Advanced Monolithic Systems AMS124 MICROPOWER SHUNT VOLTAGE REFERENCE FEATURES APPLICATIONS • Low Temperature Coefficient • Low Output Noise • Operating Current 50µ µ A to 4mA • Low Dynamic Impedance • Tight Output Voltage Tolerance • Available in the sub-miniature SOT-23 Package • Battery Powered Systems • Instrumentation • Energy Management • Product Testing • Precision Audio Components • Data Acquisition Systems GENERAL DESCRIPTION The AMS124 is a two-terminal micropower band-gap voltage reference diode featuring low dynamic impedance and good temperature coefficient, operating over a 50µA to 4mA current range. On-chip trimming is used to provide tight voltage tolerance. Since the AMS124 band-gap reference uses only transistors and resistors, low noise and good long term stability result. The wide dynamic operating range allows its use with widely varying supplies with excellent regulation. These voltage references can be used to make portable meters, regulators or general purpose analog circuitry. The AMS124 is operational in the full industrial temperature range of -40°C to 85°C and is available in small space saving SOT-23 package. ORDERING INFORMATION: MAX. TEMPCO 50ppm/°C 100ppm/°C PACKAGE TYPE 3 LEAD SOT-23 AMS124AM AMS124BM OPERATING TEMP. RANGE -40 to +85°C -40 to +85°C PIN CONNECTIONS 3L SOT-23 (M) 3 * 1 + 2 - *This pin must be left floating or connected to pin 2 Top View Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS124 ABSOLUTE MAXIMUM RATINGS (Note 1) Reverse Current Forward Current Lead Temperature SOT-23 packages: Vapor phase (60 sec) Infrared (15 sec.) 5mA 10mA Storage temperature Internal Power Dissipation (PD) SOT-23 Package Thermal Resistance (θJA) SOT-23 Package 215°C 220°C -65°C to +150°C 0.28W 410°C/W ELECTRICAL CHARACTERISTICS Electrical Characteristics at IR =500 µA and TA = +25°C unless otherwise specified. Parameter Conditions Output Voltage AMS124A Min. Typ. Max. AMS124B Min. Typ. Max. 1.220 1.220 Output Impedance RMS Noise Voltage 10Hz ≤ f ≤ 10kHz Temperature Coefficient TA = Full Range Turn-On Settling 0.1% of VOUT Operating Current (Note 3) 1.235 1.250 0.6 2 5 Units 1.235 1.250 V 0.6 2 Ω µVrms 5 50 100 15 ppm/°C µsec 15 0.05 4 0.05 4 mA Note1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Note 2: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at TA = TJ = 25°C. Note 3: Optimum performance is obtained at currents below 500µA. TYPICAL APPLICATIONS Precision 1µ µ A to 1mA Current Sources Shunt Regulator AMS124 VS 12V AMS124 RS IQ + IL AMS124 R1 20k IL VR 2 IQ - R1 20k 8 1/2 LMC6062 3 4 + IOUT* 2 - 8 1/2 LMC6062 3 4 + 1 R2 IOUT* -1.0V TO -12V 1 R2 1.0V TO 12V -15V IOUT=1.2V/R2 Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS124 TYPICAL PERFORMANCE CHARACTERISTICS Reverse Characteristics and Minimum Operating Current Temperature Drift for Different Average Temperature Coefficient I R = 150 µ A VR CHANGE (%) +0.3 +0.2 +12ppm/° C +0.1 0 -0.1 -0.2 -22ppm/° C -0.3 -51ppm/° C -0.4 -0.5 -40 -20 1000 80 800 60 40 20 100 1 10 1k 10k 100 FREQUENCY (Hz) 100k Ouput Impedance vs Frequency 100 C L= 0 C L= 1 µF TANTALUM 1 IMPEDANCE (Ω) IMPEDANCE (Ω) 2.0 1k IR= 1mA TJ =25° C, ∆I R= 0.1I R 10 400 0 0.4 1.2 1.6 0.8 REVERSE VOLTAGE (V) 0 Ouput Impedance vs Frequency 1k 600 200 0 0 20 40 60 80 TEMPERATURE ( ° C) IR = 200 µ A TJ =25° C TJ =25° C REVERSE CURRENT (µA) +0.4 Noise Voltage vs Frequency 100 NOISE (mV/√Hz) +0.5 I R= 150µA TJ =25° C, ∆I R= 0.1I R C L= 0 100 C L= 1µF TANTALUM 10 1 XC L XC L 0.1 0.1 100 1k 10k 100k FREQUENCY (Hz) Advanced Monolithic Systems, Inc. 1M 100 1k 10k 100k FREQUENCY (Hz) 1M 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 AMS124 PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted. 3 LEAD SOT-23 PLASTIC PACKAGE (M) 0.110-0.120 (2.794-3.048) 0.015-0.017 (0.381-0.432) 0.083-0.098 (2.108-2.489) 0.047-0.055 (1.194-1.397) 0.035-0.040 (0.889-1.016) 0.018-0.024 (0.457-0.610) 10° NOM 0.035-0.041 (0.089-1.041) 0.0034-0.0050 (0.086-0.127) 0.0005-0.0040 (0.013-0.102) 0.070-0.080 (1.778-2.032) 10° NOM 0.018-0.024 (0.457-0.610) (SOT-23 ) AMS DRW# 051991 Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140