ADR392ART-REEL7 [ROCHESTER]
1-OUTPUT THREE TERM VOLTAGE REFERENCE, 4.096 V, PDSO5, MO-178AA, SOT-23, 5 PIN;
| 型号： | ADR392ART-REEL7 |
| 厂家： | 
Rochester Electronics |
| 描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 4.096 V, PDSO5, MO-178AA, SOT-23, 5 PIN 光电二极管 输出元件 |
| 文件： | 总18页 (文件大小：1100K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Precision Low Drift 2.048 V/2.5 V/4.096 V/
5.0 V SOT-23 Reference with Shutdown
a
ADR390/ADR391/ADR392/ADR395
P IN CO NFIGURATIO N
5-Lead SO T-23
FEATURES
Initial Accuracy: ؎6 mV Max
Low TCVO: 25 ppm/؇C Max
Load Regulation: 60 ppm/mA
Line Regulation: 25 ppm/V
Low Supply Headroom: 0.3 V
Wide Operating Range: (VOUT + 0.3 V) to 15 V
Low Power: 120 A Max
(RT Suffix)
1
2
3
5
4
GND
SHDN
ADR390/
ADR391/
ADR392/
V
IN
ADR395
V
OUT (SENSE)
V
(Not to Scale)
OUT (FORCE)
Shutdown to Less Than 3 A Max
Output Current: 5 mA
Wide Temperature Range:
–40؇C to +85؇C for ADR390, ADR391
–40؇C to +125؇C for ADR392, ADR395
Tiny 5-Lead SOT-23 Package
Table I. AD R39x P roducts
Nom inal O utput Voltage (V)
P ar t Num ber
ADR390
ADR391
ADR392
ADR395
2.048
2.500
4.096
5.000
APPLICATIONS
Battery-Powered Instrumentation
Portable Medical Instruments
Data Acquisition Systems
Industrial Process Control Systems
Fault Protection Critical Systems
Automotive
GENERAL D ESCRIP TIO N
T he ADR390, ADR391, ADR392, and ADR395 are precision
2.048 V, 2.5 V, 4.096 V, and 5 V band gap voltage references
featuring high accuracy and stability and low power consump-
tion in a tiny footprint. Patented temperature drift curvature
correction techniques minimize nonlinearity of the voltage change
with temperature. T he wide operating range and low power
consumption with additional shutdown capability make them
ideal for battery-powered applications. T he VOUT Sense Pin
enables greater accuracy by supporting full Kelvin operation in
PCBs employing thin or long traces.
The ADR390, ADR391, ADR392, and ADR395 are micropower,
low dropout voltage (LDV) devices that provide a stable output
voltage from supplies as low as 300 mV above the output voltage.
ADR390 and ADR391 are specified over the industrial range
(–40∞C to +85∞C), while ADR392 and ADR395 are specified
over the extended industrial range (–40∞C to +125∞C). Each is
available in the tiny 5-lead SOT -23 package.
T he combination of VOUT sense and shutdown functions also
enables a number of unique applications combining precision
reference/regulation with fault decision and overcurrent protec-
tion. Details are provided in the Applications section.
REV. C
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
© Analog Devices, Inc., 2002
ADR390/ADR391/ADR392/ADR395
ADR390 SPECIFICATIONS
(@ V = 5.0 V to 15 V, T = 25؇C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS
S
A
P ar am eter
Sym bol
Conditions
Min
Typ
Max
Unit
Initial Accuracy
Initial Accuracy Error
T emperature Coefficient
VO
VOERR
T CVO
2.042
0.29
2.048
2.054
0.29
25
V
%
–40∞C < T A < +85∞C
5
ppm/∞C
mV
Minimum Supply Voltage Headroom VIN – VO
300
Line Regulation
Load Regulation
Quiescent Current
⌬VO/⌬VIN
VIN = 2.5 V to 15 V
–40∞C < T A < +85∞C
10
100
25
ppm/V
⌬VO/⌬ILOAD VIN = 3 V, ILOAD = 0 mA to 5 mA
–40∞C < T A < +85∞C
ISY
60
120
140
ppm/mA
A
A
V p-p
No Load
–40∞C < T A < +85∞C
0.1 Hz to 10 Hz
Voltage Noise
eN
5
T urn-On Settling T ime
Long-T erm Stability*
Output Voltage Hysteresis
Ripple Rejection Ratio
Short Circuit to GND
tR
20
50
40
85
25
30
s
⌬VO
VO_HYS
RRR
ISC
ppm/1000 hrs
ppm
dB
mA
mA
A
nA
V
fIN = 60 Hz
VIN = 5.0 V
VIN = 15.0 V
Shutdown Supply Current
Shutdown Logic Input Current
Shutdown Logic Low
ISHDN
ILOGIC
VINL
3
500
0.8
Shutdown Logic High
VINH
2.4
V
*T he long-term stability specification is noncumulative. T he drift in subsequent 1000 hour periods is significantly lower than in the first 1000 hour period.
