ
–15V
+VDD
Figure 43. ADR3450 Bipolar Output Reference
1µF
0.1µF
4
3
6
5
AD8663
V
V
FORCE
SENSE
IN
OUT
Boosted Output Current Reference
–5V
ENABLE
V
Figure 44 shows a configuration for obtaining higher current
drive capability from the ADR34xx references without
sacrificing accuracy. The op amp regulates the current flow
through the MOSFET until VOUT equals the output voltage of
the reference; current is then drawn directly from VIN instead of
from the reference itself, allowing increased current drive
capability.
OUT
0.1µF
ADR3450
0.1µF
–VDD
2
1
GND SENSE
GND FORCE
Figure 42. ADR3450 Negative Reference
In this configuration, the VOUT pins of the reference sit at virtual
ground, and the negative reference voltage and load current are
taken directly from the output of the operational amplifier. Note
that in applications where the negative supply voltage is close to
the reference output voltage, a dual-supply, low offset, rail-to-
rail output amplifier must be used to ensure an accurate output
voltage. The operational amplifier must also be able to source or
sink an appropriate amount of current for the application.
V
IN
+16V
U6
R1
100ꢀ
2N7002
4
3
6
V
V
FORCE
SENSE
IN
OUT
AD8663
ENABLE
V
5
OUT
V
OUT
1µF 0.1µF
0.1µF
ADR34xx
C
L
0.1µF
R
200ꢀ
L
Bipolar Output Reference
2
1
GND SENSE
GND FORCE
Figure 43 shows a bipolar reference configuration. By connecting
the output of the ADR3450 to the inverting terminal of an
operational amplifier, it is possible to obtain both positive and
negative reference voltages. R1 and R2 must be matched as
closely as possible to ensure minimal difference between the
negative and positive outputs. Resistors with low temperature
coefficients must also be used if the circuit is used in environments
with large temperature swings; otherwise, a voltage difference
develops between the two outputs as the ambient temperature
changes.
Figure 44. Boosted Output Current Reference
Because the current-sourcing capability of this circuit depends
only on the ID rating of the MOSFET, the output drive capability
can be adjusted to the application simply by choosing an
appropriate MOSFET. In all cases, the VOUT SENSE pin should
be tied directly to the load device to maintain maximum output
voltage accuracy.
Rev. B | Page 21 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
OUTLINE DIMENSIONS
3.00
2.90
2.80
6
1
5
2
4
3
3.00
2.80
2.60
1.70
1.60
1.50
PIN 1
INDICATOR
0.95 BSC
1.90
BSC
1.30
1.15
0.90
0.20 MAX
0.08 MIN
1.45 MAX
0.95 MIN
0.55
0.45
0.35
0.15 MAX
0.05 MIN
10°
4°
0°
SEATING
PLANE
0.60
BSC
0.50 MAX
0.30 MIN
COMPLIANT TO JEDEC STANDARDS MO-178-AB
Figure 45. 6-Lead Small Outline Transistor Package (SOT-23)
(RJ-6)
Dimensions shown in millimeters
ORDERING GUIDE
Ordering
Quantity Branding
Model1
Output Voltage (V)
1.200
Temperature Range
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
Package Description
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
Package Option
RJ-6
RJ-6
ADR3412ARJZ-R2
ADR3412ARJZ-R7
ADR3420ARJZ-R2
ADR3420ARJZ-R7
ADR3425ARJZ-R2
ADR3425ARJZ-R7
ADR3430ARJZ-R2
ADR3430ARJZ-R7
ADR3433ARJZ-R2
ADR3433ARJZ-R7
ADR3440ARJZ-R2
ADR3440ARJZ-R7
ADR3450ARJZ-R2
ADR3450ARJZ-R7
250
3,000
250
3,000
250
3,000
250
3,000
250
3,000
250
3,000
250
3,000
R2R
R2R
R2V
R2V
R2X
R2X
R2Z
R2Z
R31
R31
R33
R33
R34
R34
1.200
2.048
2.048
RJ-6
RJ-6
2.500
2.500
RJ-6
RJ-6
3.000
3.000
RJ-6
RJ-6
3.300
3.300
RJ-6
RJ-6
4.096
4.096
RJ-6
RJ-6
5.000
5.000
RJ-6
RJ-6
1 Z = RoHS Compliant Part.
Rev. B | Page 22 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
NOTES
Rev. B | Page 23 of 24
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
NOTES
©2010 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D08440-0-6/10(B)
Rev. B | Page 24 of 24
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