AMS9491

Advanced Monolithic Systems FEATURES • ±10 mV max. initial tolerance (A grade) • Operating Current 10µA to 20mA • Low Voltage Reference 1.235 • Max. 0.6Ω Dynamic Impedance (A grade) • Low Temperature Coefficient AMS9491 1.235V VOLTAGE REFERENCE RoHS compliant APPLICATIONS • Battery Powered Systems • Instrumentation • A/D, D/A Converters • Temperature measurement • Current sources • Pagers GENERAL DESCRIPTION The AMS9491 is a two-terminal micropower band-gap voltage reference diode. It feature a very low dynamic impedance and good temperature coefficient, operating over a 10µA to 20mA current range. On-chip trimming is used to provide tight voltage tolerance. Since the AMS9491 is a band-gap reference, uses only transistors and resistors, low noise and good long-term stability result. Careful design of the AMS9491 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 AMS9491 makes this reference diode useful for micropower circuitry. The AMS9491 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 AMS9491 is operating over a 0°C to 70°C temperature range and is available in TO-92 and SO-8 packages. ORDERING INFORMATION: TOL. PACKAGE TYPE 8 LEAD SOIC AMS9491AS AMS9491BS OPERATING TEMPERATURE RANGE 0 to 70° C 0 to 70° C TO-92 ±10mV AMS9491AN ±20mV AMS9491BN PIN CONNECTIONS TO-92 Plastic Package (N) 8L SOIC SO Package (S) + 8 N/C N/C N/C 7 6 5 3 1 1 2 3 N/C N/C N/C 4 - Bottom View Top View Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS9491 ABSOLUTE MAXIMUM RATINGS (Note 1) Reverse Current Forward Current Operating Temperature Range Storage temperature 30mA 10mA 0°C to 70°C -55°C to +150°C Soldering information (25 sec .) 265°C ELECTRICAL CHARACTERISTICS Electrical Characteristics at IR = 100 µA, and TA = +25°C unless otherwise specified. Parameter Reverse Breakdown Voltage (Note 4) Reverse Dynamic Impedance (Note 4) Reverse Breakdown Voltage Change with current (Note 4) Min. Operating Current (Note 4) Wide Band Noise (Note 5) Temperature Coeff. (Note 6) Long Term Stability (Note 5) TA=25°C±.1°C T = 1000 Hr 20 20 ppm IR - 100 µA, 10Hz ≤ f ≤ 10kHz Conditions Min IR - 100 µA 1.215 AMS9491A Typ 1.235 0.2 Max 1.255 0.6 2.0 20 8 10 20 Min 1.215 AMS9491B Typ 1.235 0.2 Max 1.255 0.6 2.0 20 8 10 20 Units V Ω mV µA µV IR - 100 µA, f =20Hz 10µA ≤IR ≤1mA 1mA ≤IR ≤20mA 60 60 50 100 ppm/°C 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: Thermal resistance is as follows: Thermal Resistance TO-92 170°C/W (0.125” leads) SO-8 165°C/W ϕ JA (junction to ambient) Note 3: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at TA = TJ = 25°C. 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 0°C, 25°C, 70°C. Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS9491 TYPICAL APPLICATIONS Wide Input Range Reference Micropower Reference from 9V Battery Reference from 1.5V Battery VIN = 2.3V TO 30V 9V 1.5V 500k 3k 1.2V AMS9491 LM334 1.2V 4.3k AMS9491 OUT 1.24V AMS9491 0°C - 100°C Thermometer Lower Power Thermometer 0°C - 100°C Thermometer * 150 M 1.3 TO 1.6V‡ 150 0-100µA M IOUT R1 4k R2 1k R AMS9491 R3 100 R4 220 LM334 AMS9491 8k TO 12k† 0-50µA IOUT M R1 2k R2 1k R AMS9491 R3 50 R4 100 V+ LM334 V- 1.5V (1.3-1.6V)† V+ LM334 V- 1.3-1.6V * 2N3638 or 2N2907 select for inverse HFE ≅ 5 † Select for operation at 1.3V ‡ IQ ≅ 600µA to 900 µA Calibration 1. Short AMS9491, adjust R3 for IOUT = temp at 1µA/°K 2. Remove short, adjust R2 for correct reading in °C † IQ at 1.3V ≅ 500 µA IQ at 1.6V ≅ 2.4mA Calibration 