View LM385-25_147720.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

LM185-2.5/ LM285-2.5/LM385-2.5 Micropower Voltage Reference
FEATURES
s s s s
DESCRIPTIO
20A to 20mA Operating Range Guaranteed 1% Initial Voltage Tolerance Guaranteed 1 Dynamic Impedance Very Low Power Consumption
APPLICATI
s s s s s
S
Portable Meter References Portable Test Instruments Battery-Operated Systems Panel Meters Current Loop Instrumentation
The LM185-2.5 is a two-terminal band gap reference diode that has been designed for applications which require precision performance with micropower operation. The device provides guaranteed operation specifications at currents as low as 20A. 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 temperature. The advanced design, processing and testing techniques make Linear's LM185-2.5 a superior choice over previous designs. A circuit for cold junction compensation of a thermocouple is shown below. For applications requiring guaranteed temperature drift, see the LT1034 data sheet.
TYPICAL APPLICATI
Thermocouple Cold Junction Compensator
IQ 50A 16k 1M 2 MERCURY CELLS 2.6V LM385-2.5 950 450 10k ADJUST FOR 12.17mV AT 25C ACROSS 450
LM185-2.5 TA01
OUTPUT VOLTAGE CHANGE (mV)
VIN LM334 100k W.W. ZERO V- RSET
2k
TYPE K
+ -
METER
U
Reverse Voltage Change
16 -55C TA +125C 12 8 4 0 -4 0.01 0.1 1 10 REVERSE CURRENT (mA) 100
LM185-2.5 TA02
UO
UO
1
LM185-2.5/ LM285-2.5/LM385-2.5 ABSOLUTE AXI U RATI GS
Storage Temperature Range LM185-2.5 .................................... - 65C to 150C LM285-2.5 .................................... - 65C to 150C LM385-2.5 .................................... - 65C to 150C Lead Temperature (Soldering, 10 sec.)................ 300C
Reverse Breakdown Current ................................ 30mA Forward Current................................................... 10mA Operating Temperature Range LM185-2.5 ..................................... -55C to 125C LM285-2.5 ...................................... - 40C to 85C LM385-2.5 ........................................... 0C to 70C
PACKAGE/ORDER I FOR ATIO
TOP VIEW NC NC NC 1 2 3 4 8 7 6 5 NC (DO NOT USE) NC
S8 PACKAGE 8-LEAD PLASTIC SO
LM185-2.5 PO03
ORDER PART NUMBER LM285S8-2.5 LM385S8-2.5 LM385BS8-2.5 PART MARKING 2852 3852 3852B
BOTTOM VIEW
1
H PACKAGE 2-LEAD TO-46 METAL CAN
LM185-2.5 PO01
ELECTRICAL CHARACTERISTICS
SYMBOL VZ PARAMETER Reverse Breakdown Voltage CONDITIONS
(See Note 1)
LM185-2.5/285-2.5 MIN TYP MAX 2.462 2.500 2.538 2.425 2.462 20
q
TA = 25C, 20A IR 20mA LM185-2.5/285-2.5 LM385-2.5 LM385B-2.5 (Note 2) 20A IR 20mA (Note 2) TMIN TA TMAX 20A IR 1mA TA = 25C TMIN TA TMAX 1mA IR 20mA TA = 25C TMIN TA TMAX
VZ Temp IMIN VZ IR
Average Temperature Coefficient Minimum Operating Current Reverse Breakdown Voltage Change With Current
rZ
Reverse Dynamic Impedance
IR = 100A (Note 3) TA = 25C TMIN TA TMAX 10Hz f 10kHz, IR = 100A TA = 25C 0.1C, IR = 100A
en VZ Time
Wide Band Noise (RMS) Long Term Stability
The q denotes specifications which apply over the operating temperature range. Note 1: All specifications are for TA = 25C unless otherwise noted. For the LM185-2.5 TMIN = - 55C and TMAX = 125C. For LM285-2.5, TMIN = - 40C and TMAX = 85C. For LM385-2.5, TMIN = 0C and TMAX = 70C.
2
U
U
W
WW
U
W
ORDER PART NUMBER LM185H-2.5 LM285H-2.5 LM385H-2.5 LM385BH-2.5 (NOTE 2)
BOTTOM VIEW 3 2 1
ORDER PART NUMBER LM285Z-2.5 LM385Z-2.5 LM385BZ-2.5 (NOTE 2)
2
Z PACKAGE 3-LEAD TO-92 PLASTIC