Specifications subject to change without notice.
ADR391 SPECIFICATIONS
ELECTRICAL CHARACTERISTICS (@ V = 5.0 V to 15 V, T = 25؇C, unless otherwise noted.)
S
A
P ar am eter
Sym bol
Conditions
Min
Typ
Max
Unit
Initial Accuracy
Initial Accuracy Error
T emperature Coefficient
VO
VOERR
T CVO
2.494
0.24
2.5
2.506
0.24
25
V
%
–40∞C < T A < +85∞C
5
ppm/∞C
mV
Minimum Supply Voltage Headroom VIN – VO
300
Line Regulation
Load Regulation
⌬VO/⌬VIN
VIN = 2.8 V to 15 V
–40∞C < T A < +85∞C
VSY = 3.5 V,
10
25
ppm/V
⌬VO/⌬ILOAD
ILOAD = 0 mA to 5 mA
–40∞C < T A < +85∞C
No Load
–40∞C < T A < +85∞C
0.1 Hz to 10 Hz
60
120
140
ppm/mA
A
A
V p-p
Quiescent Current
ISY
100
Voltage Noise
eN
5
T urn-On Settling T ime
Long-T erm Stability*
Output Voltage Hysteresis
Ripple Rejection Ratio
Short Circuit to GND
tR
20
50
75
85
25
30
s
⌬VO
VO_HYS
RRR
ISC
ppm/1000 hrs
ppm
dB
mA
mA
A
nA
V
fIN = 60 Hz
VIN = 5.0 V
VIN = 15.0 V
Shutdown Supply Current
Shutdown Logic Input Current
Shutdown Logic Low
3
500
0.8
ILOGIC
VINL
Shutdown Logic High
VINH
2.4
V
*T he long-term stability specification is noncumulative. T he drift in subsequent 1000 hour periods is significantly lower than in the first 1000 hour period.
Specifications subject to change without notice.
–2–
REV. C
ADR390/ADR391/ADR392/ADR395
ADR392 SPECIFICATIONS
(@ V = 5.0 V to 15 V, T = 25؇C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS
S
A
P ar am eter
Sym bol
Conditions
Min
Typ
Max
Unit
Initial Accuracy
VO
4.090 4.096 4.912
V
Initial Accuracy Error
T emperature Coefficient
Minimum Supply Voltage Headroom VS – VO
VOERR
T CVO
0.15
300
0.15
25
%
–40∞C < T A < +125∞C
5
ppm/∞C
mV
Line Regulation
Load Regulation
⌬VO/⌬VIN
VIN = 4.4 V to 15 V
–40∞C < T A < +125∞C
VSY = 5 V,
10
25
ppm/V
⌬VO/⌬ILOAD
ILOAD = 0 mA to 5 mA
–40∞C < T A < +125∞C
No Load
–40∞C < T A < +125∞C
0.1 Hz to 10 Hz
140
120
140
ppm/mA
A
A
V p-p
Quiescent Current
ISY
100
Voltage Noise
eN
5
T urn-On Settling T ime
Long-T erm Stability*
Output Voltage Hysteresis
Ripple Rejection
tR
20
50
75
85
25
30
s
⌬VO
VO_HYS
RRR
ISC
ppm/1000 hrs
ppm
dB
mA
mA
A
nA
V
fIN = 60 Hz
VIN = 5.0 V
VIN = 15.0 V
Short Circuit to GND
Shutdown Supply Current
Shutdown Logic Input Current
Shutdown Logic Low
3
500
0.8
ILOGIC
VINL
Shutdown Logic High
VINH
2.4
V
*T he long-term stability specification is noncumulative. T he drift in subsequent 1000 hour periods is significantly lower than in the first 1000 hour period.
