LM385AZ-1.2 [NSC]
IC 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.235 V, PBCY3, PLASTIC, TO-92, 3 PIN, Voltage Reference;
| 型号： | LM385AZ-1.2 |
| 厂家： | 
National Semiconductor |
| 描述： | IC 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.235 V, PBCY3, PLASTIC, TO-92, 3 PIN, Voltage Reference 输出元件 |
| 文件： | 总10页 (文件大小：187K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
January 1995
LM185-1.2/LM285-1.2/LM385-1.2
Micropower Voltage Reference Diode
General Description
b
55 C to
The LM185-1.2/LM285-1.2/LM385-1.2 are micropower
2-terminal band-gap voltage regulator diodes. Operating
over a 10 mA to 20 mA current range, they feature excep-
tionally low dynamic impedance and good temperature sta-
bility. On-chip trimming is used to provide tight voltage toler-
ance. Since the LM185-1.2 band-gap reference uses only
transistors and resistors, low noise and good long term sta-
bility result.
The LM185-1.2 is rated for operation over a
125 C temperature range while the LM285-1.2 is rated
§
§
40 C to 85 C and the LM385-1.2 0 C to 70 C. The LM185-
b
§
§
§
§
1.2/LM285-1.2 are available in a hermetic TO-46 package
and the LM285-1.2/LM385-1.2 are also available in a low-
cost TO-92 molded package, as well as S.O. The LM185-
1.2 is also available in a hermetic leadless chip carrier pack-
age.
Careful design of the LM185-1.2 has made the device ex-
ceptionally tolerant of capacitive loading, making it easy to
use in almost any reference application. The wide dynamic
operating range allows its use with widely varying supplies
with excellent regulation.
Features
Y
g
g
4 mV ( 0.3%) max. initial tolerance (A grade)
Y
Y
Y
Y
Y
Operating current of 10 mA to 20 mA
0.6X max dynamic impedance (A grade)
Low temperature coefficient
The extremely low power drain of the LM185-1.2 makes it
useful for micropower circuitry. This voltage reference can
be used to make portable meters, regulators or general pur-
pose analog circuitry with battery life approaching shelf life.
Low voltage referenceÐ1.235V
2.5V device and adjustable device also available
Ð LM185-2.5 series and LM185 series, respectively
Further, the wide operating current allows it to replace older
references with a tighter tolerance part.
Connection Diagrams
TO-92
Plastic Package (Z)
TO-46
Metal Can Package (H)
SO Package
TL/H/5518–10
TL/H/5518–6
Bottom View
TL/H/5518–9
Bottom View
Order Number LM285M-1.2,
Order Number LM285Z-1.2,
LM285AZ-1.2, LM285AXZ-1.2,
LM285AYZ-1.2, LM285BXZ-1.2,
LM285BYZ-1.2, LM385Z-1.2,
LM385AZ-1.2, LM385AXZ-1.2,
LM385AYZ-1.2, LM385BZ-1.2,
LM385BXZ-1.2 or LM385BYZ-1.2
See NS Package Number Z03A
LM285AM-1.2, LM285AXM-1.2,
LM285AYM-1.2, LM285BXM-1.2,
LM285BYM-1.2, LM385M-1.2,
LM385AM-1.2, LM385AXM-1.2,
LM385AYM-1.2, LM385BM-1.2,
LM385BXM-1.2 or LM385BYM-1.2
See NS Package Number M08A
Order Number LM185H-1.2,
LM185H-1.2/883, LM185BXH-1.2,
LM185BYH-1.2/883, LM285H-1.2,
LM285BXH-1.2 or LM285BYH-1.2
See NS Package Number H02A
Typical Application
Wide Input
Range Reference
SO Package
Alternate Pinout
Order Number LM385SM-1.2,
LM385ASM-1.2 or LM385BSM-1.2
See NS Package Number M08A
TL/H/5518–11
TL/H/5518–8
C
1995 National Semiconductor Corporation
TL/H/5518
RRD-B30M115/Printed in U. S. A.
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
(Note 2)
b
a
55 C to 150 C
Storage Temperature
§
§
Soldering Information
TO-92 package: 10 sec.
TO-46 package: 10 sec.
SO package: Vapor phase (60 sec.)
Infrared (15 sec.)