1. Short AMS9491, adjust R3 for IOUT = temp at 1.8µA/°K 2. Remove short, adjust R2 for correct reading in °F Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS9491 TYPICAL APPLICATIONS (Continued) Centigrade Thermometer Micropower* 10V Reference IQ VIN = 15V 2.2k V + LM334 V1.5V† R 2.3k V1 V2 90k 25k 1M 2 + 7 LM4250C 3 8 4 22M 150pF 3.5M 6 10V OUTPUT 1mV/° C 1.2k 27k AMS9491 R1 1k AMS9491 500k Calibration 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 = 50µA to 150µA *IQ ≅ 20µA standby current Micropower Thermocouple Cold Junction Compensator V+ LM334 2k 1% 5.1k 1M 1% V- R Adjustment Procedure TC ADJ 500 MERCURY + CELL 1.345V AMS9491 ZERO ADJ 100k 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. Thermocouple Type Seebeck Coefficient (mV/ °C) 52.3 42.8 40.8 6.4 R1 ( Ω) R2 Voltage Voltage (Ω) Across R1 Across R2 @ 25°C (mV) (mV) 1.24k 1k 953Ω 150Ω 15.60 12.77 12.17 1.908 14.32 11.78 11.17 1.766 R1 + THERMOCOUPLE + COLD JUNCTION ISO THERMAL WITH LM334 METER J T K S 523 432 408 63.4 Typical supply current 50µA Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS9491 TYPICAL APPLICATIONS (Continued) Precision 1µA to 1mA Current Sources AMS9491 30V AMS9491 C1 150pF C1 150pF 2 LM312 3 + 4 7 6 R1 100k 2 R1 100k LM312 7 6 4 IOUT* 1.5V TO 27V 3 IOUT* -1.5V TO -27V + R2 -30V R2 *IOUT =1.23V/R2 Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS9491 TYPICAL PERFORMANCE CHARACTERISTICS Reverse Characteristics OUTPUT VOLTAGE CHANGE (mV) 10 8 6 4 2 0 -2 0.01 0.1 1 10 REVERSE CURRENT (mA) 100 TA =25° C TA =-55° C Reverse Characteristics 100 REVERSE CURRENT ( µ A) FORWARD VOLTAGE (V) 1.2 Forward Characteristics TA =125° C TA =-55° C 10 TA =125° C TA =-55° C 0.8 1 TA =25° C 0.4 TA =25° C TA =125° C 0.1 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 REVERSE VOLTAGE (V) Temperature Drift of 3 Representative Units 1.260 DYNAMIC IMPEDANCE ( Ω ) REFERENCE VOLTAGE (V) IR= 100µA 0 0.01 0.1 1 10 100 FORWARD CURRENT (mA) Reverse Dynamic Impedance 100 DYNAMIC IMPEDANCE ( Ω ) Reverse Dynamic Impedance 10k 1k 100 10 TA =25° C IR= 100µA 1.250 10 TA =125° C 1.240 1 TA =-55° C TA =25° C 1.230 1 0.1 1.220 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (° C) Noise Voltage 700 0.1 0.01 0.1 1 10 REVERSE CURRENT (mA) 100 10 100 10k 100k 1k FREQUENCY (Hz) 1M Filtered Output Noise 70 IR= 100µA Response Time 2.0 IR= 100µA INTEGRATED NOISE ( µ V) 60 50 40 30 20 10 0 100 AMS9491 100µA SINGLE POLE LOW PASS 600 VOLTAGE SWING (V) NOISE (nV/√Hz) 500 400 300 200 100 0 1.5 1.0 0.5 0 OUTPUT INPUT 100k OUTPUT OUTPUT ~ ~ INPUT ~ ~ 10 SHARP CUTOFF FILTER 0 10 100 1k 10k FREQUENCY (Hz) 100k 0 200 400 TIME ( µ s) 600 1k 10k CUTOFF FREQUENCY (Hz) 100k Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS9491 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted. 3 LEAD TO-92 PLASTIC PACKAGE (N) 0.060±0.005 (1.524±0.127) DIA 0.180±0.005 (4.572±0.127) 0.060±0.010 (1.524±0.254) 0.140±0.010 (3.556±0.127) 0.180±0.005 (4.572±0.127) 0.90 (2.286) NOM 5° NOM 0.500 (12.70) MIN 10° NOM 0.050 (1.270) MAX UNCONTROLLED LEAD DIMENSIONS 0.050±0.005 (1.270±0.127) 0.016±0.003 (0.406±0.076) 0.015±0.002 (0.381±0.051) 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 0.053-0.069 (1.346-1.752) 0.004-0.010 (0.101-0.254) 0.008-0.010 (0.203-0.254) 0.010-0.020 x 45° (0.254-0.508) 0°-8° TYP 0.014-0.019 (0.355-0.483) 0.050 (1.270) 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. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723