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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 |
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