FEATURES DESCRIPTIO TYPICAL APPLICATIO. LM / LM /LM Micropower Voltage Reference APPLICATIO S
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1 Micropower Voltage Reference FEATRES 1µA to 2mA Operating Range Guaranteed 1% Initial Voltage Tolerance Guaranteed 1Ω Dynamic Impedance Very Low Power Consumption APPLICATIO S Portable Meter References Portable Test Instruments Battery Operated Systems Current Loop Instrumentation DESCRIPTIO The LM 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 operating specifications at currents as low as 1µA. The nominal voltage is 1.235V with both 1% and 2% tolerances available. Some additional features are: maximum dynamic impedance of 1Ω, low noise and excellent stability over time and temperature. Advanced design, processing and testing techniques make Linear s LM a superior choice over previous designs. A micropower 5V reference application is shown below. For guaranteed TC, micropower references, see the LT134 data sheet., LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Micropower 5V Reference Reverse Voltage Change with Current V + LM334 V LM R 1M 1% 5.6k LT V IN 7V TO 15V 6 15pF 5V 3.1M 1% OTPT VOLTAGE CHANGE (mv) T A = 25 C 185/285/385 TA1a REVERSE CRRENT (ma) 185/285/385 TA1b 1
2 ABSOLTE AXI RATI GS W W W Operating Temperature Range LM (OBSOLETE) C to 125 C LM C to 85 C LM C to 7 C Storage Temperature Range C to 15 C Lead Temperature (Soldering, 1 sec)... 3 C Reverse Breakdown Current... 3mA Forward Current... 1mA PACKAGE/ORDER I FOR ATIO W BOTTOM VIEW 1 2 H PACKAGE 2-LEAD TO-46 METAL CAN T JMAX = 15 C, θ JA = 44 C/W, θ JC = 8 C/W (NOTE 3) OBSOLETE PACKAGE Consider the S8 or Z Packages for Alternate Source ORDER PART NMBER LM185H-1.2 LM285H-1.2 LM385H-1.2 LM385BH-1.2 NC 1 NC 2 NC 3 TOP VIEW NC 4 5 NC (DO S8 PACKAGE NOT SE) 8-LEAD PLASTIC SO T JMAX = 15 C, θ JA = 19 C/W BOTTOM VIEW Z PACKAGE 3-LEAD PLASTIC TO-92 T JMAX = 15 C, θ JA = 16 C/W (NOTE 3) ORDER PART NMBER LM285Z-1.2 LM385Z-1.2 LM385BZ-1.2 ORDER PART NMBER LM385BS8-1.2 LM385S8-1.2 S8 PART MARKING B Consult LTC Marketing for parts specified with wider operating temperature ranges. 2
3 ELECTRICAL CHARACTERISTICS Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Selected devices with guaranteed maximum temperature coefficient are available upon request. LM / The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T A = 25 C. For the LM T MIN = 55 C and T MAX = 125 C. For LM T MIN = 4 C and T MAX = 85 C.For LM T MIN = C and T MAX = 7 C. For MIL-STD components, please refer to LTC883C data sheet for test listing and parameters. LM /LM LM /LM385B-1.2 SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX NITS V Z Reverse Breakdown Voltage T A = 25 C, I MIN I R 2mA LM V LM V LM385B-1.2 (Note 3) V V Z Average Temperature Coefficient I MIN I R 2mA (Notes 2, 3) 2 2 ppm/ C Temp I MIN Minimum Operating Current T MIN T A T MAX µa V Z Reverse Breakdown Voltage I MIN I R 1mA I R Change with Current T A = 25 C 1 1 mv T MIN T A T MAX mv 1mA I R 2mA T A = 25 C 1 1 mv T MIN T A T MAX 2 25 mv r Z Reverse Dynamic Impedance I R = 1µA T A =25 C Ω T MIN T A T MAX Ω e n Wideband Noise (RMS) I R = 1µA, 1Hz f 1kHz 6 6 µv V Z Long Term Stability I R = 1µA, T A = 25 C ±.1 C 2 2 ppm/khr Time Note 3: For applications requiring low initial tolerance guaranteed over temperature consult the LT14 data sheet. 3