Specifications subject to change without notice.
ADR395 SPECIFICATIONS
(@ V = 6.0 V to 15 V, T = 25؇C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS
S
A
P ar am eter
Sym bol
Conditions
Min
Typ
Max
Unit
Initial Accuracy
Initial Accuracy Error
T emperature Coefficient
VO
VOERR
T CVO
4.994
0.12
5.000
5.006
0.12
25
V
%
–40∞C < T A < +125∞C
5
ppm/∞C
mV
Minimum Supply Voltage Headroom VS – VO
300
Line Regulation
Load Regulation
⌬VO/⌬VIN
VIN = 5.3 V to 15 V
–40∞C < T A < +125∞C
VSY = 6 V,
10
30
ppm/V
⌬VO/⌬ILOAD
ILOAD = 0 mA to 5 mA
–40∞C < T A < +125∞C
No Load
–40∞C < T A < +125∞C
0.1 Hz to 10 Hz
140
120
140
ppm/mA
A
A
V p-p
Quiescent Current
ISY
100
Voltage Noise
eN
5
T urn-On Settling T ime
Long-T erm Stability*
Output Voltage Hysteresis
Ripple Rejection
tR
20
50
75
85
25
30
s
⌬VO
VO_HYS
RRR
ISC
ppm/1000 hrs
ppm
dB
mA
mA
A
nA
V
fIN = 60 Hz
VIN = 5.0 V
VIN = 15.0 V
Short Circuit to GND
Shutdown Supply Current
Shutdown Logic Input Current
Shutdown Logic Low
3
500
0.8
ILOGIC
VINL
Shutdown Logic High
VINH
2.4
V
*T he long-term stability specification is noncumulative. T he drift in subsequent 1000 hour periods is significantly lower than in the first 1000 hour period.
Specifications subject to change without notice.
–3–
REV. C
ADR390/ADR391/ADR392/ADR395
ABSO LUTE MAXIMUM RATINGS 1, 2
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V
Output Short-Circuit Duration
P ackage Type
Unit
JA
JC
5-Lead SOT -23 (RT )
230
∞C/W
to GND . . . . . . . . . . . . . . . . . . . . . Observe Derating Curves
Storage T emperature Range
RT Package . . . . . . . . . . . . . . . . . . . . . . . –65∞C to +150∞C
Operating T emperature Range
ADR390/ADR391 . . . . . . . . . . . . . . . . . . . –40∞C to +85∞C
ADR392/ADR395 . . . . . . . . . . . . . . . . . . –40∞C to +125∞C
Junction T emperature Range
NOT ES
1 Absolute Maximum Ratings apply at 25∞C, unless otherwise noted.
2 Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. T his is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
RT Package . . . . . . . . . . . . . . . . . . . . . . . –65∞C to +150∞C
Lead T emperature Range (Soldering, 60 Sec) . . . . . . . . 300∞C
O RD ERING GUID E
Tem per atur e
Range
P ackage
D escr iption
P ackage
O ption
Top
Mar k
O utput
Voltage
Num ber of
P ar ts P er Reel
Model
ADR390ART –RL7
ADR390ART –RL
ADR391ART -RL7
ADR391ART -RL
ADR392ART -RL7
ADR392ART -RL
ADR395ART -RL7
–40∞C to +85∞C
–40∞C to +85∞C
–40∞C to +85∞C
–40∞C to +85∞C
–40∞C to +125∞C
–40∞C to +125∞C
–40∞C to +125∞C
5-Lead SOT -23
5-Lead SOT -23
5-Lead SOT -23
5-Lead SOT -23
5-Lead SOT -23
5-Lead SOT -23
5-Lead SOT -23
RT -5
RT -5
RT -5
RT -5
RT -5
RT -5
RT -5
R0A
R0A
R1A
R1A
RCA
RCA
RDA
2.048
2.048
2.500
2.500
4.096
4.096
5.000
3,000
10,000
3,000
10,000
3,000
10,000
3,000
CAUTIO N
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the ADR390/ADR391/ADR392/ADR395 features proprietary ESD protection circuitry, perma-
nent damage may occur on devices subjected to high energy electrostatic discharges. T herefore,
proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
–4–
REV. C
ADR390/ADR391/ADR392/ADR395
P ARAMETER D EFINITIO N
Tem per atur e Coefficient (TCVO )
T he change of output voltage over the operating temperature
change and normalized by the output voltage at 25∞C, expressed
in ppm/∞C. T he equation follows:
response can be improved with an additional 1 mF to 10 mF
output capacitor in parallel. A capacitor here will act as a source
of stored energy for a sudden increase in load current. T he only
parameter that will degrade, by adding an output capacitor, is
turn-on time and it depends on the size of the capacitor chosen.
