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 Advanced Monolithic Systems
FEATURES
* Low Temperature Coefficient * Low Output Noise * Operating Current 50A to 4mA * Low Dynamic Impedance * Tight Output Voltage Tolerance * Available in the sub-miniature SOT-23 Package
AMS124
MICROPOWER SHUNT VOLTAGE REFERENCE
RoHS compliant
APPLICATIONS
* 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 50A 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 -40C to 85C 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 +85C -40 to +85C
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.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS124
ABSOLUTE MAXIMUM RATINGS (Note 1)
Reverse Current Forward Current Lead Temperature (25 sec) 5mA 10mA 265C Storage temperature Internal Power Dissipation (PD) SOT-23 Package Thermal Resistance (JA) SOT-23 Package -65C to +150C 0.28W 410C/W
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at IR =500 A and TA = +25C unless otherwise specified. Parameter
Output Voltage Output Impedance RMS Noise Voltage Temperature Coefficient Turn-On Settling Operating Current 10Hz f 10kHz TA = Full Range 0.1% of VOUT (Note 3) 0.05 15 4 0.05
Conditions
AMS124A Min. Typ. Max.
1.220 1.235 0.6 5 50 1.250 2
AMS124B Min. Typ. Max.
1.220 1.235 0.6 5 100 15 4 1.250 2
Units
V Vrms ppm/C sec 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 = 25C. Note 3: Optimum performance is obtained at currents below 500A.
TYPICAL APPLICATIONS
Shunt Regulator
VS
AMS124
Precision 1A to 1mA Current Sources
12V AMS124
RS VR AMS124
IQ + IL IL IQ
3 IOUT* -1.0V TO -12V R1 20k 2 -
8 1/2 LMC6062 1 4
R1 20k
2
+
8 1/2 LMC6062 3 4 + IOUT* 1.0V TO 12V
-
1
R2
R2
-15V
IOUT=1.2V/R2
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS124
TYPICAL PERFORMANCE CHARACTERISTICS
Temperature Drift for Different Average Temperature Coefficient +0.5 +0.4 +0.3 VR CHANGE (%) +0.2 +0.1 0 -0.1 -0.2 -0.3
-51ppm/ C -22ppm/ C +12ppm/ C IR = 150 A
Reverse Characteristics and Minimum Operating Current 100
TJ =25 C
Noise Voltage vs Frequency 1000
IR = 200 A TJ =25 C
REVERSE CURRENT ( A)
80 60 40 20 0 NOISE (mV/Hz) 0.4 1.2 1.6 0.8 REVERSE VOLTAGE (V)
800 600 400 200 0 0 2.0 1 10 1k 10k 100 FREQUENCY (Hz) 100k
-0.4 -0.5 -40 -20
0 20 40 60 80 TEMPERATURE ( C)
100
Ouput Impedance vs Frequency 1k
IR= 1mA TJ =25 C, IR= 0.1IR
Ouput Impedance vs Frequency 1k
IR= 150A TJ =25 C, IR= 0.1IR CL= 0
IMPEDANCE ()
CL= 0
IMPEDANCE ()
100
100
10
CL= 1F TANTALUM
10
CL= 1F TANTALUM
1
XCL
1
XCL
0.1 100 1k 10k 100k FREQUENCY (Hz) 1M
0.1 100 1k 10k 100k FREQUENCY (Hz) 1M
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
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.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723


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