260 C
§
300 C
§
Reverse Current
Forward Current
Operating Temperature Range (Note 3)
LM185-1.2
30 mA
10 mA
215 C
§
220 C
§
See AN-450 ‘‘Surface Mounting Methods and Their Effect
on Product Reliability’’ for other methods of soldering sur-
face mount devices.
b
a
55 C to 125 C
§
40 C to 85 C
§
b
a
LM285-1.2
§
§
LM385-1.2
0 C to 70 C
§
§
Electrical Characteristics (Note 4)
LM285A-1.2
LM385A-1.2
LM385AX-1.2
LM385AY-1.2
LM285AX-1.2
LM285AY-1.2
Units
Parameter
Conditions
(Limit)
Tested
Limit
Design
Limit
Tested
Limit
Design
Limit
Typ
Typ
(Notes 5, 8) (Note 6)
(Note 5) (Note 6)
e
Reverse Breakdown
Voltage
I
R
100 mA
1.235
1.231
1.239
1.235
1.231
V(Min)
V(Max)
V(Min)
V(Max)
1.239
1.230
1.220 1.235
1.245
1.225
1.245
Minimum Operating
Current
mA
7
8
1
10
7
8
1
10
(Max)
s
s
1 mA
Reverse Breakdown
Voltage Change with
Current
I
MIN
I
1.5
1.5
mV
R
(Max)
s
s
20 mA
1 mA
I
10
20
10
20
mV
R
(Max)
e
e
e
20 Hz
Reverse Dynamic
Impedance
I
100 mA, f
100 mA,
0.2
0.6
0.2
0.6
X
R
R
1.5
1.5
(Max)
Wideband Noise (rms)
I
60
20
60
20
mV
s
s
10 kHz
10 Hz
f
e
e
e
1000 Hr,
Long Term Stability
I
R
100 mA, T
ppm
g
25 C 0.1 C
T
§
§
A
s
s
20 mA
Average Temperature
Coefficient (Note 7)
I
I
MIN
R
X Suffix
Y Suffix
30
50
30
50
ppm/ C
§
(Max)
All Others
150
150
2
Electrical Characteristics (Continued) (Note 4)
LM185-1.2
LM185BX-1.2
LM185BY-1.2
LM285-1.2
LM385B-1.2
LM385BX-1.2
LM385BY-1.2
LM385-1.2
Units
(Limit)
Parameter
Conditions
Typ
LM285BX-1.2
LM285BY-1.2
Tested Design Tested Design Tested Design
Limit Limit Limit Limit Limit Limit
(Notes 5, 8) (Note 6) (Note 5) (Note 6) (Note 5) (Note 6)
e
10 mA
Reverse Breakdown
Voltage
T
A
25 C,
§
1.223
1.247
1.223
1.247
1.205
1.260
V(Min)
V(Max)
1.235
8
s
s
s
I
20 mA
1 mA
R
Minimum Operating
Current
10
20
1.5
20
15
20
1.5
25
15
20
1.5
25
mA
(Max)
s
Reverse Breakdown
Voltage Change with
Current
10 mA
I
1
1
1
mV
(Max)
R
s
s
20 mA
1 mA
I
10
20
20
mV
(Max)
R
e
e
e
20 Hz
Reverse Dynamic
Impedance
I
100 mA, f
100 mA,
R
1
X
Wideband Noise (rms)
I
R
60
20
mV
s
s
10 Hz
f
10 kHz
e
e
e
1000 Hr,
Long Term Stability
I
R
100 mA, T
ppm
g
25 C 0.1 C
T
§
§
A
e
X Suffix
Average Temperature
Coefficient (Note 7)
I
R
100 mA
30
50
30
50
ppm/ C
§
Y Suffix
All Others
ppm/ C
§
150
150
150 ppm/ C
§
(Max)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
The guaranteed specifications apply only for the test conditions listed.
Note 2: Refer to RETS185H-1.2 for military specifications.
Note 3: For elevated temperature operation, T max is:
j
LM185
LM285
LM385
150 C
§
125 C
§
100 C
§
Thermal Resistance
TO-92
TO-46
SO-8
i
i
(junction to ambient)
JA
180 C/W (0.4 leads)
×
§
440 C/W
§
165 C/W
§
§
170 C/W (0.125 leads)
×
(junction to case)
JC
N/A
80 C/W
§
N/A
e
e
25 C.
Note 4: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at T
Note 5: Guaranteed and 100% production tested.