Long-Ter m Stability
VO T2 -VO T1
(
)
(
)
TCVO ppm ∞C =
¥106
T ypical shift in output voltage over 1000 hours at a controlled
temperature. Figure 1 shows a sample of parts measured at differ-
ent intervals in a controlled environment of 50∞C for 1000 hours.
]
[
VO 25∞C ¥ T2 -T1
(
)
(
)
where:
VO(25∞C) = VO at 25∞C
DVO =VO
t
-V t
( ) O ( 1 )
0
VO(T1) = VO at temperature1
VO(T2) = VO at temperature2
VO
t
-V t
( ) O ( 1 )
0
DVO ppm =
¥106
[
]
VO
t
( )
0
Line Regulation (⌬VO /⌬VIN
)
T he change in output voltage due to a specified change in input
voltage. It includes the effects of self-heating. Line regulation is
expressed in either percent per volt, parts per million per volt, or
microvolts per volt change in input voltage.
where:
VO(t0) = VO at time 0
VO(t1) = VO after 1000 hours operation at a controlled
temperature
Load Regulation (⌬VO /⌬ILO AD
)
T he change in output voltage due to a specified change in load
current. It includes the effects of self-heating. Load regulation is
expressed in either microvolts per milliampere, parts per million
per milliampere, or W of dc output resistance.
Ther m al H yster esis (VO _H YS
)
T he change of output voltage after the device is cycled through
temperature from +25∞C to –40∞C to +85∞C and back to
+25∞C. T his is a typical value from a sample of parts put
through such a cycle.
Input Capacitor
Input capacitors are not required on the ADR39x. T here is no
limit for the value of the capacitor used on the input, but a 1 mF
to 10 mF capacitor on the input will improve transient response
in applications where the supply suddenly changes. An additional
0.1 mF in parallel will also help in reducing noise from the supply.
VO
=VO 25∞C -V
(
)
_ HYS
O
_TC
VO 25∞C -V
(
)
O
_TC
VO
ppm =
¥ 106
[
]
_ HYS
VO 25∞C
(
)
O utput Capacitor
where:
The ADR39x does not need output capacitors for stability under
any load condition. An output capacitor, typically 0.1 mF, will
filter out any low level noise voltage and will not affect the
operation of the part. On the other hand, the load transient
VO(25∞C) = VO at 25∞C
VO_TC = VO at 25∞C after temperature cycle at +25∞C to
–40∞C to +85∞C and back to +25∞C
200
DATA TAKEN IN CONTROLLED
ENVIRONMENT @ 50؇C ؎ 1؇C
150
100
50
0
؊50
؊100
؊150
0
86
176
250
324
440
640
840
1040
TIME – Hours
Figure 1. ADR391 Typical Long-Term Drift over 1000 Hours
REV. C
–5–
–Typical Performance Characteristics
ADR390/ADR391/ADR392/ADR395
2.054
5.006
SAMPLE 1
2.052
2.050
5.004
SAMPLE 3
5.002
SAMPLE 2
5.000
2.048
2.046
2.044
2.042
SAMPLE 2
SAMPLE 1
4.998
SAMPLE 3
4.996
4.994
–40
؊40
؊15
10
35
60
85
–5
30
65
100
125
TEMPERATURE – ؇C
TEMPERATURE – ؇C
TPC 1. ADR390 Output Voltage vs. Temperature
TPC 4. ADR395 Output Voltage vs. Temperature
140
2.506
2.504
120
SAMPLE 1
+85؇C
2.502
100
+25؇C
SAMPLE 2
2.500
؊40؇C
80
2.498
SAMPLE 3
60
2.496
2.494
40
2.5
5.0
7.5
10.0
12.5
15.0
؊40
؊15
10
35
60
85
INPUT VOLTAGE – V
TEMPERATURE – ؇C
TPC 2. ADR391 Output Voltage vs. Temperature
TPC 5. ADR390 Supply Current vs. Input Voltage
4.100
140
4.098
120
SAMPLE 3
4.096
+85؇C
SAMPLE 2
100
+25؇C
4.094
SAMPLE 1
؊40؇C
80
4.092
4.090
4.088
60
40
2.5
5.0
7.5
10.0
12.5
15.0
–40
0
40
80
125
INPUT VOLTAGE – V
TEMPERATURE – ؇C
TPC 3. ADR392 Output Voltage vs. Temperature
TPC 6. ADR391 Supply Current vs. Input Voltage
–6–
REV. C
ADR390/ADR391/ADR392/ADR395
140
120
100
80
40
I = 0mA TO 5mA
L
+125؇C
35
30
25
20
15
10
V
= 3.5V
= 5.0V
IN
+25؇C
–40؇C
V
IN
60
40
؊40
؊15
10
35
60
85
5
7
9
11
13
15
TEMPERATURE – ؇C
INPUTVOLTAGE –V
TPC 7. ADR392 Supply Current vs. Input Voltage
TPC 10. ADR391 Load Regulation vs. Temperature
140
90
80
+125؇C
120
V
= 7.5V
V
IN
+25؇C
–40؇C
100
80
70
60
50
40
= 5V
IN
60
40
5.5
7.0
8.5
10.0
11.5
13.0
14.5
–40
–5
30
65
100
125
INPUTVOLTAGE –V
TEMPERATURE – ؇C
TPC 8. ADR395 Supply Current vs. Input Voltage
TPC 11. ADR392 Load Regulation vs. Temperature
80
70
40
I = 0mA TO 5mA
L
35
30
25
20
15
10
V
= 7.5V
IN
V
= 5V
IN
V
= 3.0V
= 5.0V
60
50
40
30
IN
V
IN
؊40
؊15
10
35
60
85
–40
–5
30
65
100
125
TEMPERATURE – ؇C
TEMPERATURE – ؇C
TPC 9. ADR390 Load Regulation vs. Temperature
TPC 12. ADR395 Load Regulation vs. Temperature
–7–
REV. C
ADR390/ADR391/ADR392/ADR395
14
12
10
8
5
V
= 2.5V TO 15V
IN
4
3
2
V
= 5.3VTO 15V
IN
6
4
1
0
2
0
–40
؊40
؊15
10
35
60
85
–5
30
65
100
125
TEMPERATURE – ؇C
TEMPERATURE – ؇C
TPC 13. ADR390 Line Regulation vs. Temperature
TPC 16. ADR395 Line Regulation vs. Temperature
2.848
5
V
= 2.8V TO 15V
IN
4
3
2
2.648
؊40؇C
2.448
+85؇C
+25؇C
2.248
1
0
2.048
0
1
2
3
4
5
؊40
؊15
10
35
60
85
LOAD CURRENT – mA
TEMPERATURE – ؇C
TPC 17. ADR390 Minimum Input Voltage vs.
Load Current
TPC 14. ADR391 Line Regulation vs. Temperature
14
12
10
8
3.30
3.10
+85؇C
+25؇C
2.90
V
= 4.4VTO 15V
IN
6
4
2
0
؊40؇C
2.70
2.50
0
1
2
3
4
5
–40
–5
30
65
100
125
LOAD CURRENT – mA
TEMPERATURE – ؇C
TPC 15. ADR392 Line Regulation vs. Temperature
TPC 18. ADR391 Minimum Input Voltage vs. Load Current
–8–
REV. C
ADR390/ADR391/ADR392/ADR395
4.8
4.6
4.4
4.2
4.0
3.8
70
TEMPERATURE: +25؇C
؊40؇C
+85؇C
+25؇C
60
50
40
30
20
10
0
+125؇C
+25؇C
–40؇C
؊0.56
؊0.41
؊0.26
؊0.11
0.04
0.19
0.34
0
1
2
3
4
5
V
DEVIATION – mV
LOAD CURRENT – mA
OUT
TPC 22. ADR391 VOUT Hysteresis Distribution
TPC 19. ADR392 Minimum Input Voltage vs. Load Current
6.0
5.8
1k
V
= 5V
IN
+125؇C
5.6
+25؇C
5.4
ADR391
ADR390
–40؇C
5.2
5.0
4.8
4.6
100
10
100
FREQUENCY – Hz
1k
10k
0
1
2
3
4
5
LOAD CURRENT – mA
