Advanced Monolithic Systems AMS285-1.2/AMS385-1.2 MICROPOWER VOLTAGE REFERENCE DIODE FEATURES APPLICATIONS * 4 mV (0.3%) max. initial tolerance (A grade) * Operating Current 10 A to 20mA * Low Voltage Reference 1.235 * Max. 0.6 Dynamic Impedance (A grade) * Low Temperature Coefficient * 2.5V Device and Adjustable Device also available AMS285-2.5 and AMS285 series, respectively AMS385-2.5 and AMS385 series. * Battery Powered Systems * Instrumentation * A/D, D/A Converters * Temperature measurement * Current sources * Notebook/Personal Computer * Monitors/ VCR/ TV * Pagers GENERAL DESCRIPTION The AMS285-1.2/AMS385-1.2 are two-terminal micropower band-gap voltage reference diodes. They feature a very low dynamic impedance and good temperature coefficient, operating over a 10A to 20mA current range. On-chip trimming is used to provide tight voltage tolerance. Since the AMS285-1.2/AMS385-1.2 is a band-gap reference, uses only transistors and resistors, low noise and good long-term stability result. Careful design of the AMS285-1.2/AMS385-1.2 has made the device exceptionally tolerant of capacitive loading, making it easy to use in almost any reference application. The wide dynamic operating range allows its use with widely varying supplies with excellent regulation. The extremely low power drain of the AMS285-1.2/AMS385-1.2 makes these reference diodes useful for micropower circuitry. These voltage references can be used to make portable meters, regulators or general purpose analog circuitry with battery life approaching shelf life. Further more, the wide operating current allows it to replace older references with a tight tolerance part. The AMS285-1.2 is operational in the full industrial temperature range of -40C to 85C while AMS385-1.2 is operating over a 0C to 70C temperature range. The AMS285-1.2/AMS385-1.2 are available in TO-92, SO-8 and SOT-89 packages. ORDERING INFORMATION: TOL. 4mV 12mV 25mV 4mV 12mV 25mV PACKAGE TYPE TO-92 AMS285-1.2AN AMS285-1.2BN AMS285-1.2CN AMS385-1.2AN AMS385-1.2BN AMS385-1.2CN 8 LEAD SOIC AMS285-1.2AS AMS285-1.2BS AMS285-1.2CS AMS385-1.2AS AMS385-1.2BS AMS385-1.2CS SOT-89 AMS285-1.2AL AMS285-1.2BL AMS285-1.2CL AMS385-1.2AL AMS385-1.2BL AMS385-1.2CL OPERATING TEMPERATURE RANGE -40 to 85 C -40 to 85 C -40 to 85 C 0 to 70 C 0 to 70 C 0 to 70 C Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS285-1.2/AMS385-1.2 ABSOLUTE MAXIMUM RATINGS Reverse Current Forward Current Operating Temperature Range AMS285-1.2 AMS385-1.2 30mA 10mA Storage temperature Soldering information TO-92 package: 10 sec. SOIC package: Vapor phase (60 sec) Infrared (15 sec.) SOT-89 package: 10 sec. -40C to 85C 0C to 70C -55C to +150C 260C 215C 220C 265C ELECTRICAL CHARACTERISTICS Electrical Characteristics at IR = 100 A, and TA = +25C unless otherwise specified. Parameter Reverse Breakdown Voltage (Note 4) Reverse Dynamic Impedance (Note 4) Reverse Breakdown Voltage Change with current (Note 4) Conditions Min AMS285A-1.2 Typ Max 1.231 1.235 1.239 IR - 100 A, f =20Hz 0.2 0.60 10A IR 1mA 1mA IR 20mA 1.0 10 8 IR - 100 A, 10Hz f 10kHz Temperature Coeff. (Note 6) Long Term Stability (Note 5) 1.223 1.235 1.247 Min AMS285C-1.2 Typ Max 1.205 1.235 1.260 Units V IR - 100 A Min. Operating Current (Note 4) Wide Band Noise (Note 5) AMS285B-1.2 Typ Max Min TA=25C.1C T = 1000 Hr 1 1.0 10 10 20 8 1 10 20 8 60 60 60 