LM185-2.5 PO02
LM385-2.5/385B-2.5 MIN TYP MAX
UNITS V V V ppm/C
2.500 2.575 2.500 2.538 20
8
20 1.0 1.5 10 20
8
20 2.0 2.5 20 25
A mV mV mV mV V ppm/kHr
q
q
0.2
q
0.6 1.5
0.4 120 20
1.0 1.5
120 20
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.
LM185-2.5/ LM285-2.5/LM385-2.5
TYPICAL PERFOR A CE CHARACTERISTICS
Reverse Characteristics
100 -55C TO 125C
1.6 TA = 25C 1.2
REFERENCE VOLTAGE (V)
REVERSE CURRENT (A)
10
FORWARD VOLTAGE (V)
1
0.1 0 0.5 1.0 1.5 2.0 REVERSE VOLTAGE (V) 2.5 3.0
Reverse Dynamic Impedance
1000 f = 25Hz -55C TO 125C
DYNAMIC IMPEDANCE ()
100
DYNAMIC IMPEDANCE ()
100
NOISE (nV/Hz)
10
1
0.1 0.01
0.1 1 10 REVERSE CURRENT (mA)
Filtered Output Noise
120
100mA
INTEGRATED NOISE (VRMS)
100 80 60 40
R
C
VOLTAGE (V)
RC LOW PASS 20 0 100
1k
10k
CUTOFF FREQUENCY (Hz)
LM185-2.5 * TPC07
UW
LM185-2.5 * TPC01
LM185-2.5 * TPC05
Forward Characteristics
2.525 2.520 2.515 2.510 2.505 2.500 2.495 2.490 2.485
0 0.01 0.1 1 10 FORWARD CURRENT (mA) 100
Temperature Drift
0.8
0.4
2.480 -55 -35 -15
5 25 45 65 85 105 125 TEMPERATURE (C)
LM185-2.5 * TPC03
LM185-2.5 * TPC02
Reverse Dynamic Impedance
10k TA = 25C IR = 100A 1k
Noise Voltage
1400 1200 1000 800 600 400
10
1
200 0
10 100 10k 1k FREQUENCY (Hz) 100k 1M
100
0.1
10
100
1k 10k FREQUENCY (Hz)
100k
LM185-2.5 * TPC05
LM185-2.5M * TPC06
Response Time
4.0 3.0 2.0 1.0 0 5V INPUT
100k
VIN
OUTPUT
24k VOUT
0 0 100 TIME (S)
LM185-2.5 * TPC08
500
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 representation that the interconnection of circuits as described herein will not infringe on existing patent rights.
3
LM185-2.5/ LM285-2.5/LM385-2.5
SCHE ATIC DIAGRA
7.5k Q4 Q3 20pF Q1 Q7 20pF Q11 600k Q10 Q2 Q5 Q9 Q6 100k 500 60k Q8 Q14 500k 50k 500k Q12
TYPICAL APPLICATI
+
9V
Q13 200k
220k
LM334
2.5V LM385-2.5
300k
REFERENCE FROM A 9V BATTERY
OPERATION OVER A WIDE SUPPLY RANGE
LM185-2.5 TA03
-
LM185-2.5 SD01
PACKAGE DESCRIPTIO
H Package, 2-Lead TO-46 Metal Can
0.209 - 0.219 (5.309 - 5.537) 0.178 - 0.195 (4.521 - 4.953) 0.015 0.500 (0.381) (12.700) MAX MIN
Dimensions in inches (millimeters) unless otherwise noted. Z package, 3-Lead TO-92 Plastic
0.060 0.010 (1.524 0.254)
0.080 - 0.100 (2.032 - 2.540)
0.140 0.010 (3.556 0.127)
10 NOM 0.060 0.005 (1.524 0.127) DIA 0.180 0.005 (4.572 0.127) 0.90 (2.286) NOM
0.025 (0.635) MAX 0.016 - 0.019 (0.406 - 0.483) DIA 0.100 (2.540) TYP
0.180 0.005 (4.572 0.127)
0.050 (1.270) TYP
0.050 (1.270) TYP
0.500 (12.79) MIN
FOR 3-LEAD PACKAGE ONLY 45 0.036 - 0.046 (0.914 - 1.168) 0.028 - 0.048 (0.711 - 1.219)
H3(46) 0592
0.050 (1.270) MAX UNCONTROLLED LEAD DIA 0.020 0.003 (0.508 0.076) 0.016 0.03 (0.406 0.076)
0.050 0.005 (1.270 0.127)
TJMAX
JA
JC
TJMAX
JA
150C 440C/W 80CW
100C 160C/W
S8 package, 8-Lead Plastic SOIC
0.189 - 0.197 (4.801 - 5.004) 0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0.016 - 0.050 0.406 - 1.270 0.053 - 0.069 (1.346 - 1.752) 0.004 - 0.010 (0.101 - 0.254) 0.228 - 0.244 (5.791 - 6.197) 0.150 - 0.157 (3.810 - 3.988) 8 7 6 5
0- 8 TYP
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) BSC
TJMAX
JA
1 2 3 4
150C 220C/W
4
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977
(c) LINEAR TECHNOLOGY CORPORATION 1992
UO
U
W
W
S
3.7V V + 30V R 2.7k 2.5V LM385-2.5
V+
5 NOM
0.015 0.02 (0.381 0.051)
Z3 1191
S8 0392
LT/GP 0892 1K REV B

▲Up To Search▲

Price & Availability of LM385-25

	To Download LM385-25 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .