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Details, datasheet, quote on part number:LM185-2.5M
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Datasheet text preview:
LM185-2.5/ LM285-2.5/LM385-2.5 Micropower Voltage Reference
FEATURES
s s s s
DESCRIPTIO
20µA to 20mA Operating Range Guaranteed 1% Initial Voltage Tolerance Guaranteed 1 Dynamic Impedance Very Low Power Consumption
APPLICATIO 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 20µA. 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Thermocouple Cold Junction Compensator
IQ 50µA 16k 1M 2 MERCURY CELLS 2.6V LM385-2.5 950 450 10k ADJUST FOR 12.17mV AT 25°C 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 55°C TA +125°C 12 8 4 0 4 0.01 0.1 1 10 REVERSE CURRENT (mA) 100
LM185-2.5 TA02
U
U
1
LM185-2.5/ LM285-2.5/LM385-2.5 ABSOLUTE AXI U RATI GS U WW W
(Note 1)
Reverse Breakdown Current ........ 30mA Forward Current ........ 10mA Operating Temperature Range LM185-2.5 (OBSOLETE) ... 55°C to 125°C LM285-2.5 ..... 40°C to 85°C LM385-2.5 .......... 0°C to 70°C
Storage Temperature Range LM185-2.5 (OBSOLETE) ... 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
PACKAGE/ORDER I FOR ATIO
BOTTOM VIEW
ORDER PART NUMBER LM185H-2.5 LM285H-2.5 LM385H-2.5 LM385BH-2.5
(NOTE 3)
H PACKAGE 2-LEAD TO-46 METAL CAN
TJMAX = 150°C, JA = 440°C/W, JC = 80°C/W
OBSOLETE PACKAGE
Consider the S8 or Z Packages for Alternate Source
TOP VIEW NC NC NC 1 2 3 4 8 7 6 5 NC (DO NOT USE) NC
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 150°C, JA = 220°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
U
BOTTOM VIEW
W
U
ORDER PART NUMBER LM285Z-2.5 LM385Z-2.5 LM385BZ-2.5
(NOTE 3)
Z PACKAGE 3-LEAD TO-92 PLASTIC TJMAX = 100°C, JA = 160°C/W
ORDER PART NUMBER LM285S8-2.5 LM385S8-2.5 LM385BS8-2.5 S8 PART MARKING 2852 3852 3852B
LM185-2.5/ LM285-2.5/LM385-2.5
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 2)
SYMBOL VZ PARAMETER Reverse Breakdown Voltage CONDITIONS TA = 25°C, 20µA IR 20mA LM185-2.5/285-2.5 LM385-2.5 LM385B-2.5 (Note 3) 20µA IR 20mA (Note 3) TMIN TA TMAX 20µA IR 1mA TA = 25°C TMIN TA TMAX 1mA IR 20mA TA = 25°C TMIN TA TMAX rZ Reverse Dynamic Impedance IR = 100µA (Note 4) TA = 25°C TMIN TA TMAX 10Hz f 10kHz, IR = 100µA TA = 25°C ± 0.1°C, IR = 100µA
q
ELECTRICAL CHARACTERISTICS
LM185-2.5/285-2.5 MIN TYP MAX 2.462 2.500 2.538
LM385-2.5/385B-2.5 MIN TYP MAX
UNITS V V V ppm/°C
2.425 2.462 20 8 20 1.0 1.5 10 20 0.2
q
2.500 2.575 2.500 2.538 20 8 20 2.0 2.5 20 25 0.4 120 20 1.0 1.5
VZ Temp I MIN VZ IR
Average Temperature Coefficient Minimum Operating Current Reverse Breakdown Voltage Change With Current
µA mV mV mV mV µV ppm/kHr
q
q
0.6 1.5
en VZ Time
Wide Band Noise (RMS) Long Term Stability
120 20
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: All specifications are for TA = 25°C unless otherwise noted. For the LM185-2.5 TMIN = 55°C and TMAX = 125°C. For LM285-2.5, TMIN = 40°C and TMAX = 85°C. For LM385-2.5, TMIN = 0°C and TMAX = 70°C.
Note 3: 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 4: Guaranteed but not tested.
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