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Электронный компонент: LM385BS8-2.5

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1
LM185-2.5/
LM285-2.5/LM385-2.5
Micropower Voltage
Reference
s
Portable Meter References
s
Portable Test Instruments
s
Battery-Operated Systems
s
Panel Meters
s
Current Loop Instrumentation
U
S
A
O
PPLICATI
s
20
A to 20mA Operating Range
s
Guaranteed 1% Initial Voltage Tolerance
s
Guaranteed 1
Dynamic Impedance
s
Very Low Power Consumption
S
FEATURE
The LM185-2.5 is a two-terminal band gap reference
diode that has been designed for applications which
require precision performance with micropower opera-
tion. The device provides guaranteed operation specifica-
tions at currents as low as 20
A. The nominal voltage is
2.5V with both 1% and 2% tolerances available. Some
additional features are: maximum dynamic impedance of
1
, low noise and excellent stability over time and tem-
perature. The advanced design, processing and testing
techniques make Linear's LM185-2.5 a superior choice
over previous designs. A circuit for cold junction compen-
sation of a thermocouple is shown below.
For applications requiring guaranteed temperature drift,
see the LT1034 data sheet.
D
U
ESCRIPTIO
U
A
O
PPLICATI
TYPICAL
REVERSE CURRENT (mA)
0
OUTPUT VOLTAGE CHANGE (mV)
4
8
12
16
0.01
1
10
100
LM185-2.5 TA02
4
0.1
55C
T
A
+125C
Reverse Voltage Change
Thermocouple Cold Junction Compensator
R
SET
2k
450
V
IN
10k ADJUST
FOR 12.17mV
AT 25C
ACROSS 450
V
16k
950
LM385-2.5
100k W.W.
ZERO
1M
2 MERCURY
CELLS 2.6V
METER
+
TYPE K
LM185-2.5 TA01
I
Q
50
A
LM334
2
LM185-2.5/
LM285-2.5/LM385-2.5
Reverse Breakdown Current ................................ 30mA
Forward Current................................................... 10mA
Operating Temperature Range
LM185-2.5 ..................................... 55
C to 125
C
LM285-2.5 ...................................... 40
C to 85
C
LM385-2.5 ........................................... 0
C to 70
C
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
Storage Temperature Range
LM185-2.5 .................................... 65
C to 150
C
LM285-2.5 .................................... 65
C to 150
C
LM385-2.5 .................................... 65
C to 150
C
Lead Temperature (Soldering, 10 sec.) ................ 300
C
ELECTRICAL C
C
HARA TERISTICS
(See Note 1)
The
q
denotes specifications which apply over the operating temperature
range.
Note 1: All specifications are for T
A
= 25
C unless otherwise noted. For
the LM185-2.5 T
MIN
= 55
C and T
MAX
= 125
C. For LM285-2.5, T
MIN
=
40
C and T
MAX
= 85
C. For LM385-2.5, T
MIN
= 0
C and T
MAX
= 70
C.
Note 2: For very low initial tolerance, consult LT1004 data sheet. The
LT1004 is a low cost, pin for pin substitution device. For guaranteed
temperature coefficient consult the LT1034-2.5 data sheet.
Note 3: Guaranteed but not tested.
W
U
U
PACKAGE/ORDER I FOR ATIO
LM185H-2.5
LM285H-2.5
LM385H-2.5
LM385BH-2.5
(NOTE 2)
LM285Z-2.5
LM385Z-2.5
LM385BZ-2.5
(NOTE 2)
PART MARKING
2852
3852
3852B
LM285S8-2.5
LM385S8-2.5
LM385BS8-2.5
ORDER PART
NUMBER
ORDER PART
NUMBER
ORDER PART
NUMBER
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
Z
Reverse Breakdown Voltage
T
A
= 25
C, 20
A
I
R
20mA
LM185-2.5/285-2.5
2.462
2.500
2.538
V
LM385-2.5
2.425
2.500 2.575
V
LM385B-2.5 (Note 2)
2.462
2.500 2.538
V
V
Z
Average Temperature Coefficient
20
A
I
R
20mA (Note 2)
20
20
ppm/
C
Temp
I
MIN
Minimum Operating Current
T
MIN
T
A
T
MAX
q
8
20
8
20
A
V
Z
Reverse Breakdown Voltage
20
A
I
R
1mA
I
R
Change With Current
T
A
= 25
C
1.0
2.0
mV
T
MIN
T
A
T
MAX
q
1.5
2.5
mV
1mA
I
R
20mA
T
A
= 25
C
10
20
mV
T
MIN
T
A
T
MAX
q
20
25
mV
r
Z
Reverse Dynamic Impedance
I
R
= 100
A (Note 3)
T
A
= 25
C
0.2
0.6
0.4
1.0
T
MIN
T
A
T
MAX
q
1.5
1.5
e
n
Wide Band Noise (RMS)
10Hz
f
10kHz, I
R
= 100
A
120
120
V
V
Z
Long Term Stability
T
A
= 25
C
0.1
C, I
R
= 100
A
20
20
ppm/kHr
Time
LM385-2.5/385B-2.5
LM185-2.5/285-2.5
1
2
3
BOTTOM VIEW
Z PACKAGE
3-LEAD TO-92 PLASTIC
LM185-2.5 PO02
2
1
BOTTOM VIEW
H PACKAGE
2-LEAD TO-46 METAL CAN
LM185-2.5 PO01
1
2
3
4
5
6
7
8
TOP VIEW
NC
NC
NC
(DO NOT
USE)
NC
S8 PACKAGE
8-LEAD PLASTIC SO
NC
LM185-2.5 PO03
3
LM185-2.5/
LM285-2.5/LM385-2.5
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
Reverse Characteristics
Forward Characteristics
Temperature Drift
FORWARD CURRENT (mA)
0.4
FORWARD VOLTAGE (V)
0.8
1.2
1.6
0.01
1
10
100
LM185-2.5 TPC02
0
0.1
T
A
= 25C
TEMPERATURE (C)
55
2.480
REFERENCE VOLTAGE (V)
2.485
2.495
2.500
2.505
2.515
15
25
45
125
LM185-2.5 TPC03
2.490
2.520
2.525
2.510
35
5
65
85 105
Reverse Dynamic Impedance
Reverse Dynamic Impedance
Noise Voltage
FREQUENCY (Hz)
10
DYNAMIC IMPEDANCE (
)
100
1k
10k
100k
LM185-2.5 TPC05
10
1
0.1
100
1k
10k
1M
T
A
= 25C
I
R
= 100
A
FREQUENCY (Hz)
600
800
1000
1200
1400
10
1k
10k
100k
LM185-2.5M TPC06
0
100
400
200
NOISE (nV/
Hz)
Filtered Output Noise
Response Time
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of circuits as described herein will not infringe on existing patent rights.