TPC 20. ADR395 Minimum Input Voltage vs. Load Current
TPC 23. Voltage Noise Density vs. Frequency
60
0
0
0
0
0
0
0
0
TEMPERATURE: +25؇C
؊40؇C
+85؇C
+25؇C
50
40
30
20
10
0
0
؊0.24 ؊0.18 ؊0.12 ؊0.06
0
0.06 0.12 0.18 0.24 0.30
V
DEVIATION – mV
TIME – 1 Sec/DIV
OUT
TPC 21. ADR390 VOUT Hysteresis Distribution
TPC 24. ADR391 Typical Voltage Noise 0.1 Hz to 10 Hz
REV. C
–9–
ADR390/ADR391/ADR392/ADR395
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
C
= 0nF
L
V
OUT
V
ON
LOAD OFF
LOAD
0
TIME – 10ms/DIV
TIME – 200s/DIV
TPC 28. ADR391 Load Transient Response
TPC 25. ADR391 Voltage Noise 10 Hz to 10 kHz
0
0
0
0
0
0
0
0
0
0
C
= 1nF
C
= 0F
L
BYPASS
V
0
0
0
0
OUT
LINE
INTERRUPTION
0.5V/DIV
LOAD OFF
V
ON
LOAD
V
OUT
1V/DIV
0
0
0
TIME – 10s/DIV
TIME – 200s/DIV
TPC 29. ADR391 Load Transient Response
TPC 26. ADR391 Line Transient Response
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
C
= 100nF
C
= 0.1F
L
BYPASS
V
OUT
0.5V/DIV
LINE
INTERRUPTION
LOAD OFF
V
ON
LOAD
V
OUT
1V/DIV
TIME – 200s/DIV
TIME – 10s/DIV
TPC 27. ADR391 Line Transient Response
TPC 30. ADR391 Load Transient Response
–10–
REV. C
ADR390/ADR391/ADR392/ADR395
0
0
0
0
0
0
0
0
0
0
R
= 500⍀
V
= 15V
L
IN
0
0
0
0
0
0
0
0
5V/DIV
2V/DIV
V
OUT
V
IN
2V/DIV
V
5V/DIV
OUT
V
IN
TIME – 200s/DIV
TIME – 20s/DIV
TPC 34. ADR391 Turn-On/Turn-Off Response at 5 V
TPC 31. ADR391 Turn-On Response Time at 15 V
0
0
V
= 15V
IN
R
C
= 500⍀
= 100nF
L
L
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
V
5V/DIV
IN
2V/DIV
5V/DIV
V
OUT
V
2V/DIV
OUT
V
IN
TIME – 200s/DIV
TIME – 40s/DIV
TPC 32. ADR391 Turn-Off Response at 15 V
TPC 35. ADR391 Turn-On/Turn-Off Response at 5 V
0
0
0
0
0
0
0
0
0
80
60
40
C
= 0.1F
BYPASS
2V/DIV
5V/DIV
20
0
V
OUT
؊20
؊40
V
IN
؊60
؊80
؊100
؊120
10
100
1k
10k
100k
1M
TIME – 200s/DIV
FREQUENCY – Hz
TPC 36. Ripple Rejection vs. Frequency
TPC 33. ADR391 Turn-On/Turn-Off Response at 5 V
–11–
REV. C
ADR390/ADR391/ADR392/ADR395
Device Power Dissipation Considerations
100
The ADR390/ADR391/ADR392/ADR395 is capable of deliver-
ing load currents to 5 mA with an input voltage that ranges from
2.8 V (ADR391 only) to 15 V. When this device is used in applica-
tions with large input voltages, care should be taken to avoid
exceeding the specified maximum power dissipation or junction
temperature that could result in premature device failure. The
following formula should be used to calculate a device’s maxi-
mum junction temperature or dissipation:
90
80
70
60
C
= 0F
L
50
40
30
20
10
0
TJ −TA
PD =
C
= 0.1F
L
C
= 1F
L
θJA
In this equation, TJ and TA are, respectively, the junction and
ambient temperatures, PD is the device power dissipation, and
10
100
1k
10k
100k
1M
FREQUENCY – Hz
JA is the device package thermal resistance.