T
J
§
A
Note 6: Guaranteed, but not 100% production tested. These limits are not used to calculate average outgoing quality levels.
Note 7: The average temperature coefficient is defined as the maximum deviation of reference voltage at all measured temperatures between the operating T
MAX
b
b b
T . The measured temperatures are 55 C, 40 C, 0 C, 25 C, 70 C, 85 C, 125 C.
§ § § § § § §
MIN
and T
, divided by T
MIN
MAX
Note 8: A military RETS electrical specification is available on request.
3
Typical Performance Characteristics
Reverse Characteristics
Reverse Characteristics
Forward Characteristics
Temperature Drift of 3
Representative Units
Reverse Dynamic Impedance
Reverse Dynamic Impedance
Noise Voltage
Filtered Output Noise
Response Time
TL/H/5518–3
4
Typical Applications (Continued)
Micropower Reference
from 9V Battery
Reference from
1.5V Battery
TL/H/5518–2
Micropower* 5V Regulator
Micropower* 10V Reference
1.23V
TL/H/5518–4
e
*I
OUT
R2
5
Typical Applications (Continued)
METER THERMOMETERS
Lower Power Thermometer
b
0 C 100 C Thermometer
§
§
Calib
1. Sh
2. Re
²
I
Q
a
I
a
Q
Calibration
1. Short LM385-1.2, adjust R3 for I
TL/H/5518–5
e
temp at 1.8 mA/ K
§
OUT
2. Remove short, adjust R2 for correct reading in
F
§
Adjustment Procedure
1. Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature
multiplied by the thermocouple Seebeck coefficient.
2. Adjust zero ADJ pot until voltage across R2 equals the thermocouple
Seebeck coefficient multiplied by 273.2.
Thermocouple
Type
Seebeck
R1
R2
Voltage
Voltage
Coefficient (X)
(X)
Across R1 Across R2
@
(mV/ C)
25 C
(mV)
§
§
(mV)
15.60
12.77
12.17
1.908
J
T
K
S
52.3
42.8
40.8
6.4
523 1.24k
432 1k
14.32
11.78
11.17
1.766
412 953X
63.4 150X
Typical supply current 50 mA
6
Typical Applications (Continued)
Centigrade Thermometer
Calibration
e
1. Adjust R1 so that V1
2. Adjust V2 to 273.2 mV
temp at 1 mV/ K
§
²
I
for 1.3V to 1.6V battery volt-
e
Q
age
50 mA to 150 mA
TL/H/5518–1
Schematic Diagram
TL/H/5518–7
Connection Diagrams (Continued)
TL/H/5518–12
Order Number LM185E-1.2/883
See NS Package Number E20A
7
Physical Dimensions inches (millimeters)
Order Number LM185E-1.2/883
NS Package Number E20A
8
Physical Dimensions inches (millimeters) (Continued)
TO-46 Metal Can Package (H)
Order Number LM185H-1.2, LM185H-1.2/883, LM185BXH-1.2, LM285H-1.2, LM285BXH-1.2 or LM285BYH-1.2
NS Package Number H02A
Small Outline (SO-8) Package
Order Number LM285M-1.2, LM285AM-1.2, LM285AXM-1.2, LM285AYM-1.2, LM285BXM-1.2,
LM285BYM-1.2, LM385M-1.2, LM385AM-1.2, LM385AXM-1.2, LM385AYM-1.2, LM385BM-1.2,
LM385BXM-1.2, LM385BYM-1.2, LM385SM-1.2, LM385ASM-1.2 or LM385BSM-1.2
NS Package Number M08A
9
Physical Dimensions inches (millimeters) (Continued)
TO-92 Plastic Package (Z)
Order Number LM285Z-1.2, LM285AZ-1.2, LM285AXZ-1.2, LM285AYZ-1.2,
LM285BXZ-1.2, LM285BYZ-1.2, LM385Z-1.2, LM385AZ-1.2, LM385AXZ-1.2,
LM385AYZ-1.2, LM385BZ-1.2, LM385BXZ-1.2 or LM385BYZ-1.2
NS Package Number Z03A
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