CUTOFF FREQUENCY (Hz)
100
0
INTEGRATED NOISE (
V
RMS
)
80
100
120
100k
1k
10k
LM185-2.5 TPC07
60
40
20
100mA
R
C
RC LOW PASS
TIME (
S)
2.0
3.0
LM185-2.5 TPC08
1.0
0
0
500
5V
0
4.0
VOLTAGE (V)
100
V
OUT
V
IN
24k
OUTPUT
INPUT
REVERSE CURRENT (mA)
1
DYNAMIC IMPEDANCE (
)
10
100
1000
0.01
1
10
100
LM185-2.5 TPC05
0.1
0.1
f = 25Hz
55C TO 125C
REVERSE VOLTAGE (V)
0
0.1
REVERSE CURRENT (
A)
1
10
100
0.5
1.0
1.5
2.0
LM185-2.5 TPC01
2.5
3.0
55C TO 125C
4
LM185-2.5/
LM285-2.5/LM385-2.5
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900
q
FAX
: (408) 434-0507
q
TELEX
: 499-3977
LINEAR TECHNOLOGY CORPORATION 1992
LT/GP 0892 1K REV B
S
W
A
W
CHE
TI
I
C D AGRA
220k
9V
2.5V
LM385-2.5
REFERENCE FROM
A 9V BATTERY
2.7k
V
+
2.5V
LM385-2.5
OPERATION OVER A
WIDE SUPPLY RANGE
R
3.7V
V
+
30V
LM185-2.5 TA03
LM334
100k
Q2
20pF
7.5k
Q4
Q5
500
60k
Q6
20pF
Q8
600k
Q9
Q11
Q13
200k
50k
300k
Q14
500k
500k
+
Q1
Q10
LM185-2.5 SD01
Q3
Q7
Q12
U
S
A
O
PPLICATI
TYPICAL
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
H Package, 2-Lead TO-46 Metal Can
Z package, 3-Lead TO-92 Plastic
0.050 0.005
(1.270 0.127)
0.060 0.005
(1.524 0.127)
DIA
0.90
(2.286)
NOM
0.180 0.005
(4.572 0.127)
0.180 0.005
(4.572 0.127)
0.500
(12.79)
MIN
0.050
(1.270)
MAX
UNCONTROLLED
LEAD DIA
0.020 0.003
(0.508 0.076)
0.016 0.03
(0.406 0.076)
5
NOM
0.015 0.02
(0.381 0.051)
0.060 0.010
(1.524 0.254)
10 NOM
0.140 0.010
(3.556 0.127)
Z3 1191
T
JMAX
JA
JC
150
C 440
C/W 80
CW
0.016 0.019
(0.406 0.483)
DIA
0.025
(0.635)
MAX
0.080 0.100
(2.032 2.540)
0.500
(12.700)
MIN
0.178 0.195
(4.521 4.953)
0.209 0.219
(5.309 5.537)
0.100
(2.540)
TYP
45
H3(46) 0592
0.050
(1.270)
TYP
0.050
(1.270)
TYP
0.028 0.048
(0.711 1.219)
0.036 0.046
(0.914 1.168)
0.015
(0.381)
MAX
FOR 3-LEAD PACKAGE ONLY
T
JMAX
JA
100
C 160
C/W
T
JMAX
JA
150
C 220
C/W
S8 package, 8-Lead Plastic SOIC
1
2
3
4
0.150 0.157
(3.810 3.988)
8
7
6
5
0.189 0.197
(4.801 5.004)
0.228 0.244
(5.791 6.197)
0.010 0.020
(0.254 0.508)
0.016 0.050
0.406 1.270
45
0 8 TYP
0.008 0.010
(0.203 0.254)
0.053 0.069
(1.346 1.752)
0.014 0.019
(0.355 0.483)
0.004 0.010
(0.101 0.254)
0.050
(1.270)
BSC
S8 0392