TPC 37. Output Impedance vs. Frequency
THEORY OF OPERATION
Shutdown Mode Operation
The ADR390/ADR391/ADR392/ADR395 includes a shutdown
feature that is TTL/CMOS level compatible. A logic LOW or a
zero volt condition on the SHDN Pin is required to turn the device
off. During shutdown, the output of the reference becomes a
high impedance state where its potential would then be deter-
mined by external circuitry. If the shutdown feature is not used,
the SHDN Pin should be connected to VIN (Pin 2).
Band gap references are the high performance solution for low
supply voltage and low power voltage reference applications, and
the ADR390/ADR391/ADR392/ADR395 is no exception. The
uniqueness of this product lies in its architecture. By observing
Figure 2, the ideal zero TC band gap voltage is referenced to the
output, not to ground. Therefore, if noise exists on the ground
line, it will be greatly attenuated on VOUT. The band gap cell
consists of the pnp pair Q51 and Q52, running at unequal cur-
rent densities. The difference in VBE results in a voltage with a
APPLICATIONS
BASIC VOLTAGE REFERENCE CONNECTION
The circuit in Figure 3 illustrates the basic configuration for the
ADR39x family. Decoupling capacitors are not required for circuit
stability. The ADR39x family is capable of driving capacitive
loads from 0 µF to 10 µF. However, a 0.1 µF ceramic output
capacitor is recommended to absorb and deliver the charge as is
required by a dynamic load.
R58
R54
2 ×
positive TC, which is amplified by the ratio of
. This
PTAT voltage, combined with VBEs of Q51 and Q52, produces
the stable band gap voltage.
Reduction in the band gap curvature is performed by the ratio of
the resistors R44 and R59, one of which is linearly temperature
dependent. Precision laser trimming and other patented circuit
techniques are used to further enhance the drift performance.
SHUTDOWN
GND
SHDN
ADR39x
IN
INPUT
V
*
V
IN
0.1F
C
B
V
V
OUT(F)
OUT(S)
Q1
V
OUT (FORCE)
V
OUT (SENSE)
OUTPUT
0.1F
*
R59
R44
R58
C
B
* NOT REQUIRED
Figure 3. Basic Configuration for the ADR39x Family
R49
R54
Q51
Stacking Reference ICs for Arbitrary Outputs
Some applications may require two reference voltage sources,
which are a combined sum of standard outputs. Figure 4
circuit shows how this “stacked output” reference can be
implemented:
SHDN
R53
Q52
R48
R60
R61
GND
Figure 2. Simplified Schematic
–12–
REV. C
ADR390/ADR391/ADR392/ADR395
+V
DD
OUTPUTTABLE
U1/U2
V
(V)
V
(V)
OUT1
OUT2
2
ADR390/ADR390
ADR391/ADR391
ADR392/ADR392
ADR395/ADR395
2.048
2.5
4.096
5
4.096
5.0
8.192
10
V
IN
4
3
V
OUT(F)
1
V
SHDN
OUT(S)
V
IN
2
U2
V
IN
GND
5
1
4
V
V
OUT2
SHDN
C2
OUT(F)
–V
REF
0.1F
A1
3
V
OUT(S)
GND
5
–V
DD
Figure 5. Negative Reference
General-Purpose Current Source
2
U1
V
IN
Many times in low power applications, the need arises for a preci-
sion current source that can operate on low supply voltages. As
shown in Figure 6, the ADR390/ADR391/ADR392/ADR395
can be configured as a precision current source. The circuit
configuration illustrated is a floating current source with a
grounded load. The reference’s output voltage is bootstrapped
across RSET, which sets the output current into the load. With
this configuration, circuit precision is maintained for load cur-
rents in the range from the reference’s supply current, typically
90 µA to approximately 5 mA.
1
4
3
V
V
SHDN
V
OUT1
C2
0.1F
OUT(F)
OUT(S)
GND
5
Figure 4. Stacking Voltage References with the
ADR390/ADR391/ADR392/ADR395
Two reference ICs are used, fed from an unregulated input, VIN.
The outputs of the individual ICs are simply connected in series,
which provides two output voltages VOUT1 and VOUT2. VOUT1 is
the terminal voltage of U1, while VOUT2 is the sum of this voltage
and the terminal voltage of U2. U1 and U2 are simply chosen for
the two voltages that supply the required outputs (see Output
Table). For example, if both U1 and U2 are ADR391s, VOUT1
is 2.5 V and VOUT2 is 5.0 V.