25 50 100 20 20 20 1.0 20 mV 15 25 A A V 150 ppm/C ppm ELECTRICAL CHARACTERISTICS Electrical Characteristics at IR = 100 A, and TA = +25C unless otherwise specified. Parameter Reverse Breakdown Voltage (Note 4) Reverse Dynamic Impedance (Note 4) Reverse Breakdown Voltage Change with Current (Note 4) Conditions 1.231 1.235 1.239 IR - 100 A, f =20Hz 0.2 0.60 10A IR 1mA 1mA IR 20mA 1.0 10 8 IR - 100 A, 10Hz f 10kHz Temperature Coeff. (Note 6) Long Term Stability (Note 5) AMS385A-1.2 Typ Max Min AMS385B-1.2 Typ Max 1.223 1.235 1.247 Min AMS385C-1.2 Typ Max 1.205 1.235 1.260 Units V IR - 100 A Min. Operating Current (Note 4) Wide Band Noise (Note 5) Min TA=25C.1C T = 1000 Hr 1 1.0 20 10 20 8 1 10 20 8 60 60 60 25 50 100 20 20 20 1.0 20 mV 15 25 A A V 150 Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 ppm/C ppm AMS285-1.2/AMS385-1.2 Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Note 2: For elevated temperature operation, Tj max is: AMS285 AMS385 +125C +100C Thermal Resistance JA (junction to ambient) TO-92 170C/W (0.125" leads) SO-8 SOT-89 165C/W 160C/W Note 3: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at TA = TJ = 25C. Note 4: Guaranteed and 100% production tested. Note 5: Guaranteed but not 100% production tested. These limits are not used to calculate average outgoing quality levels. Note 6: The average temperature coefficient is defined as the maximum deviation of reference voltage at all measured temperatures between the operating TMAX and TMIN, divided by TMAX - TMIN. The measured temperatures are 0C, 25C, 70C, 85C. PIN CONNECTIONS TO-92 Plastic Package (N) 3 2 8L SOIC SO Package (S) N/C N/C N/C 7 6 5 + 8 1 1 2 3 N/C N/C N/C Bottom View SOT-89 (L) 4 - 3 2 1 N/C + - Top View Top View Micropower Reference from 9V Battery Reference from 1.5V Battery TYPICAL APPLICATIONS Wide Input Range Reference 9V VIN = 2.3V TO 30V 1.5V 500k 3k LM334 1.2V 1.2V AMS385-1.2 AMS385-1.2 4.3k OUT 1.24V AMS385-1.2 Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS285-1.2/AMS385-1.2 TYPICAL APPLICATIONS (Continued) 0C - 100C Thermometer 0C - 100C Thermometer Lower Power Thermometer * 150 150 M 1.3 TO 1.6V 0-100A M IOUT R2 1k LM334 R R2 1k V+ 1.5V (1.3-1.6V) R LM334 AMS385-1.2 V- R1 2k IOUT LM334 AMS385-1.2 V+ M 0-50A 8k TO 12k R1 4k V- R3 100 R3 50 * 2N3638 or 2N2907 select for inverse HFE 5 Select for operation at 1.3V IQ 600A to 900 A R4 220 1.3-1.6V AMS385-1.2 R4 100 Calibration Calibration 1. Short AMS385-1.2, adjust R3 for IOUT = temp at 1A/K 2. Remove short, adjust R2 for correct reading in C IQ at 1.3V 500 A IQ at 1.6V 2.4mA 1. Short AMS385-1.2, adjust R3 for IOUT = temp at 1.8A/K 2. Remove short, adjust R2 for correct reading in F Centigrade Thermometer Micropower* 10V Reference IQ VIN = 15V 2.2k + V LM334 V1.5V V1 R 2.3k V2 90k 25k 1M OUTPUT 1mV/ C 2 7 + 6 LM4250C 3 1.2k 27k 4 AMS385-1.2 10V 8 22M 150pF R1 1k 3.5M 500k AMS385-1.2 Calibration *IQ 20A standby current 1. Adjust R1 so that V1 = temp at 1mV/K. 2. Adjust V2 to 273.2mV. IQ for 1.3V to 1.6V battery voltage = 50A to 150A Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS285-1.2/AMS385-1.2 TYPICAL APPLICATIONS (Continued) Micropower Thermocouple Cold Junction Compensator V+ 5.1k LM334 1M 1% 2k 1% R Adjustment Procedure VMERCURY + CELL 1.345V TC ADJ 500 ZERO ADJ 100k AMS385-1.2 R2 1. Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature multiplied by the thermocouple Seebeck coefficient. 2. Adjust ZERO ADJ pot until voltage across R2 equals the thermocouple Seebeck coefficient multiplied by 273.2. R1 Thermocouple Type + THERMOCOUPLE + J T K S METER COLD JUNCTION ISO THERMAL WITH LM334 Seebeck Coefficient (mV/ C) R1 ( ) R2 Voltage Voltage ( ) Across R1 Across R2 @ 25C (mV) (mV) 52.3 42.8 40.8 6.4 523 432 408 63.4 1.24k 1k 953 150 15.60 12.77 12.17 1.908 14.32 11.78 11.17 1.766 Typical supply current 50A Precision 1 A to 1mA Current Sources AMS385-1.2 30V AMS385-1.2 C1 150pF R1 100k R1 100k 2 - + 2 - 7 6 LM312 7 6 LM312 3 C1 150pF 3 + 4 4 IOUT* IOUT* R2 1.5V TO 27V R2 -1.5V TO -27V -30V *IOUT =1.23V/R2 Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS285-1.2/AMS385-1.2 TYPICAL PERFORMANCE CHARACTERISTICS Reverse Characteristics TA =125 C 6 4 TA =25 C 2 TA =-55 C 0 10 T A =125 C TA =-55 C 1 TA =25 C 0.1 -2 0.1 1 10 REVERSE CURRENT (mA) TA =25 C TA =-55 C Reverse Dynamic Impedance 1.250 1.240 1.230 1.220 100 SHARP CUTOFF FILTER 1.5 VOLTAGE SWING (V) AMS385-1.2 NOISE (nV/Hz) 100A 20 0 100 10 10k 100k 1k FREQUENCY (Hz) 1M IR= 100 A 40 10 1 2.0 600 SINGLE POLE LOW PASS OUTPUT 30 10 Response Time 700 IR= 100 A 50 100 Noise Voltage Filtered Output Noise 70 60 T A =25 C I R= 100 A 1k 0.1 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE ( C) 100 0.1 1 10 100 FORWARD CURRENT (mA) 10k I R= 100 A 0.1 0.1 1 10 REVERSE CURRENT (mA) TA =125 C 0.01 DYNAMIC IMPEDANCE () REFERENCE VOLTAGE (V) TA =125 C 0.01 T A =25 C 0.4 0.2 0.4 0.6 0.8 1.0 1.2 1.4 REVERSE VOLTAGE (V) 1.260 1 0.8 Temperature Drift of 3 Representative Units 100 10 TA =-55 C 0 0 100 Reverse Dynamic Impedance DYNAMIC IMPEDANCE () 1.2 FORWARD VOLTAGE (V) 8 0.01 INTEGRATED NOISE (V) Forward Characteristics 100 REVERSE CURRENT (A) OUTPUT VOLTAGE CHANGE (mV) Reverse Characteristics 10 500 400 300 200 1.0 100k 0.5 0 OUTPUT ~ ~ ~ ~ 10 INPUT 100 0 1k 10k 100k CUTOFF FREQUENCY (Hz) OUTPUT INPUT 0 10 100 1k 10k FREQUENCY (Hz) 100k 0 200 400 TIME (s) 600 Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS285-1.2/AMS385-1.2 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted. 3 LEAD TO-92 PLASTIC PACKAGE (N) 0.1800.005 (4.5720.127) 0.0600.005 (1.5240.127) DIA 0.0600.010 (1.5240.254) 0.90 (2.286) NOM 0.1800.005 (4.5720.127) 0.1400.010 (3.5560.127) 5 NOM 0.500 (12.70) MIN 0.050 (1.270) MAX UNCONTROLLED LEAD DIMENSIONS 0.0150.002 (0.3810.051) 0.0160.003 (0.4060.076) 0.0500.005 (1.2700.127) 10 NOM N (TO-92 ) AMS DRW# 042391 8 LEAD SOIC PLASTIC PACKAGE (S) 0.189-0.197* (4.801-5.004) 8 7 6 5 0.228-0.244 (5.791-6.197) 0.150-0.157** (3.810-3.988) 1 2 3 4 0.010-0.020 x 45 (0.254-0.508) 0.053-0.069 (1.346-1.752) 0.004-0.010 (0.101-0.254) 0.014-0.019 (0.355-0.483) 0.008-0.010 (0.203-0.254) 0.050 (1.270) TYP 0-8 TYP 0.016-0.050 (0.406-1.270) S (SO-8 ) AMS DRW# 042293 *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS285-1.2/AMS385-1.2 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued). SOT-89 PLASTIC PACKAGE (L) 0.173-0.181 (4.40-4.60) 0.055-0.063 (1.40-1.60) 0.014-0.017 (0.35-0.44) 0.064-0.072 (1.62-1.83) 0.155-0.167 (3.94-4.25) 0.084-0.090 (2.13-2.29) 0.090-0.102 (2.29-2.60) 0.035-0.047 (0.89-1.20) 0.059 (1.50) BSC 0.014-0.019 (0.36-0.48) 0.017-0.022 (0.44-0.56) L (SOT-89 ) AMS DRW# 042392 0.118 (3.00) BSC Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140