4 TYPICAL PERFOR A CE CHARACTERISTICS W 1 Reverse Characteristics 55 C TO 125 C 1.2 Foward Characteristics T A = 25 C REVERSE CRRENT (µa) 1 1 FORWARD VOLTAGE (V) REVERSE VOLTAGE (V) 185/285/385 G FORWARD CRRENT (ma) 185/285/385 G2 REVERSE VOLTAGE (V) Temperature Drift Reverse Dynamic Impedance Reverse Dynamic Impedance DYNAMIC IMPEDANCE (Ω) C TO 125 C f = 25Hz DYNAMIC IMPEDANCE (Ω) 1k 1k T A = 25 C I R = 1µA TEMPERATRE ( C) 185/285/385 G REVERSE CRRENT (ma) 185/285/385 G k 1k 1k 1M FREQENCY (Hz) 185/285/385 G5 NOISE (nv/ Hz) Noise Voltage Filtered Output Noise Response Time 7 2. I R = 1µA I R = 1µA 6 RC LOW PASS 1.5 OTPT INTEGRATED NOISE (µvrms) 1µA 5 R 4 C VOLTAGE (V) V IN 36k INPT V OT 1 1 1k 1k 1k FREQENCY (Hz) 1 1k 1k 1k CTOFF FREQENCY (Hz) TIME (µs) 185/285/385 G6 185/285/385 G7 185/285/385 G8 4
5 SCHE ATIC DIAGRA W W + 7.5k Q13 Q3 Q4 Q7 Q12 2k Q1 2pF 2pF Q11 5k Q2 Q5 6k Q1 Q9 3k Q6 Q8 Q14 1k 5Ω 6k 185/285/385 SD 5
6 PACKAGE DESCRIPTIO H Package 2-Lead and 3-Lead TO-46 Metal Can (Reference LTC DWG # ) REFERENCE PLANE ( ) ( ).5 (12.7) MIN.16.21** ( ) DIA ( ) *.25 (.635) MAX.5 (1.27) TYP ( ) OBSOLETE PACKAGE.1 (2.54) TYP PIN (1.27) TYP FOR 3-LEAD PACKAGE ONLY ( ) H2/3(TO-46) 198 * LEAD DIAMETER IS NCONTROLLED BETWEEN THE REFERENCE PLANE AND.45" BELOW THE REFERENCE PLANE ** FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (.46.61).6 ±.5 (1.524±.127) DIA.18 ±.5 (4.572 ±.127) Z Package 3-Lead Plastic TO-92 (Similar to TO-226) (Reference LTC DWG # ).18 ±.5 (4.572 ±.127).9 (2.286) NOM.5 (12.7) MIN.5 NCONTROLLED (1.27) LEAD DIMENSION MAX 5 NOM.5 (1.27) BSC.16 ±.3 (.46 ±.76).6 ±.1 (1.524 ±.254).14 ±.1 (3.556 ±.127).15 ±.2 (.381 ±.51) Z3 (TO-92) /.4 ( /.1) 2 PLCS TO-92 TAPE AND REEL REFER TO TAPE AND REEL SECTION OF LTC DATA BOOK FOR ADDITIONAL INFORMATION 1 NOM 6
7 PACKAGE DESCRIPTIO S8 Package 8-Lead Plastic Small Outline (Narrow.15 Inch) (Reference LTC DWG # ) * ( ) ( ) ** ( ) SO ( ).1.2 ( ) 45 8 TYP ( ).4.1 ( ).16.5 ( ) * DIMENSION DOES NOT INCLDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED.6" (.152mm) PER SIDE ** DIMENSION DOES NOT INCLDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED.1" (.254mm) PER SIDE ( ) TYP.5 (1.27) BSC 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 its circuits as described herein will not infringe on existing patent rights. 7
8 TYPICAL APPLICATIO S Micropower Reference for 9V Battery 1.2V Reference from 1.5V Battery 9V 51k 1.23V LM V 3k 1.23V LM /285/385 TA2 185/285/385 TA3 RELATED PARTS PART NMBER DESCRIPTION COMMENTS LT Micropower Shunt Reference.3% Initial Accuracy LT V Micropower Shunt Reference 4ppm/ C Max Temperature Coefficient fa LT/CP K REV A PRINTED IN SA Linear Technology Corporation 163 McCarthy Blvd., Milpitas, CA (48) FAX: (48) LINEAR TECHNOLOGY CORPORATION 1985
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