V
IN
SHDN
V
OUT
ADR39x
I
V
OUT
SET
V
IN
While this concept is simple, a precaution is in order. Since the
lower reference circuit must sink a small bias current from U2,
plus the base current from the series PNP output transistor in
U2, either the external load of U1 or R1 must provide a path for
this current. If the U1 minimum load is not well defined, the
resistor R1 should be used, set to a value that will conservatively
pass 600 µA of current with the applicable VOUT1 across it. Note
that the two U1 and U2 reference circuits are locally treated as
macrocells, each having its own bypasses at input and output for
best stability. Both U1 and U2 in this circuit can source dc
currents up to their full rating. The minimum input voltage, VIN,
is determined by the sum of the outputs, VOUT2, plus the drop-
out voltage of U2.
R1
R1
P1
0.1F
GND
R
SET
I
SY
}
ADJUST
I
(I )
SY SET
I
= I
+ I (I )
SY SET
OUT
SET
R
L
Figure 6. A General-Purpose Current Source
High Power Performance with Current Limit
In some cases, the user may want higher output current delivered
to a load and still achieve better than 0.5% accuracy out of the
ADR39x. The accuracy for a reference is normally specified on
the data sheet with no load. However, the output voltage changes
with load current.
A Negative Precision Reference without Precision Resistors
A negative reference can be easily generated by adding an op amp,
A1, and configured as shown in Figure 5. VOUTF and VOUTS are
at virtual ground and therefore the negative reference can be
taken directly from the output of the op amp. The op amp must
be dual supply, low offset, and rail-to-rail if the negative supply
voltage is close to the reference output.
The circuit in Figure 7 provides high current without compro-
mising the accuracy of the ADR39x. The series pass transistor
Q1 provides up to 1 A load current. The ADR39x delivers only
the base drive to Q1 through the force pin. The sense pin of the
ADR39x is a regulated output and is connected to the load.
The transistor Q2 protects Q1 during short circuit limit faults by
robbing its base drive. The maximum current is ILMAX ≈ 0.6 V/RS.
REV. C
–13–
ADR390/ADR391/ADR392/ADR395
R1
4.7k⍀
R1
4.7k⍀
U1
U1
V
V
IN
IN
GND
GND
SHDN
SHDN
V
V
IN
Q2N2222
IN
V
Q1
Q2N4921
V
Q1
OUT (FORCE)
OUT (FORCE)
Q2
V
V
OUT (SENSE)
OUT (SENSE)
Q2
Q2N2222
Q2N4921
R
S
R
S
ADR39x
ADR39x
I
R
R
L
L
L
Figure 8. ADR39x High Output Current with
Darlington Drive Configuration
Figure 7. ADR39x for High Power Performance
with Current Limit
A similar circuit function can also be achieved with the Darlington
transistor configuration (see Figure 8).
–14–
REV. C
ADR390/ADR391/ADR392/ADR395
O UTLINE D IMENSIO NS
5-Lead P lastic Sur face-Mount P ackage [SO T-23]
(RT-5)
D imensions shown in millimeters
2.90
5
1
4
3
2.80 BSC
1.60 BSC
2
PIN 1
0.95 BSC
1.90
BSC
1.30
1.15
0.90
1.45 MAX
10؇
0؇
0.15 MAX
0.50
0.30
0.60
0.45
0.30
SEATING
PLANE
0.22
0.08
COMPLIANT TO JEDEC STANDARDS MO-178AA
REV. C
–15–
ADR390/ADR391/ADR392/ADR395
Revision History
Location
Page
10/02—Data Sheet changed from REV. B to REV. C.
Add parts ADR392 and ADR395 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Universal
Changes to FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Changes to GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Additions to Table I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Changes to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Changes to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Changes to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
New TPCs 3, 4, 7, 8, 11, 12, 15, 16, 19, and 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
New Figures 4 and 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Deleted A Negative Precision Reference without Precision Resistors section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Edits to General-Purpose Current Source section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5/02—Data Sheet changed from REV. A to REV. B.
Change to Figure 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Edits to layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal
–16–
REV. C
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5 ld SOT-23
ADR392ART-R2
Production
5
5
5
Industrial
-
-
5 ld SOT-23
5 ld SOT-23
ADR392ART-REEL
PRODUCTION
INDUSTRIAL
ADR392ART-REEL7 PRODUCTION
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